Calendar: 1878-1879 Page 626

624 APPLIED SCIENCES How many cubic yards are there in an embankment whose heights and distances are as follows Chain Feet 12 20 18 22 23 30 38 23 45 14 70 The centre width being taken at 30 feet on the balance line and the slopes being to SECOND YEAR base line was measured up slope having an angle of elevation of 35 and was found to be 97 chains long required the horizontal distance Show by diagram and give the formula for reducing base line measure on an elevated plain to its value at the level of the sea Describe the theodolite and its adjustments Describe the circumferentor The variation of the compass being 14 what will be the true bearings of the following magnetic readings 47 15 Due 32 45 84 20 Due 22' 30 theodolite placed on the top of hill having been carefully levelled it was observed that church spire miles distant was apparently on the same level the line of sight being feet above the ground How much higher was the spire than the ground where the instrument stood Find the length and bearing of base of an isosceles triangle whose sides bear 20 and 20 and whose area is 210 acres