ELECTRIC SCREENWIPERS
Electric screenwipers are being standardised on more and more new cars. It is most important to refrain from moving the blade by hand, since by so doing the mechanism linkage, or drive gears, will be definitely damaged. Should the blades or linkage jamb or bind, switch the current off to prevent the burning out of the small motor armature and field windings, FORCES OF IMPACT A vehicle travelling at 20 miles per hour meets a solid resistance with the same force as it would meet the ground when falling freely from a height of 13.4 ft. The impact at 40 miles per hour is the same as for a free fall of 53.5 ft—at GO miles per hour the same as for a free all of 120.3 ft. These calculations are on the basis of a car striking an immovable object, as, for instance, a solid wall of masonry. When two cars going in opposite, directions collide the impact would be that of their combined speeds.
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https://paperspast.natlib.govt.nz/newspapers/ESD19360914.2.124.6
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Evening Star, Issue 22443, 14 September 1936, Page 13
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168ELECTRIC SCREENWIPERS Evening Star, Issue 22443, 14 September 1936, Page 13
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