. Carpenter. and the horizontal forcewas shown on the spring balance. Onexamination of one of the many resultsobtained, taking the case of the test onwhite deal, the average vertical pressureregistered on A A was 23 lb., and theaverage horizontal force registered by Fwas 40 lb. At the conclusion of the testthe wedge and plane-iron were knockedout, and weights were added until theplane was loaded to 23 lb. It was thenfound that a horizontal pull of 10 lb. wasrequired to move the plane, making itobvious that this is the horizontal forcewhich is required to overcome friction,whilst 30 lb. is usef
. Carpenter. and the horizontal forcewas shown on the spring balance. Onexamination of one of the many resultsobtained, taking the case of the test onwhite deal, the average vertical pressureregistered on A A was 23 lb., and theaverage horizontal force registered by Fwas 40 lb. At the conclusion of the testthe wedge and plane-iron were knockedout, and weights were added until theplane was loaded to 23 lb. It was thenfound that a horizontal pull of 10 lb. wasrequired to move the plane, making itobvious that this is the horizontal forcewhich is required to overcome friction,whilst 30 lb. is usefully employed in cut-ting the wood. Under these conditionsa quarter of the work expended is 1. wasted. Another method was also tried,with the object of verifying the first. Thejack plane had a carrier fitted above it,with the mouth left free, to prevent itbeing choked up with shavings. A longstring was fastened around the plane,which ran to a pulley, and weights wereplaced on the end of the string. (Fig. 2.). Fig. vertical forces were registered bythe weights on the carrier, whilst the
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Keywords: ., bookcentury1900, bookdecade1910, bookidcarpenter33u, bookyear1913
