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Wheatstone Bridge, Four Gap (P-8005)
This substantial four gaps bridge has, plated brass strips mounted on a wood base. Plated brass terminals with 4mm sockets are provided to reduce unwanted resistance to a minimum and the gaps are closed by removable plated brass strips which are held in position by the terminals. The 0.56mm constantan wire is stretched along the top of a metre scale subdivided into millimeters and figured every centimeter. The ends of the wire are securely clamped to the terminating strips to reduce end errors to a negligible level. Supplied with jockey. SIZE: 1.13m x 81mm x 50mm approx.
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Potentiometer, Single Wire, 1 Meter (P-8015)
Comprises a 0.56mm constantan wire stretched along a meter scale mounted on wooden base, clamped to stout, plated brass end plates. The terminating strips are provided with 4mm socket terminals, supplied with jockey.
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Rheostat, Single Tube, Open Type (P-8025)
They are wound with heavily oxidized resistance wire upon a porcelain tube. The tube is carried upon robust bakelite or aluminium posts and the heavy duty sliding contact is of the phosphor bronze, nickle plated for corrosion resistance, 4mm socket terminals are fitted, allowing for rheostat or potentiometer connection. Resistance Max. Current Tube Size in Ohms in Amps in mm A 1600 0.3 200 x 43 B 600 0.6 200 x 43 C 300 0.9 200 x 43 D 135 1.4 200 x 43 E 55 2.3 200 x 43 F 16 4 200 x 43 G 8.5 5 200 x 43 H 2.5 9 200 x 43 I 6.5 5.5 200 x 43 J 1325 0.5 300 x 43 K 280 1.2 300 x 43 L 125 1.8 300 x 43 M 37 3.2 300 x 43 N 20 4.5 300 x 43 O 4.5 9 300 x 43 (Note : Rheostats of other specifications / types can also be supplied)
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Resistance Coils (P-8030)
Non inductively wound wire, enclosed in a bakelite case with brass terminals. Accuracy 1%, resistance marked on top. Resistance in ohms : a) 1 b) 2 c) 5 d) 10 e) 20 f) 50 g) 100 h) 200 i) 500 j) 1000
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Resistance Box, Plug Pattern (P-8040)
Fitted in polished wooden box with bakelite top panel. Values are figured in front of respective sockets made of split brass contact blocks hold precision cut. Plug keys are made of brass and interchangeable. Plug keys are fitted in moulded bakelite top. The resistances are made of constantan wire, accuracy ± 0.1%. Ranges Total No. of Coils (ohms) Resistance (Ohms) a) 1-50 110 8 b) 1-100 210 9 c) 1-500 1110 12 d) 1-1000 2110 13 e) 1-5000 11110 16 f) 1-10000 21110 17
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Wheat Stone Bridge, Plug Pattern (P-8050)
P.O. Box comprises three pair of ratio coils of 10, 100 and 1000 ohms and 16 series coils. Total 11110 ohms. Two tapping keys are provided for battery and galvanometer. Standard Quality a) Manganin Coils, Accuracy: Ratio coils 0.05%, others 0.1% b) Precision Quality, Constantan Coils, Accuracy: Ratio of Coils 0.02%, others 0.05% c) Educational Quality, Constantan Coils, Accuracy: Ratio of Coils 0.1% and others 0.2%
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Capacitance Substitution Box (P-8060)
Consist of 12 capacitors ranging from 100 pF to 0.47 microfarad (standard capacitors) selectable by rotary switch. Fitted inside a wooden box, well polished, and outside connection by a pair of 4mm sockets. Capacitance values are 100pf, 200 pF, 470 pF, 1, 2.2, 4.7, 10, 22 and 47nf and 0.1, 0.22, 0.47 Microfarads, Accuracy ± 3%, 250V DC.
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