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Post Office Box (Plug Type)
(EE - 505) |
Post Office Box Plug Type : Having three or four pairs of
ratio coils of (10, 100, 1000 ohms) and 16 series coils of
selected double covered wire enclosed in a teakwood case
with Sunmica Top. The blocks are made of brass size 1/2"
(Square Rod) nicely golden lacquered and resistance values
are engraved on them. The top is manufactured from
Bakelite. Two tapping keys are provided for Battery and
Galvanometer. All plugs are interchangeable. All coils are
calibrated on Imported Testing Bridge Accuracy ± 0.1%
(a) P.O. Box 3 Ratio |
: Resistance 1-5000 ohms.
: (Ratio 10, 100, 1000 ohms.) |
(b) P.O. Box 4 Ratio |
: Resistance 1-5000 ohms.
: (Ratio 1, 10, 100, 1000 ohms.) |
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