The outlines of physics: an elementary text-book (1897)
Nichols, E. L. (Edward Leamington), 1854-1937 · New York, The Macmillan Company; London, Macmillan & Co., Ltd. · leaf 387
reedom of rota-tion upon a horizontal axis. (See Fig. 343.) Send a beam of hori-zontal light to the mirror from a projecting lantern or from a portelumiere^ placed outside the room and reflecting the suns rays inthrough a hole in the shutter. (6) Rock the mirror to and fro upon its axis, and notice…
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
