2. A channel starts from a reservoir of still water, its longitudinal gradient varies at different parts of its length, and sharp curves occur on steep grades. Explain carefully how you would design the cross section so that every part of the channel would run full without overflowing. 3. Discuss fully the method of determining the effect of a weir upon the flood levels of the river above. 4. Write an essay on tides and tide-gauging. 5. Explain fully how you would proceed to determine the true meridian with a high degree of accuracy. Describe the instruments used, the calculations required, and the precautions you would take against instrumental and atmospheric errors. MECHANICAL DRAWING AND DESCRIPTIVE GEOMETRY. The Board of Examiners. 1. A brick is placed so that its longest edges are inclined 30° to the horizontal and 10° to the vertical plane of projection, while its shortest edges are horizontal. Draw its plan and elevation. 2. A brick wall in Flemish bond is 3 feet long, 9 inches thick, and 1 foot high. Make a perspective drawing of it, one angle of the wall touching the picture plane, and its length making an angle of 30° with that plane. The point of sight is to be 1 foot above the top of the wall, and I foot to the right of the angle that touches the picture plane. Use what scale for this you think suitable. 3. Draw an epicycloid, the fixed circle being 4 and the rolling circle 2 inches diameter. 4. Make an isometrical drawing of a steam boiler 24 feet long, 6 feet 3 inches diameter, with a 3 feet 6 inch furnace tube 6 inches above the bottom, and a dome 3 feet high and 2 feet diameter placed at the centre of its length. Show all joints in shell, also rivets attaching gussets to shell and end. Scale optional. APPLIED MECHANICS. The Board of Examiners. 1. Give and account of Sir B. Baker's experiments on wind pressure at the Forth Bridge, and compare the results with those obtained at the Melbourne Observatory, and with the overturning pressure of ordinary railway carriages and chimneys. 2. The external dimensions of a brick structure are as below, and the thickness is 13 bricks. Lower part-Circular tower 20 feet diameter, 20 feet high, Middle part-Conical frustrum diameters 20 and 10 feet, height 10 feet. Upper part-Circular tower 10 feet diameter, 10 feet high. Compute the stresses throughout this structure, and design the necessary ironwork to relieve the brickwork of all tension, the weight of the brickwork being taken at 120 lbs, per cubic foot, 3. A uniform beam 20 feet long is supported at both ends and at the centre, and is loaded with 1 ton per foot from one end to the centre, and ton per foot from the centre to the other end. Draw to scale the diagram of bending moments and shearing stresses. 4. A bicycle wheel has 36 spokes which are screwed up with an initial tension of 100 lbs. each. Determine the stresses throughout the wheel under a load applied at the centre of 150 lbs., the rim being regarded as perfectly flexible. 5. Make an outline drawing of a roof truss of form similar to that at the New Australian Electric Company's Station at Richmond, and determine stresses throughout, assuming all necessary data. 6. Briefly indicate the method of designing the upper and lower lateral systems and portal bracing of a bridge of American type, such as that over the Hawkesbury River, New South Wales. APPLIED MECHANICS. SECOND PAPER. The Board of Examiners. 1. Write an essay on the strength of long columns, giving a history of the subject, and indicating the nature of the most modern practice. 2. A Cornish steam boiler is 6ft. 3in. diameter and 24 feet long, and has a furnace tube 3ft. 6in. diameter. Determine the thickness of ends, shell, and furnace tube, the proportions and arrangement of riveted joints, the position of stays and other special strengthening appliances, the material being mild steel and the working presure 100 lbs. per square inch. 3. The shore girders of the new Cremorne Bridge are 36 feet long and 6 feet deep, and have two systems of triangulation, the loads being applied at the lower panel points. Determine the central deflection with a stress of 6 tons per square inch throughout, the modulus of elasticity being 30,000,000. 4. State Wöhler's Law, and write down formula proposed by Weyrauch and Launhardt, and apply them to determine the safe working stress per square inch of (a) A tension rod under steady load of 20 tons. (b) The same rod with a steady load of 10 and an occasional load of 20 tons. (c) A bar subjected to a load varying from 10 tons compression to an equal tension. (d) The same subjected to a compression of 5 and a tension of 10 tons alternately. 5. Make a detailed drawing with descriptive notes of the autographic stress strain diagram of the University testing machine, and explain how the effect of the slip of the clips and the elasticity of the machine itself is eliminated when testing in tension. CIVIL ENGINEERING.-PART I. The Board of Examiners. 1. Make a detailed drawing of the timbering of a tunnel for a double line of railway, giving dimensions and particulars of joints and ironwork, and describe mode of operation, the material being fissured rock. 2. Give detailed sketches with full description of a road bridge 75 feet span, as constructed by the New South Wales Government. 3. Make a detailed drawing of an engineer's shaping machine. Describe the action of each part, and state how you would use the machine so as to perform its work accurately and rapidly. 4. How would you proceed to open a bluestone quarry? What facilities would you endeavour to obtain, and how would you work it to the best advantage? CIVIL ENGINEERING.—Part I. SECOND PAPER. The Board of Examiners. 1. Supply working drawings and specification of material and workmanship for a timber truss railway bridge of 50 feet span, for a 5′ 3′′ gauge |