Calendar: 1891-1892 Page 841

ENGINEERING DEPARTMENT cliii 12 circular slab of 288 diameter and £" thickness is pierced by circular central opening of 1" diameter The axis is horizontal and inclined from us towards the right at 20 with the The lowest portion of the slab is from the Give the form of the shadow cast hy the slab upon the 13 Draw map of an island Scale J" to mile Its greatest length is 14 miles and its greatest breadth miles Show two rivers and the position of three towns Draw another map of this same island half as large again Make the enlargement by means of squares 14 cylinder 4" high and 3" diameter stands on end It is pierced by square prism having axis horizontal Axis of cylinder and of prism cross at their centres Axis of prism makes angle of 30 with Diagonals of square ends of prism 2" long being respectively paiallel and perpendicular to FIRST YEAR cylinder axis vertical and long has diameter of 2" It is cut by plane at 45 with the ground that cuts the axis at the centre Give development of the entire cylinder marking on the envelope the line made by the section flight of steps Each step is long 9" high and 18" wide and their long edges make to our left an angle of 45 with plane parallel to cuts through these steps cutting the edge of the second step at point fths of its length from us Shew these steps in plan and elevation and mark on them the resulting section Scale £ Γ Draw some three or four revolutions of helical spring square in cross-section and of double-thread screw the pitch of the first being 1" and of the second 2" and the diameter of each being Make careful sketches of cam bevel and heart wheels and explain their use cylinder axis vertical and 4" long and diameter of base 3i" is penetrated by another cylinder axis 5" and