Orthographic Projection of Candlestick Telephone
Orthographic projection drawing of a candlestick or upright telephone. An orthographic projection is the method of representing the exact form of an object in two or more views on planes generally at right angles to each other, by dropping perpendiculars fro the object to the planes.
GalleriesTelephone and Telegraph Industry
Thomas E. French and Carl L. Svensen Mechanical Drawing For High Schools (New York: McGraw-Hill Book Company, Inc. , 1919) 22