Calendar: 1880-1881 Page 672

672 APPLIED SCIENCES and state how the consumption 0£ coal is computed per horse power per hour What is the object of jacketting cylinder of an engine Sketch an indicator figure of an engine-using steam at 30 lbs pressure per square inch above the atmosphere the length of the stroke being feet and the steam cut off at one third of the stroke mark out on the diagram approximately the deviation of the curve of expansion due to using an un- jacketted cylinder Give general description illustrated by sketch of the method of taking an indicator figure of horizontal engine state the observations required to be made at the time of taking the figure Sketch surface condenser show in detail the method of fixing the tubes and describe the use of the circulating pump attached to the condenser Describe the method of guiding the piston rod of 4Grasshopper' engine and explain the principle upon which the straight line motion is obtained Sketch sections through Cornish boiler and Lancashire boiler showing how the joints in the tubes may be strength- ened to resist the pressure of steam and how allowance is provided for expansion and contraction without injury to the boiler The cylindrical barrel of boiler of wrought iron plates inch thick is feet inches diameter and 12 feet long compute the bursting pressures through the transverse and longitudinal sections neglecting the seams and taking break- ing tensile strain of the plate at 20 tons on the square inch 10 State approximately the breaking tensile strain per square inch of section of plate of single rivetted boiler plate joint ן FIRST YEAR Sketch section through pug mill and describe the operation and use of pugging clay for brickmaking Sketch and describe the machinery used for making bricks of dry clay