Part II - FURNITURE FOR STORAGE OF EQUIPMENT
96 Thermometer Non-mercury, with reinforced bulb and permanent graduations
(a) -10oC to 110oC x 1oC , 305 mm length. 12
(b) -10oC to 110oC x 1oC , 155 mm length. 12
(c) -10oC to 300oC x 1oC , 305 mm length. 12
97 Thin layer chromatography plate Flexible silica gel plates, layer 250μm, aluminium backing, without fluorescent indicator, 20 cm x 20 cm.
1 pack
98 Tile White ceramic, 105 x 105 mm. 45
99 Tongs, crucible Stainless steel, straight with flattened hinge, 200 mm. 24
100 T-piece @ Glass, 6 mm bore. 12
101 Tripod stand Triangular top, cast iron, with splayed steel legs, 150 x 210 mm (length of side x height). 24 102 Trolley Apparatus, four wheels, stainless steel frame, stainless steel trays of size about 760 x 460
mm, height of top tray about 900 mm, height between trays about 350 mm.
4
103 Trough Plastic, 350 x 150 mm (diameter x depth). 2
104 Tube, capillary @ For melting point determination, open at both ends, 100 x 1.8 to 2.0 mm (length x diameter).
Pack of 100.
10 packs 105 Tubing, Bunsen / Teclu burner @ Rubber, with indication of Approval Mark & Expiry Date of Service Life on hose surface.
About 9 mm internal bore, not more than 2m length, for either town gas or liquefied petroleum gas depending on the supplied.
25
106 Tubing, rubber @ (a) Normal wall, 3 x 1.5 mm (bore x wall thickness). 10m
(b) Normal wall, 5 x 1.5 mm (bore x wall thickness). 10m
(c) Normal wall, 8 x 1.5 mm (bore x wall thickness). 10m
107 U-tube @ Glass, 125 x 15 mm (height x external diameter). 12
108 Wash bottle White translucent, flexible, with screw cap and bent tube, polyethene, 250 mL capacity. 45
109 Watch glass @ Ground edge, 100 - 120 mm diameter. 24
110 Water bath (a) Bath Unit. Unstirred thermostatic bath. Made of stainless steel. Capacity 22 L. Has a sheathed immersion element incorporating a safety cut-out. Heater power 1,500 W.
Temperature range ambient to 100oC, sensitivity ±0.3oC, uniformity ±0.1oC. The bath has an illuminated ON/OFF switch and a heater indicator lamp. With stainless steel lid bearing an insulated handle.
1
(b) Stainless steel test tube racks for holding test tubes of 24 mm diameter. 2
111 Wire gauze ## Ceramic centred, asbestos free, 150 x 150 mm. 24
112 Y-piece @ Glass, 6 mm bore. 5
CHEMICALS (The following items are consumables)
113 Agar 100g
114 Aluminum foil 250 g
115 Aluminum oxide 500 g
116 Aluminum sulphate 500 g
117 Ammonia solution, 0.880 2.5 L
118 Ammonium carbonate 500 g
119 Ammonium chloride 1 kg
120 Ammonium iron(II) sulphate 500 g
Item No Item Description Quantity
121 Ammonium iron(III) sulphate 500 g
122 Ammonium sulphate 500 g
123 Ammonium vanadate(V) 100 g
124 Barium chloride 500 g
125 Barium nitrate 250g
126 Bromine, 1 mL ampoules 2 ampoules
127 Buffer solution, pH 4 1 L
128 Buffer solution, pH 7 1 L
159 Hexane-1,6-diamine 25 g
160 Hexanedioyl dichloride 25 mL
161 Hydrochloric acid, conc. 2.5 L
162 Hydrogen peroxide, 6% 250 mL
163 Iodine 100 g
164 Iron(II) sulphate 100 g
165 Iron(II) sulphide 250 g
166 Iron(III) chloride 500 g
167 Iron(III) nitrate 250 g
168 Iron(III) oxide, powder 500 g
169 Iron(III) sulphate 500 g
170 Iron, fine clean filings 500 g
171 Iron, wire, 30 s.w.g. 1 reel of 28g
