Calendar: 1893-1894 Page 864

cxlvi FACULTY OF SCIENCE figure so produced into an isosceles triangle its apex in and its base in AB produced right hexagonal prism having all its edges l£" long has its axis vertical Two of its edges make angles of 20 with Its upper face is 6" from the ground plane and its nearest corner in plan to is 1" distant from it Show in elevation the shadow cast by the prism 10 cross is high 1' square throughout The horizon- tal portion begins at 4' from the ground and projects 1' on each side This cross stands in the centre of slab 4' square and 1' high and this again is in the centre of slab 7' square and 1' high Scale J" to 1' Represent the whole isometri- cally 11 6" set square of 45 having in its centre circular opening of 1" diameter and thickness of has one of its shorter sides resting on the table Represent this set square when its face makes an angle of 45 with the and 60 with the The angle of 90 is the one farthest from us on the ground Scale rds the full size 12 Draw circle of 88" diameter and place in it ring of ten circles each in contact with those on either side of it and all tangential to the original circle and within the ring draw another circle that shall be tangential to all the circles composing it As this question is especially intended to test neatness of work no marks will be given for careless working out XL-Ct'btl ngtiumncj FIRST YEAR Describe four ways of continuing chain lines past obstructions and of ascertaining distances to inaccessible objects What is "Traverse Survey" and how is it carried out Explain how land is contoured and the results plotted