Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 28
from pencil to pen. Further, the majority of the arcsand circles the drauglitsman deals with come withintheir range. Another very useful tool is the Beam Compass,which is used for drawing very large circles. Ittakes its name from the fact that the two heads are … clamped to a wood bar or beam. It is fitted with pen,pencil and needle points. 24 A MANUAL OF MECHANICAL DRAWING. CHAPTER IV. Mensuration^ Mechanical Powers and Tables. Symbols and abbreviations: The sign for equality is = and is read equal to. The sign for addition is -f- and is read plus. The…
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-graphophonepaten15unit-531-301.webp)