172 Lead, foil 500 g
173 Lead(II) bromide 250 g
174 Lead(II) chloride 100 g
175 Lead(II) nitrate 500 g
176 Lead(II) oxide 250 g
177 Lithium chloride 50 g
178 Litmus, granulated 50 g
179 Magnesium, ribbon 2 reels of 25g
180 Magnesium carbonate 500 g
181 Magnesium sulphate, anhydrous 500 g
182 Magnesium sulphate-7-water 500 g
183 Manganese(II) chloride 250 g
184 Manganese(IV) oxide 500 g
185 Manganese(II) sulphate-4-water 500g
186 Methyl orange 25 g
187 Methyl red 25 g
188 Nickel, plate 500 g
189 Nickel(II) chloride 250 g
190 Nickel(II) sulphate 250 g
191 Nitric acid, conc. 2.5 L
192 Paraffin oil 500 mL
193 Phenol red 5 g
194 Phenolphthalein 25 g
195 Phosphoric(V) acid 500 mL
196 Phosphorus(V) oxide 100 g
197 Potassium bromate 250 g
198 Potassium bromide 250 g
199 Potassium carbonate 500 g
200 Potassium chloride 250 g
201 Potassium chromate(VI) 100 g
202 Potassium dichromate(VI) 500 g
203 Potassium hexacyanoferrate(III) 250 g
204 Potassium hydrogencarbonate 250 g
205 Potassium hydroxide, pellets 500 g
206 Potassium iodate(V) 250 g
207 Potassium iodide 250 g
208 Potassium manganate(VII) 250 g
209 Potassium nitrate 500 g
Item No Item Description Quantity
210 Potassium sulphate 500 g
211 Potassium thiocyanate 250 g
212 Propan-1,2,3-triol 500 mL
213 Propanone 1 L
214 Pumice stone 200 g
215 Rocksil 250 g
216 Silica gel, pore size 60 100g
217 Silicon(IV) oxide 500
218 Silver nitrate 50 g
219 Silver oxide 25 g
220 Soda lime 500 g
221 Sodium 25g
222 Sodium bromide 250 g
223 Sodium carbonate, anhydrous 500g
224 Sodium chloride, fine 2 kg
225 Sodium citrate 100 g
226 Sodium hydrogencarbonate 500 g
227 Sodium hydrogensulphite 500 g
228 Sodium hydroxide, pellets 1 kg
229 Sodium iodide 250 g
230 Sodium nitrate 250 g
231 Sodium nitrite 250 g
232 Sodium sulphate 500 g
233 Sodium sulphite 250 g
234 Sodium thiosulphate 500 g
235 Starch 250 g
236 Strontium chloride 100 g
237 Strontium nitrate 100 g
238 Sucrose 250 g
239 Sulphur, crushed 250g
240 Sulphuric acid, conc. 2.5 L
241 Test paper, blue litmus (pkt/200) 3 packs
242 Test paper, cobalt chloride (pkt/200) 1 pack
243 Test paper, lead ethanoate (pkt/200) 1 pack
244 Test paper, neutral litmus (pkt/200) 3 packs
245 Test paper, pH, range 1-14 (pkt/200) 12 packs
246 Test paper, red litmus (pkt/200) 3 packs
247 Test paper, starch iodide (pkt/200) 1 pack
248 Tin, foil 100 g
249 Tin(II) chloride 100 g
250 Universal indicator 100 mL
251 Urea 500 g
252 Vaseline 100 g
253 Wooden splints (pkt/1000) 1 pack
254 Zinc carbonate 250 g
255 Zinc chloride 250 g
256 Zinc nitrate 100 g
257 Zinc sulphate-7-water 500 g
258 Zinc, foil 250 g
259 Zinc, granulated 500g
FURNITURE
260 Box, first-aid Single door, approx. dimensions of 280 x 280 x 110 mm (width x depth x height) 1
261 Stool Wooden or plastic seat, approx. dimensions of 300 mm x 300 mm, 530 mm height 45
262 Chemical waste storage cupboard Overall dimension 910 mm (W) x 460 mm (D) x 1830 mm (H) Steel, double door, fitted with 3-point locking espagnolette bolt, controlled by 6-level lock with one adjustable shelf. With words "CHEMICAL WASTES 化學廢物" (not less than 60 mm in height) printed clearly and boldly in red on a white background on the left door. 4 ventilation holes on each side. Rust proof finish.
