Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration (1906)

Page scan 000418 from Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration

Record Details:

Title:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Date:
1906
Author:
Wright, Lewis, 1838-1905
Publisher:
London, New York, Bombay : Longmans, Green and Co.
Volume:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Leaf #:
000418
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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MAGNETISM AND ELECTRICITY 403 Take for illustration Oersted's fundamental experiment of tbe deflection of a magnetic needle by the current; it is per- FIG. 222.—Oersted's Experiment fectly easy to arrange an entire fixed apparatus, and project it by the vertical method. But the truly scientific demon- strator will rather prefer to place the bare needle first in the focal plane, and bring over his wire inde- pendently, as in fig. 222, simply because his ex- planation will thus be better understood, which is his object. Ampere's experiments showing the attraction or repulsion of parallel cur- rents may be shown by any of the usual apparatus made on a small scale; but here again the same rule applies, and it is better to confine the set apparatus FIG. 223 to the movable portion, and bring up the other current independently, as in fig. 223, which is an arrangement by Prof. Forbes. A small arrow may be fixed to the wire which is held; and in this way