A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 91
sliding. This is done when the wheels of a heavilyloaded stage or wagon descending a steep hill are locked, that is, preventedfrom turning by an apparatus provided for the purpose. The resistance isthus increased to such a degree that the load can descend in safety. On thesame principle, brakes are… … Fig. 81. Fig. 81 has been used. D E is a table,on which rests the block C. A string,passing over the pulley B, connects thisblock with a scale, A. By puttingweights in the scale till the block moves,we are enabled to measure its friction ;and, by making the block of differentmaterials, varying its…
Physics
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