2
263 Stainless steel spill catcher tray Overall dimension 380 mm (W) x 145 mm (D) x 380 mm (H). 6
264 Heavy-duty plastic spill catcher tray Overall dimension 380 mm (W) x 362 (D) x 380 mm (H). 6
Total cost for Subject 505,000
This list is for reference only. The items and the quantities to be purchased are subject to the types of practical activities planned and the size of the classes.
Potassium manganate(VII) is regarded as one of the controlled chemicals under the Control of Chemicals Ordinance. Schools wishing to acquire potassium manganate(VII) for experimental purpose must apply for a Storage Approval from Customs and Excise Department (Tel. 2541 4383). For more information about the controlled chemicals, please refer to the website http://www.customs.gov.hk/en/trade_facilitation/chemicals/index.html2,4-Dinitrophenylhydrazine solid should be kept damp or 'wetted to minimise the risk of udst/air explosion. Stand the bottle of damp solid inside a larger container that also contains a little tap water in the bottom (~ 10mm depth). Label both the inner and outer containers. If solid may have become dry, do NOT attempt to open the bottle. Schools should defer the acquisition of this item until they are required for use in experiments.
@ Consumable items
# The asbestos-free requirement should be clearly specified when purchasing the item. As a safeguarding measure, schools may consider requesting suppliers to provide evidence (e.g.
laboratory testing report) authenticating their products are free of asbestos. School may also consider using other alternatives e.g. stainless steel bench mat if suppliers fail to authenticate their products are free of asbestos.
## The asbestos-free requirement should be clearly specified when purchasing the item. As a safeguarding measure, schools may consider requesting suppliers to provide evidence (e.g.
laboratory testing report) authenticating their products are free of asbestos. School may also consider using other alternatives e.g. wire gauze without the ceramic center if suppliers fail to authenticate their products are free of asbestos.
### Refrigerator
(1) Double door, with freezer and chiller compartments.
(2) Storage Capacity: net overall capacity of about 180 - 220 litres.
(3) Dimensions: not exceed 1,600 mm in height.
(4) Defrosting: frost-free.
(5) Energy rating: Two stars (2*) as a minimum.
(6) Freezer compartment: not higher than -12oC.
(7) Chiller compartment: not higher than 4oC.
(8) Ice tray of suitable design: should be provided.
(9) Refrigerant: non-toxic, non-explosive and odourless, preferably with low Global Warming Potential.
Remarks: The refrigerator should not be used to store volatile flammable liquids and alkali metel (e.g. sodium).
*Specifications of Centralized low voltage power supply unit
This equipment is designed to provide a source of low voltage a.c. or d.c. Power supplies simultaneously to distribution points with output controlled from the unit; for general use in school laboratories with provision for charging secondary batteries. A single phase a.c. supply is taken from an outlet with fused plug and is connected to the double pole isolator which disconnects the supply completely from all components immediately when the front panel is opened. From the isolator, power is taken through the input circuit breaker to the variable ratio auto-transformer. The input circuit is protected against both surge or steady overload by the input circuit breaker. Input current and voltage are indicated by the input ammeter and input voltmeter at the top of the front panel. The output from the variable ratio auto-transformer is taken to the primary of a fixed ratio, step down, double wound, main transformer. The secondary of this main transformer is taken to the rotary selector switch. To provide a.c. sources, the secondary output is fed via the output ammeter, output voltmeter and output circuit breaker to the output terminals. The output circuit breaker designed to withstand heavy current arcs safeguards the output circuit. To provide d.c. sources, the low voltage alternating current is fed into the selenium cell full wave bridge connected rectifier and then via the output meters and output circuit breaker to the output terminals. The d.c. output is unsmoothed and the polarity is indicated by terminal colour. All the measuring instruments are of the moving iron type. The input and output circuit breakers are both of the magnetic terminal release type and are adjusted to trip at 5 and 50 A respectively. For inspection purposes, the front panel is hinged at the bottom to allow it to be opened through 140o. The internal wiring is colour coded, with green for a.c. and red/black for d.c. When opening, the supply is automatically disconnected making the wiring "dead" and perfectly safe to touch.
