Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 43
against the working edgeof the T-square ; then turn the blade over, and, setting the endscarefully to the line just drawn, draw another line against the 40 PRACTICAL BEAVGIIT8MEWS WORK same edge adjacent to the line previously drawn. The principleof this test is shown in Fig, 58, where it will be… … ■Testing Straightedge. fine-set plane, or glasspaper wrapped round a flat piece of wood.The stock of the square should be exactly at right angles withthe blade, but, as usually constructed, this is rather difficult totest without some true instrument of reference ; and, paradoxicalas it may seem,…
Mechanical drawing
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