Fig. 78. To describe a Steamer Cover.

Describe a circle one inch larger in diameter than the hoop after the edge is laid off; lay the hoop on the plate, allowing an edge each side, as shown by the distance between the two circles and the dot on the line AC, the circle DE representing the hoop; take the distance from A to the dot on the line AC, and set off three times the distance on the outer circle, as from A to B; draw the lines AC and BC, cutting the centre at C.

Edges to be allowed.