Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 94
25. Now take points I, 2, 3, 4, 5, 6, spaced at random,and with compasses from centre O transfer them tocentre line E F, as i, 2, 3, etc. Project pointsi, 2, 3, etc., vertically across the side elevation ofannulus, as i, 2, 3, etc., and project these pointsof intersection across to i, 2, 3, etc.… … so 90 A MANUAL OF MECHANICAL DRAWING. Plate 26. Intersection of Annuliis and HexagonalPrism. The method for ascertaining the line of intersectionin this case is exactly the same as for the previous lesson (Plate 25), and having- followed the severalsteps in that lesson, the student should have…
Mechanical drawing
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