Safety-valves

angle of inclination area of opening Area of valve ball Bevel of 30 Brevet calculation center of gravity cloth cosine cubic inches depth of seat diameter of valve divide draw edition engravings experiment foot of grate forces act frustum fulcrum given lift given pressure graphic grate surface horizontal distance Hypsometry Iron less than depth lever arm lift is greater lift less lifting clear Locked method Multiply the square natural draft opening due opening in square orifice parallel forces perpendicular point of application pounds of water pounds per square pressure of steam Prof proportion rules second spring single force slant height spring balance square inch square inches-area required Square of lift Square of sine stationary and marine Steam Engine steam in pounds steam pressure Subtract telegraphy tion U. S. Army U. S. Navy valve in square vertical line water evaporated WEST POINT wood cuts