this arrangement, however, proved useless.
*
unopened Plate XIX
(details: above 90º cw, lower 90º ccw; both contrast 50; black/white bars are artefacts of my preparation)
whose Figs. 5-18 illustrate Manne Siegbahn (1886-1978 *), his “The Study of Variable Currents by Means of the ‘Phaseograph’.” Philosophical Magazine and Journal of Science. Vol XX.—Sixth Series (July-December 1910) : 969-981
Smithsonian (Scientific Library, U.S. Patent Office) Libraries copy, scandate 20120324
Plate XIX opened
—
For a long time we have used the graphic representation for the magnetic magnitudes, and thus learnt to master them. p 970
This arrangement, however, proved useless. p 973
tags:
howevers; phaseograph; phaseography; representation; useless; variable currents
M. Siegbahn