FORE:A carriage moving on angular ways always moves steadily and easily, without play in any direction until lifted from its bearing, which rarely happens, and its lifting is easily opposed by adjustable gibs. A carriage on a flat shear is apt to have play in a horizontal direction because of the freedom which must exist to secure easy movement. In the case of tracks, it may also be mentioned that the weight of a carriage acts as a constant force to hold it steady, while with a flat shear the weight of a carriage is in a sense opposed to the ways, and has no useful effect in steadying or guiding. The rigidity and steadiness of tool movement is notoriously in favour of triangular tracks, so much so that nearly all American machine tool-makers construct lathes in this manner, although it adds no inconsiderable cost in fitting.
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FORE:He left his support, swam across the smaller channel, carefully, and secured the life preserver which had dropped into a heavy clump of the grass and then had floated free of the mud, held only by the end of a tangled stringand the skin of an empty, oilskin pouch, torn and ripped to tatters, that hung to the cord.
10, January, 2014
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14, January, 2014
10, January, 2014
10, January, 2014
10, January, 2014
FORE:CHAPTER II. THE GREEK HUMANISTS: NATURE AND LAW.