SEARCH FOR KNOCKS.
A SIMPLE DETECTOR
A knock or any similar mechanical sound coming from an engine is sometimes very difficult to trace. Special knock detecting devices, consisting of a microphone and ear-pieces, are used in works and service stations, but the ordinary motorist hae not access to them.
A reasonably satisfactory substitute is, however, to be found in an ordinary wooden-handled hammer. This is clasped with the palm of the hand over the head of the/ hammer whilst the end of the handle is pressed against that part of the engine near which the source of the knock is suspected, the engine, of course, being run at the time.
An ear should then be pressed firmly against the back of the hand clasping the hammer. It will be found that the noises of the engine are localised and magnified, the wooden hammer shaft being quite a good conductor of sound. If the hammer be moved to various likely spots, it should not be long before the trouble is located.
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Bibliographic details
Auckland Star, Volume LXVI, Issue 208, 3 September 1935, Page 16
Word Count
170SEARCH FOR KNOCKS. Auckland Star, Volume LXVI, Issue 208, 3 September 1935, Page 16
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