For laboratory use
The output from the unit is taken via a ring main circuit to at most 13 distribution points in the laboratory. The output voltage and/or current may be kept constant or varied by adjustment of the auto-transformer.
Maximum outputs are:
0 - 14 V at 40 A a.c. or d.c.
14 - 18 V at 32 A a.c. or d.c.
For battery charging, the cells should be connected in series with the positive and negative terminals connected to the output terminals of like polarity. The maximum number of 2 V cells that can be charged is 6 and the maximum charging current advised by the battery manufacturer should not be exceeded. The unit is rated at 580 VA. Overall dimensions approximately 540 x 310 x 740 mm (length x width x height). For use on 220 - 240 V, 50 Hz, single phase, a.c. supplies. Bonded to earth through 3 core supply cable and 3 rectangular pin appropriately fused B.S.S. plug.
Reference List of Furniture and Equipment for Secondary School
Subject : SS Physics
Item No Description Quantity
EQUIPMENT
1 3 cm wave apparatus 1
Comprises:
(a) 3 cm wave transmitter
- Contains a Gunn diode oscillator operating at a frequency of about 10 GHz (thus, 3 cm wavelength). Radiated output is plane polarized vertically.
- Should have some means for protection against accidental reversal of input polarity and overloads and is fitted with a high-gain horn radiator.
- Output power is about 30 mW for an 8 to 12V a.c. / d.c.
- Cylindrical case is 83 mm diameter x 70 mm long approx. Total length (including horn) is 225 mm approx.
(b) 3 cm wave receiver
- Construction similar to that of the transmitter.
- Consists of a crystal diode to receive electromagnetic radiation of wavelength approximately 3 cm, output from 4 mm sockets can be monitored visibly on a meter or audibly using an amplifier.
(c) Diode probe receiver
- Consists of a crystal diode of the same type as that used in the receiver in (b) above.
- The diode is mounted on a short, vertical, non-metallic rod to make detections in small positional locations.
- Output from 4 mm sockets can be monitored visibly on a meter or audibly using an amplifier.
- Dimensions 75 x 50 x 135 mm high approx.
(d) Loudspeaker amplifier unit
- A general purpose unit consisting of a transistorized 9 V amplifier housed in a plastic box.
- Speaker approximately 64 mm diameter behind aluminum grill with volume control, input matching control, connection sockets and two-position switch for internal speaker / signal output.
- Signal output sockets internally protected against overload.
(e) Hollow plastic cylindrical plano-convex lens
- For EM wave's refraction experiments.
- Dimensions: 180 mm x 210 mm approx. (diameter x height)
- To be filled with paraffin oil.
(f) Hollow plastic prism (45o 90o 45o)
- For EM wave's refraction experiments.
- Dimensions: 210 mm x 210 mm x 300 mm approx.
- To be filled with paraffin oil.
(g) Set of plates Comprising :
- 2 aluminum plates 60 x 300 mm approx.
- 1 aluminum plate 200 x 300 mm approx.
- 1 plastic plate 200 x 300 mm approx.
- Each of the plates mounted on supporting feet.
- 1 polarisation grille 200 x 200 mm approx. mounted on supporting rod.
(h) Paraffin oil @
Mainly used for the filling up of the plastic lens and prism in refraction experiments.
2 Alpha particle scattering analogue 1
Comprises:
- a moulded plastic ramp rising to approximately 100 mm in height.
- a moulded plastic model nucleus about 280 mm
- diameter with an accurately calculated curved surface rising to a height of 60 mm approximately.
- two steel balls approximately 12.5 mm diameter.
3 Atomic model 1
A lattice model constructed from spheres interconnected by weak open wound spiral springs providing a very flexible arrangement.
4 Balance, spring (dial type) 1
- A strong and tension balance with large scale, which can be used to demonstrate weightlessness during free fall.
- With a large dial surface at least 150 mm diameter.
- Range: 0 - 100 N x 0.5 N 5 Balance, spring (flat form)
- In flat form with metal case.
- With suspension ring and load hook.
- With zero adjustment.
