Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 326
It will be useful to the Btudent to remember as a general fact, that supposing, Fig. 2696, the observer to be facing the north. Cf, and the helix A B placed transversely before bim so that its axis maj lie est, then if the cun g the coils of the spiral directly before him. the north pole the right…
Mechanical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-479-300.webp)