The star being on the western portion of its orbit, determine the true bearing of the referring light from point of observation, having given the north polar distance to be 152° 30'. Barometer height 30° 05, and temperature of air 60°. 2. From latitude 36° 30' and longitude 144° a straight line is run 250 miles long, the initial bearing being N. 80° W. Assuming the earth to be a sphere of 4,000 miles radius, determine (a) The latitude of the terminal point. (c) The bearing of the commencing point from the terminal one. 3. How would you measure a base line for a geodetic survey? Two questions only to be attempted. HYDRAULIC AND SANITARY ENGINEERING. The Board of Examiners. NOTE.-Candidates are to select one question, and to work it out completely. No credit will be given for partial answers to more than one question. 1. Draw plan, elevation (from down stream side) and cross-section, through stream bed, of a timber weir suitable for raising the water-level in the river, whose cross section is given below, to R.L. 220 feet. The maximum flood discharge to be provided for is 300,000 c.f. per minute. The fall of the river is 6 inches per mile, and the cross-section is fairly uniform and similar to that given in the section. Shew the necessary river levels and protective works to prevent the flooding of the adjacent country. 2. Prepare a scheme of drainage for the land shewn on the accompanying plans. The stratum of peat is very spongy, and underlies the whole of the swamp. Shew details of tide gates if provided. 3. It is required to pump 3,000,000 gallons of water out of the river shown in diagram, and to deliver it at point A, 115 feet above summer level. The river has a considerable fall, and is liable to heavy floods, carrying timber, &c. Money bears interest at rate of 10 per cent., whilst wood fuel is plentiful. Give sketches, showing how you would arrange the plant, and also description, giving sizes and kind of pumps and boilers, &c., you would adopt, together with estimates of cost. ROAD AND BRIDGE CONSTRUCTION AND MAINTENANCE. FIRST PAPER. The Board of Examiners. 1. The following levels were taken on a proposed line of main road in a country district:— Plot the section, show suitable grades, figure in formation levels depths of cutting and heights of bank. Draw cross section at 12 chains. Specify in full for the construction of the road, good bluestone being available at a distance of six miles. Show clearly by a sketch plan all drainage arrangements, and indicate in outline the size and form of bridge and culvert you would employ. 2. What are the principal points to be attended to in the maintenance of a country road metalled with bluestone, and having numerous timber bridges and culverts, with heavy traffic? 3. Describe the usual methods of cleaning streets and lanes in a city like Melbourne. ROAD AND BRIDGE CONSTRUCTION AND MAINTENANCE. SECOND PAPER. The Board of Examiners. Design a bridge for road traffic under the following conditions: Bottom of creek approximately level, 70 feet wide, hard rock. Banks 15 feet high, sloping back 45°, of shattered rock and clay. Summer flow insignificant. High flood 15 feet above bed of creek. Carriage-way 20 feet wide, with two footpaths, each 6 feet wide, placed 22 feet above bed of creek. Materials available, brick, bluestone, rubble, concrete. Supply a brief specification, including particulars of centering for the arch or arches. |