Mechanical drawing for plumbers; a concise, comprehensive and practical treatise on the subject of mechanical drawing (1910)
Starbuck, R. M. (Robert Macy), 1844-1927 · New York, The Norman W. Henley publishing co. · leaf 52
It is best always to clean the pensafter using them, for after the ink hard-ens it is much more difficult. It is alsonecessary to see that the point of thepen does not take up pieces of lint, etc.,for the tiniest piece on the end of thepen will make sorry looking work. Ofcourse it will be… … 50 MECHANICAL DRAWING FOR PLUMBERS n<?\. l^fT!TTO^>yr7.)ivy^T^l^!T^r?/-;lll!^:; N<?^
Plumbing · Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-607-267.webp)
