nuffield physics: guide to apparatus - National STEM Centre

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Nuffield Physics Guide to Apparatus 22 70 Demonstration meters Quantity required: 2 per school. • '• ' It is important that demonstration meters are available in schools and'clearly visible to the whole class. Some schools will already have such meters and a range of shunts and bobbins, but the type with changeable scales is particularly recommended as it is then clear to the pupils precisely what is being read. See also the note on electrical measuring instruments in Section C, page 142. See illustration on page 135. : 71 Dials for demonstration meters These dials are for use with those demonstration meters (item 70) which require interchangeable scales. One dial for each of the following ranges is needed : two dials of 71/4 and 71/2 are needed in years IV and V respectively. . .-•• 71/1 d.c. dial: lamp 71/2 d.c. dial: 5amp • . • 71/3 d.c. dial: 5 volts 71/4 d.c. dial: 2-5-0-2-5mA 71/5 a.c. dial: 5 volts 71/6 a.c. dial: 15 volts 71/7 a.c. dial: 5amp 71/8 a.c. dial: lamp 71/9 a.c. dial: 300 volts 71/10 d.c. dial: 15 volts " 71/11 d.c. dial: 300 volts 71/12 d.c. dial: 100mA 72 Lamps (12V, 24W) Quantity required: 16 per school. These are S.B.C. car headlamp bulbs. 73 Lamps (12V, 36W) 1 e Quantity required: 8 per class. These are S.B.C. car headlamp bulbs.
Section A Details of apparatus required 23 74 Lampholders (S.B.C.) on bases Quantity required: 16 per school. ' ''. '• •••••''•• '•'•'• '•:'••'?•;';• •••.. These lampholders take the S.B.C. lamps, items 72 and 73 above. They should be mounted on wood blocks and have 4mm terminal sockets. 75 Immersion heaters - / >, Quantity required: ' • . ; 8 per class, enabling pupils to work in groups of four. These special heaters are 12V, 50 watt and fit into the aluminium blocks, item 77. They must be such that they can be used for heating water as well as for heating the aluminium blocks and be capable of operation in air. 76 Aluminium containers Quantity required: 8 per class, enabling pupils to work in groups of four. These containers should be domestic cooking vessels without lids, and should have small side handles, not one long handle. They must be wide so that a thermometer in a litre of water will slant at a shallow angle, enabling it to be read in the water. A suitable size is 6in wide and 4in deep, which will take a litre of water. 77 Aluminium blocks Quantity required: 8 per class, enabling pupils to work in groups of four. These blocks must weigh 1 kg and be drilled to accept an immersion heater (item 75) and a thermometer (item 542). 78 Variable a.c. supply ('Variac' type) Quantity required: 1 per school. The L.T. variable voltage supply (item 59) provides a continuously variable voltage supply 0-25 volts a.c. and d.c., at up to 8 amperes. This is satisfactory for all the recommended experiments, but in addition a variable voltage a.c. supply from 0 to 270 volts is an asset in any school laboratory. It should provide at least 2 amperes; the Samp type is more versatile but costs over twice as much.
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Apparatus illustrations
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Lever kit (item 5) Microbalance kit
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Evesham pressure apparatus (item 41
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Whitley Bay smoke cells (item 29) B
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Forces demonstration box (item 63),
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Dynamics trolley (item 106/1), with
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Water circuit board (item 89) with
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Skelton variable focus eye (item 1
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Expansion cloud chamber (item 18) S
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Fine beam tube (item 61), and base
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12-volt battery (item 1 76), A.C. g
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item no. 29 31/1 31/2 32 35 36 40 4
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item no. 71/8 71/11 72 73 74 78 84
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Index
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Index 192 505 Bosses 61 109 Boyle's
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Index 194 155 Electric motors, smal
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Index • 196 177 Lamps (12V, 6W) 5
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Index 198 111 Prisms, 60° 32 550 P
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Index 200 108/4 Tickertape (gummed)
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Organizer Professor E M Rogers Asso
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