Calendar: 1875-1876 Page 603

ENGINEERING AND APPLIED SCIENCES 509 governor Illustrate your explanation by hand-sketches ol tbe two governors Sketch in section the steam cylinder ports slide valve and valve-box of any type of engine that you select together with the piston piston-rod and stuffing-box and be careful to place the piston and slide-valve as nearly as you can by hand- sketch in their correct relative positions The diameter of steam cylinder in single-acting con- densing engine is feet The engine does the work of raising water to height of 120 feet by pump of 16 inches in diameter What should he the mean pressure of the steam on the piston allowing lb per square inch for friction and back pressure The weight of cubic foot of water is 62-5 lbs State the law according to which superheated steam expands in volume when its temperature is raised under constant pres- sure When steam is superheated for the supply of au engine in the usual manner does its pressure rise above that in the boiler How do you find out the work actually done by the steam in moving the piston of an engine Describe the operation by referring to diagram and show tbe mode in which tbe measure- ment of work is effected Give general description of tbe kinds of crossings used upon railway and sketch the different ways in which they may be laid Sketch the lenses and prisms as they are arranged for cata-dioptric light of lighthouse and explain the principles upon which the rays of the lamp are directed by them Sketch and describe Sir Joseph Whitworth's millionth measuring machine What are the conditions upon which its accuracy is based 10 Show how modification of the measuring machine is applied in the proof of guns TIRST YEAR Describe the processes of throwing and pressing em- ployed by the potter in producing articles of stoneware and sketch the machine and apparatus employed