Calendar: 1859-1860 Page 460

APPLIED SCIENCES 461 carriage weighing one ton moves along level rail with velocity of feet per second The friction being lbs per ton the carriage will move through 348 feet before the velocity is reduced to feet per second 32£ VII- ftptiroitaticS Define fluid and state briefly some of the distinguishing properties of liquids and gases Find the pressure upon any surface immersed at given depth in water Ex sluice-gate ft square is just immersed in water required the pressures upon the upper and lower halves of the gate When rectangle is placed in fluid with one side in the surface find the point at which the pressure of the fluid acts Ex The breadth of lock closed by pair of gates is 12 ft and the depth ft and the hinges are each ft from the top and bottom find the pressure on the lower hinge Define the term specific gravity as applied to liquids and gases Ex cubic foot of timber sinks inches in water what is the specific gravity of the timber vessel filled with water weighs 5j oz piece of pla- tinum weighing 29J oz is put into the vessel displacing some of the water the vessel then weighs 33 oz Required the specific gravity of the platinum What weight of cork whose specific gravity is will just float 112 lbs of iron whose specific gravity is 7J Explain the Barometer If the surface of the body of man be estimated at 1J square metres find the whole pressure of the air upon his body The length of metre 3937 inches the specific gravity of mercury 136 and the height of mercury in the barometer 30 inches tube 20 inches long is filled with mercury and then inverted the open end being placed in vessel of mercury find the height at which the mercury stands in the tube The receiver of an air-pump is 20 times that of the barrel