(a) Range: 0 - 10 N x 0.1 N 10
(b) Range: 0 - 20 N x 0.5 N 10
6 Bicycle dynamo assembly 1
- Bicycle dynamo mounted on wooden base and provided with two sets of gears driven by hand crank.
- Two 4 mm socket terminals are provided for the dynamo output, connected in parallel with a lamp holder with a 1.25V, 0.25 A (MES) bulb.
7 Binoculars 10
- Used to view celestial objects in the night sky.
- Magnification should be 10x or above.
- Diameter of the objective lens should be 50 mm or above.
8 Bourdon gauge 10
- Metal cased pressure gauge mounted on a base.
- With a circular dial of 100 mm diameter approx.
- With connector for 6.5 mm bore heavy wall flexible tubing.
- Range: 0 to 130 kPa absolute pressure approx.
9 Boyle's Law apparatus and footpump
Boyle's Law digital apparatus without pump is an alternative.
(a) Boyle's Law apparatus 1
- With a vertical wide bore glass tube mounted vertically in front of a scale from 0 to 60 mL approximately. Air is confined in the tube by a coloured oil contained in a cylindrical metal oil reservoir, which is fitted with a Bourdon gauge calibrated 0 to 350 kPa approximately.
- A valve tap is fitted to the air inlet tube from the foot-pump.
- Mounted on wood base 270 x 150 mm approximately.
- Supplied complete with a bottle of oil (250 mL) and a plastic safety screen fixed in front of the glass tube mount.
(b) Footpump and adapter 1
- Used with the Bourdon gauge or the Boyle's Law apparatus.
- This foot pump is a standard car tyre's pump with an integral pressure gauge calibrated from 0 to 400 kPa.
- With non-return valve and rubber hose to connect to the Bourdon gauge or the Boyle's Law apparatus.
10 Brownian movement smoke cell 1
- A short cylindrical glasscell, closed by a cover glass, is held vertically in a transparent plastic box with sliding lid.
- Illumination is by a line filament lamp with a cylindrical glass
- Fitted with battery holder and 4 mm socket terminals and connection to 3V supply.
11 Carbon model kit 5 kits
A model kit which can be used to assemble different appearances of carbon: Diamond, Graphite and Fullerene (C60).
- Consists of at least 78 spheres & 128 rods for a diamond model.
- Consists of at least 67 spheres & 105 rods for a graphite model.
- Consists of at least 60 spheres & 90 rods for a Fullerene (C60) model.
12 Celestial globe 1
Approx. 400 mm in diameter. Demonstrate the relationships of the earth, stars, planets and galaxies. With an outer sphere to indicate the constellations and stars, an earth globe mounted within the outer sphere and a movable sun. Complete with the meridian ring and horizontal mounting. Manuals included.
13 Cell Holder 10
A plastic box with cover to accommodate four 1.5V D-size dry cells in series. Fitted with terminals to accept 4 mm plug leads or screw down onto bare wire. Can provide 1.5V, 3V, 4.5V or 6V e.m.f. values.
14 Centralized low voltage power supply unit1 1
15 Coils, Transformer
(a) Coil (120 + 120 turns) 4
Of copper wire on plastic former, approx. 100 x 55 x 35 mm overall. With hole approx. 24 x 14 mm to accommodate C-core in (b) and three 4 mm sockets for 0-, 120- and 240- turn connections. Rated at 1 A.
(b) Double C-core with clips 10 sets
Each core is laminated from low loss iron strip and is cut across the middle to produce two equal C's. A strong spring clip is provided to hold the two halves together.
16 Colour filter set 1 set
A set of eight sheets of acetate filter 540 x 300 mm approx. One each of blue, cyan, green, yellow, magneta, red, ruby.
17 Compass, plotting 40
With two clear glass faces, needle pivoted between top and bottom glass plates, without dial, 20 mm diameter approximately.
18 Convection in air apparatus 1
It comprises a metal box sized 230 x 75 x 75 mm approximately with a sliding glass front and two detachable glass chimneys 150 x 50 mm diameter approx.
A candle holder is mounted in the box under each chimney.
