1929 TYPE G U GROUNDOMETER. BORDEN ELECTIC COMPANY

Description

1929 TYPE G U GROUNDOMETER. BORDEN ELECTIC COMPANY.
Aug. 25, 1931. s. w. BORDEN 1,820,214 v METER FOR MEASURING GROUND RESISTANCE I Filed March 18. 1929 xii-25 22: 7a YE fivenior:
Patented Aug. 25, 1931 STEPHEN W. BORDEN, F SUMMIT, NEW JERSEY -METER FOR MEASURING GROUND RESISTANCE Application filed March 18, 1929. Serial No. 347,780.
This invention relates to improvements in electrical measuring instruments and more particularly to that class of instruments which are used for measuring the resistance value of the surrounding earth through which a current must travel in passing from an earth electrode into and through the adjacent earth to the earth generally. I c
The object of the invention is to provide a light, compact, self-contained, portable and ruggd meter and one Which may be constructed without any delicate moving parts. A further object of the invention is to provide a meter which will indicate by means of a pointer and scale, the resistance of the earth electrode which it is desired to measure, the indication being direct and involving no calculation other than the use of a multiplier.
In the preferred form of my meter I ob tain the current for the operation of the meter m any characteristics such as direct, alternatfrom the secondary of an induction coil the primary of which is connected through an interrupter to a battery of one or more dry cells, but it is to be understood that other sources of energy such as a hand-driven generator, a microphone hummer or even an outside source of current "may be employed and that the current may have practically ing. or pulsating so long as a suitable detector is used.