DRAWING— MECHANICAL 



Saturday 



1917 



9 a.m. Two hours 



1. Illustrate the following geometric constructions by means of accurately drawn 



figures. Where the method is not clearly evident from the figure, add a 

 brief explanation. 



a) To bisect a given arc. 



b) To construct half of a true ellipse whose axes are 3 inches and 4 inches 



respectively. Sketch the curve neatly free-hand through the points 

 obtained. 



2. Make an isometric drawing of a rectangular block 3 inches long, 2 inches wide 



and 1| inches high, with a right pyramid 1^ inches high resting centrally 

 on the top face of the block. The base of the pyramid is a hexagon each 

 side of which is f inch long; two sides of the hexagon are parallel to the long 

 edges of the prism. Lengthwise through the center of the block there is a 

 circular hole Ij inches in diameter. 



3. Description. — The material of the bird house shown below is all 5 inch thick. 



The house is 8 inches by 12 inches. The vertical side walls are 6 inches 

 high. The highest point of the roof is 9 inches above the floor. There is 



no interior framework. The roof overhangs at the sides and ends 2 inches 

 (measured horizontally). A circular hole 2^ inches in diameter extends 

 through each end half-way between the sides. The center of each hole is 

 2 inches above the floor. The interior is divided into two equal com- 

 partments by a vertical partition wall parallel to the ends of the house. 



(SEE NEXT PAGE) 

 82 