A short length of candle is inserted into one of the holders and ignited. Once the sliding front of the box is closed, a convection flow is produced which travels down the unheated chimney, across the box, up the heated chimney, and may be shown by use of smoke from a smoldering taper or string held close to the top of the unheated chimney.
19 Current balance kit 2 kits
Comprises:
- one wide and one narrow 1.6 mm diameter copper wire current balance. Dimensions approximately 320 x 250 mm and 320 x 35 mm respectively. The ends are joined by a plastic sleeve through which a brass pointer is fitted and each balance carries a coiled wire rider.
- a mounted index.
- two magnets with pole face approximately 50 x 19 x 4.5 mm thick - one mild steel yoke
- one stand comprises two plastic supports approximately 60 x 45 x 5 mm mounted 210 mm apart at ends of aluminum rod 5 mm diameter and together carrying three 8 mm square section brass fulcra at appropriate separations for wide and narrow current balances.
20 Data logger interface 5
(a) Hardware
- The interface can log data from appropriate sensors to a suitable device (such as notebook computer/tablet)
(b) Software 5
- Can be run on a suitable operating system
- Can display and analyze data from appropriate sensors 21 Data logger sensors
The sensors should be fully compatible with the interface above (not necessary to purchase extra sensor(s) if the above interface has the corresponding built-in sensor(s)).
(a) Current sensor 5
Can be used to measure current from -1.0 to +1.0 A in an electric circuit. The inputs should be protected against overloads by some practical ways.
Current range: -1.0 A to +1.0 A Current resolution: better than 1 mA Sample rate: not less than 1,000Hz
(b) Force sensor 5
Can be used to measure force from -50 N to +50 N with a resolution of ±0.05 N (or better).
(c) Infrared sensor 5
Can be used to measure infrared radiation ranging from 600 nm to 40,000 nm and the intensity is displayed in Watt /meter2.
(d) Light sensor 5
Can be used to measure light intensity and data is displayed in lux (unit of illuminance) which is a measure of luminous flux per unit area.
(e) Motion sensor 5
Can be used to measure position, velocity and acceleration of objects within a range from 0.2 m to 8.0 m approx.
(f) Photogate sensor 5
Consists of a light source and a light detecting device.
Can be used to monitor motion of moving objects of tiny size (e.g. a thin cardboard paper).
Photogate width: approx. 7 cm Spatial resolution: 1 mm or better Timing resolution: 0.1 ms or better
(g) Pressure sensor, Absolute 5
Can be used to measure the absolute pressure of a gas in a container up to 700 kPa with a resolution of ± 0.1 kPa. Should include a syringe and a quick connect tubing for investigating the Gas Laws.
(h) Rotary motion sensor 5
Can be used to measure rotary motion with a resolution of 0.09o or better.
(i) Sound sensor 5
Can be used to measure both sound level (in dB) and sound intensity (in W/m2).
Max sample rate: 20 Hz or higher.
Accuracy: ±3 dB at 100 dB and 1000 Hz Resolution: 0.1 dB or better
(j) Temperature sensor 5
Stainless steel temperature sensor which offers fast response and large range of temperature measurement.
Range: -35 oC to +135 oC or better Accuracy: ±0.5 oC or better Resolution: 0.1 oC or better
(k) Ultraviolet sensor 5
Can be used to detect and measure UVA (i.e. from 320 nm to 400 nm).
(l) Voltage sensor 5
Can be used to measure voltage from -10 V to +10 V in an electric circuit. The inputs should be protected by some practical ways.
Voltage range: -10V to +10V or better
Item No Description Quantity
Voltage resolution: 10 mV or better Sample rate: not less than 1000 Hz
(m) Acceleration sensor (3-axis) and Altimeter 5
Can be used to measure and present acceleration in x, y and z axes, resultant acceleration as well as altitude (in metres).
Range of acceleration: ±10 g or better Resolution of acceleration: ±0.01 g or better Range of altitude: up to 7 km above sea level Resolution of altitude: ±50 cm or better
(n) Vest 2
Keeps the data logger and sensors secure during outdoor experiments. The experimenter wears the vest and his motion can be recorded by the sensors and data logger in the pockets of the vest.
22 Demonstration meter 2
Accepts large interchangeable plastic scales to enable the use as a demonstration a.c./d.c. ammeter or voltmeter.
