decade resistance box
Date: circa 1914
Inventory Number: 1997-1-1275
Classification: Resistance Box
Subject:
Maker: Leeds & Northrup Company (1903 - 1995)
Cultural Region:
Place of Origin:
City of Use:
Dimensions:
10.5 × 16.4 × 11.2 cm (4 1/8 × 6 7/16 × 4 7/16 in.)
Material:
Description:
Rectangular resistance box consisting of a hard rubber top panel and a wooden base (seen disassembled here). The top panel contains two dial switches and two small binding posts above. The dials are labeled "TENS" and "UNITS," and both have steps from 0-9. The internal resistance coils are now missing. Four large screws are present.
Signedon top panel: LEEDS & NORTHRUP CO. / PHILADELPHIA / 31764
Inscribedplaque: PATENTED / JULY 28, 1914
FunctionSuch an instrument is used to measure the resistance of electric conductors. For a short general description and other images, go to the following website.
This one is more recent but works on the same principle. The decade name comes from the fact that the resistance is measured in single units divided in two dials, each a multiple of 10, from 1 to 99 Ohms.
This one is more recent but works on the same principle. The decade name comes from the fact that the resistance is measured in single units divided in two dials, each a multiple of 10, from 1 to 99 Ohms.