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Adapted from the brief 'Screws' section of Engineering Workshop Drawing - First Steps in Engineering Drawing (1919) by Henry J. Spooner, C.E., M.I.Mech.E., A.M.Inst.A.E., F.G.S., Hon.M.J.Inst.E., etc. Please note that memorising this tea towel will only teach you the most basic skills, and will not qualify you to take up a position as clerk in an engineering company's Drawing Office.
