JOCKEY KNIFE EDGE 1771-A
A brass nickel plated knife edge mounted on a bakelite handle 90mm long x l2mm
dia with a terminal at the upper end.
POTENTIOMETER 4 WIRE 1772
Four constantan wires 24 SWG stretched on a polished wooden base connected
in series with the help of brass strips provided with two 4mm socket terminals.
A box wood meter scale fitted on one edge of the wooden base parallel to
one meter length of 4 wires with a knife edge jockey.
POTENTIOMETER DECADE PATTERN 1773
Eight steps of 2 ohms and a slide wire of equal resistance enclosed, circular
type, divided into 200 parts and calibrated to read in millivolts all in
series and with coarse and fine rheostats provide the standardizing unit.
Terminals are provided for standard cell, galvanometer and two 1.5 volts
batteries and two sets of external test circuits, worked by a rotary switch.
Standard cell is got into circuit without alteration to the list circuit.
Range of measurement 0.0005 to 1.8 volts accuracy 0.05%
RHEOSTAT SLIDING CONTACT 1774
The electrically oxidised eureka wire is wound on perfectly round 43mm dia
porcelain pipe according to length required. The vulcanite/Aluminium hexagonal/round
supports light the pipe on each side with a rod and nuts. The guide rod carrying
the contact block is lightened with screws to the projection of the supports
and carry the third terminal which permits the instrument to be used in any
step. The contact block carries smooth phosphor bronze brush contacts. The
instrument is perfectly insulated.
| | Max Amps | Max Ohms |
Tube Dia mm |
Tube Lenght mm |
| (a) |
6.5 |
4.4 |
43 |
200 |
| (b) |
5.0 |
11 |
43 |
300 |
| (c) |
4.2 |
12 |
43 |
200 |
| (d) |
3.3 |
16 |
43 |
200 |
| (e) |
3.3 |
27 |
43 |
300 |
| (f) |
2.3 |
56 |
43 |
300 |
| (g) |
1.6 |
50 |
43 |
300 |
| (h) |
1.6 |
100 |
43 |
250 |
| (i) |
0.8 |
160 |
43 |
150 |
| (j) |
0.8 |
240 |
43 |
200 |
| (k) |
0.3 |
1700 |
43 |
200 |
| (l) |
0.3 |
2850 |
43 |
300 |
| (m) |
8.2 |
2 |
56 |
150 |
| (n) |
8.2 |
4.5 |
56 |
250 |
RHEOSTATS 1776
Extra superior quality wounded on super enameled hexagonal metallic pipe and
insulated ends with carbon sliding contacts. All the above mentioned are
available.
RHEOSTAT, SINGLE TUBE, PROTECTED 1777
Variable up-to 345 ohms at 1.2A rating, for use as a series resistor or a Potentiometer
Enclosed type, in metal case with windings on porcelain former 350mm long
x 56mm dia, three 4mm socket terminals and four mounting lungs topped OBA.
MULTI METER DIGITAL 1778
Specifications
D.C. Voltage : 200mV-1000V ±0.5%+2
A.C Voltage : 200V-750V ±1.2%+10
D.C. Current : 200µA-10A ±1%+2
Resistance : 200 Ohm-2000kohm ±0.8% +2
Maximum Display : 1999
Display Size : 16x48mm
Range : Manual
Transistor Test : Yes
Standard Accessories : Battery, Resting Probes.
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