Calendar: 1887-1888 Page 713

CLOTHWORKERS' SCIENCE EXHIBITIONS 717 the external pressure on each of the four sides and on the base when the box is on the point of sinking Explain the action of the siphon Determine the limiting height of the siphon used for decanting mercury whose density is 136 when the height of the water barometer is 33 feet The length of the tube of barometer is 32 inches some air has got into the space above the mercury and in consequence the mercury stands at 29 inches when it would stand at 30 inches if the instrument was uninjured find the true height of the barometer when the injured instrument reads 284 inches 10 Describe the forcing pump The area of the piston of forcing pump is square inches find what force must be exerted to push it down when the water in the ascending tube is at least 30 feet above the piston -9fu 0tcrf State Newton's Second Law of Motion What support is derived from experiment and from obser- vation for the statement that mass and weight are pro- portional thin piece of wood in the shape of parallelogram is just immersed vertically in water with one side on the surface compare the pressures on the two triangles formed by joining two of the opposite angles of the parallelogram Explain how to employ the Balance to determine the density of solid Describe standard mercurial barometer and explain how to take accurate readings with it How would you determine the ζ hygrometric state י of the air Give the laws relating to the evaporation of liquids volume of 750 of air under pressure of 75 centimetres of mercury and at temperature of 20 is raised to temperature of 80 and its pressure is changed to 66 centimetres of mercury find the new volume