G - Physics
01
N
73/71, 324/29.9
G01N 27/04 (2006.01) G01N 27/12 (2006.01)
Patent
CA 1135792
- 1 - CASE 3983/CAN ABSTRACT This invention relates to a device for sensing moisture on a metal surface such as a brake path. Since the presence of moisture on a brake path causes inefficient working of the brake, it is necessary to test for moisture. Originally this was done by hand. The present invention provides a device which can test for moisture automatically. The device comprises a pair of contacts urged against an electrically conduct- ing surface. One contact is covered by a strip of material, for instance paper, which is an insulator when dry and a conductor when moist. If moisture is present an electrical circuit comprising the surface, the moist material and the two contacts is completed activating an alarm. The material may be salt impreg- nated and the contacts may be moveable over the surface. The device is for use in testing for moisture on the braking surfaces of colliery winding installations.
334268
Coal Industry (patents) Limited
Fetherstonhaugh & Co.
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