Bauhaus-Universität Weimar

The Art of Projecting. A Manual of Experimentation in Physics, Chemistry, and Natural History with the Porte Lumière and Magic Lantern
Dolbear, A. E.
The accompanying figure represents a chromatrope 
with an arrange¬ 
ment for quickly 
replacing one 
disk by another 
of different pat¬ 
tern. Rotation 
is given by fric¬ 
tion pulleys. 
With this form 
there is a disk 
with the so-called 
seven primary 
colors to illus¬ 
trate Newton’s 
theory of colors, 3. & <3 4 
one to illustrate Brewster’s theory, two to illustrate 
Young’s theory, and a chameleon top, designed by 
President Morton, of Stevens Institute, Hoboken. 
The effects with all the forms of chromatropes are 
due to persistence of vision. 
Interesting subjective effects may be observed by 
projecting in the ordinary way bits of colored glass an 
inch or two square, so as to have upon the screen a large 
patch of color with a boundary of white light. The eyes 
must be fixed attentively upon the colored patch for 
about half a minute, when the colored piece must be 
quickly removed, the eyes to be kept meanwhile upon 
the screen. To prevent the eyes from unconsciously 
wandering while looking, it will be found advisable to 
pin a large black button or a piece of black paper to 
the screen in the middle of the disk. This is to be 
kept in the centre of vision. The effects observed will 
of course depend upon the color upon the screen, and


Sehr geehrte Benutzer,

aufgrund der aktuellen Entwicklungen in der Webtechnologie, die im Goobi viewer verwendet wird, unterstützt die Software den von Ihnen verwendeten Browser nicht mehr.

Bitte benutzen Sie einen der folgenden Browser, um diese Seite korrekt darstellen zu können.

Vielen Dank für Ihr Verständnis.