Triangle Qin

-A style of gin in two patterns, 10 fe … and 17 feet respectively. The only latter are for guns, general on; traveling, service; ":' the former are applicable to mounting or standing carriages, platforms, wagons, etc.," and two of them are required with all guns heavier than 56 cwt. ' Triangle of Reference. — In map reading, it has been calculated that to ascend a slope of one degree, until reaching a point one foot above starting point, a nerson would have to walk a distance corresponding to a "horizontal equivalent" of 19.1 yards, as may be seen by constructing the triangle. As from this triangle other horizontal equivalents fer different degrees of slope and various vertical intervals may be reckoned, it is called the triangle of reference.