NEW SPARK PLUGS

Shannon News, 7 December 1928, Page 2

NEW SPARK PLUGS

EFFECT ON ENGINE SHOWN. A recent engineering test in a Chicago, U.S.A., laboratory showed that an automobile engine running 20 miles an hour and equipped with spark plugs that had been in use slightly j more than 10,000 miles developed 20.6 ! h.p. With a new set of plugs the same engine gave a hofse-power reading of 25.4. Ono ‘ f horse-poAver ” is sufficient to lift 33,0001 b. one foot in one minute. The method used in determining this unit is very interesting. Back in the 18th century James Watt, inventor of the steam engine, and Matthew Boulton started to manufacture hoisting engines to replace the horses then used in the coal mines of England.

In order to compare the power Of one of their engines with that of the number of horses required to perform the same work ,they undertook to test the pulling power of a heavy draught, horse. They found that a horse could lift 3501 b. of coal 100 ft. in one minute, which is equivalent to lifting 33,0001 b one foot in one minute.