ELECTRIC HOOTERS
HOW TROUBLE OCCURS AT BUTTON CONTACT.
After being in use for some time it may happen, that the. working ol the electric horn befomes erratic. The trouble may be due to tbe horn mechanism being! in need of cleaning and adjustment, but quite often it is caused by a defect in the push button.
Most buttons consist of a disc of insulating material in which, diametrically opposite, are two screws, serving the dual purpose of holding the wires and acting as contacts. Secured to the inner end of the push button itselr is a brass or copper washer which, when the button is pressed, makes contact with the heads of the two screws, thus completing the circuit and allowing current to pass to the horn. it is almost inevitable that sparking should occur between the screw heads and the washer, as a comparatively heavy, but momentary, current is required’ by moist horns. The sparking causes the contacts to become burnt and pitted after a time, so that ’the scale formed acts as an insulator; this prevents a- proper flow of current to the horn. It is a matter of only a few minutes’ work, however, to dismantle the push button and clean the contact screws and ring with a deadsmooth file or with emery paper, according to the depth of the pits.
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https://paperspast.natlib.govt.nz/newspapers/HAWST19291116.2.124.2
Bibliographic details
Hawera Star, Volume XLIX, 16 November 1929, Page 14
Word Count
224ELECTRIC HOOTERS Hawera Star, Volume XLIX, 16 November 1929, Page 14
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