A magnetically damped, spring-controlled moving coil movement with a pointer, housed in case with transparent front and rear panels to enable all working parts to be clearly seen.
With a pair of 4 mm socket terminals and a centre zero adjustment control.
Comprises:
(a) Interscale demonstration meter 2
Sensitivity of 300 A f.s.d. at d.c.100 mV
(b) Current and Voltage range scales 1 each
- d.c. current, range 2.5-0-2.5 mA - d.c. current, range 0-10 mA - d.c. current, range 0-100 mA - d.c. current, range 0-1 A - d.c. current, range 0-10 A - d.c. voltage, range 0-1 V - d.c. voltage, range 0-15 V - d.c. voltage, range 5-0-5 V - a.c. current, range 0-10 mA - a.c. current, range 0-1 A - a.c. current, range 0-10 A - a.c. voltage, range 0-15 V - a.c. voltage, range 0-300 V
23 Dice 100
Used to study the radioactive decay law by performing an analogue dice throwing simulation.
With 6 faces, approx. 14 mm x 14 mm x 14 mm 24 Diffraction grating
Embedded in 50 x 50 mm slide or film mounts.
(a) 300 lines per mm. 10
(b) 600 lines per mm. 10
25 Ear model 1 set
- An enlarged model of the ear showing pinna, auditory canal, tympanic membrane, incus, malleus, stapes, cochlea and semicircular canals isolated from surrounding tissues.
- Mounted on a stand so that effect of sound wave vibrations can be demonstrated.
- Approximate dimension: 280 mm x 210 mm x 140 mm
26 Eddy current kit 1 set
For providing a qualitative practical demonstration of Lenz's law.
Comprises:
- a copper tube (about 320 mm x 15 mm) together with a pair of cylindrical 'plugs' (the plugs are identical in appearance and mass but one is plain steel and one is a powerful neodymium plug).
- a pair of plastic caps to provide self contained storage.
27 Electric field Kit 1 set
To give visual demonstration of electric fields Comprises:
(a) Electric field apparatus Comprises:
- 1 transparent plastic base supports a dish 90 mm diameter approx.
- two 4 mm socket terminals, mounted on insulating pillars 30 mm high approx.
- 2 wire point electrodes - 1 ring electrode - 2 line electrodes
(b) Castor oil@ 2 litres
(c) Semolina powder 40 grams
28 Extra high tension (EHT) power supply unit 1
Outputs : 0 to 5 kV d.c. short circuit current of 3 mA 0 to 5 kV d.c. short circuit current of 60 A through 50 MΩ resistor.
6 V a.c at approx. 2 A (for filament)
- The 50 MΩ safety resistance is built in and can be brought into use as required, and for additional safety measure there is 1 MΩ resistance between the voltage doubler capacitors and the metered + ve and -ve sockets.
- Enclosed in robust metal case with pilot light and mains switch.
- For use on 220 - 240 V a.c. 50 Hz, single phase supplies.
Bonded to earth through 3 core supply cable and 3 rectangular pin appropriately fused B.S.S. plug.
29 Fibre optics communication kit 1 kit
The system comprises a transmitter, a receiver and a length of optical fibre to demonstrate long distance communication.
Specifications are given as below:
(a) Transmitter:
1. Light source - High intensity red LED;
2. Modulation - internal or external;
3. Ext Modulation - input 0 to 5V approximately;
4. Ext Modulation frequency range - d.c. to greater than 300Hz approximately;
(b) Receiver:
1. Input - solid state photo-detector;
2. Output - high speed digital output, 0 to 5V from below 20 Hz to above 300 kHz approximately;
Other requirements;
1. Optical termination - by simple push in connection for 1 mm diameter optical fibre;
2. Electrical termination - 4 mm sockets;
3. Power requirements - 5 to 6V dc;
4. Optical fibre - double layer polymer fibre of 1 mm nominal diameter.
30 Flat solenoid 2
- Consists of approximately 250 turns of enamelled copper wire, wound on wood and plastic former. To be used with the current balance kit.
- Overall dimensions approximately 300 x 260 x 30 mm.
- Connections are made via 4 mm sockets.