Bauhaus-Universität Weimar

Titel:
L. E. Knott Apparatus Company: Scientific Instruments, Catalogue 26
Person:
Knott, L. E.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit13684/127/
122 
L. E. KNOTT APPARATUS COMPANY 
THE VON NARDROFF COLOR APPARATUS 
DESIGNED FOR THE STUDY OF COLOR PHENOMENA 
An Attachment for the Projection Lantern or Porte Lumiere 
Made under the personal supervision of Mr. F. W. Huntington 
No. 77-100 
77-100 VON NARDROFF COLOR APPARATUS. This apparatus was designed by Dr. Von Nardroff, principal 
of the Stuyvesant High School, New York City, for the convenient and satisfactory study of color phe¬ 
nomena where only one projection lantern is available. Our method of mounting is such that it is equally 
well adapted for use with the porte lumiere. Briefly, it is an attachment that converts an ordinary pro¬ 
jection lantern into a triple lantern in which each of the three beams of light is independent both as to 
intensity and direction. The general form and design is clearly indicated by the cuts above, showing two 
positions. 
maxwell's primary hues. 
Fig. t. 
FALSE PRIMARY HUES 
Fig 2 
COMPLEMENTARY HUES. 
Fig. ). 
CONTRAST EFFECTS. 
Pig- 4. 
EXPERIMENTS 
A Study of Primaries and Secondaries (see Fig. 1). The red, green, and blue glasses provided with the apparatus 
are placed in the glass holders shown in the diagram. By a movement of the lens arm these circles of red, green, and 
blue may be overlapped either in whole or in part as desired and, by means of the diaphragms, the intensity of strength 
of each color readily regulated. The effect of mixing the primaries in any desired portion, in pairs or in triples, is 
readily seen. 
False Primaries (see Fig. 2). In this illustration the glasses selected should be the purple, yellow and blue- 
green, and by proper manipulation of the diaphragms all possible hues, as well as white, may be obtained. 
Complementary Hues (see Fig. 3) are easily illustrated by carefully choosing the pairs of colored glasses to 
obtain the desired results. 
“ The Green Question ” is solved by superimposing the yellow and blue glasses in the single slide holder of 
the apparatus and again inserting the same glasses in separate slide holders, adding the beams by overlapping on 
the screen, noting that a pure white light is obtained. 
Contrasting Effects (see Fig. 4) are strikingly illustrated when a saturated color, such as green, is projected and 
the white disc arranged to partially overlap turned on; the overlap, which is really a tint, appearing nearly white, 
while the remaining white appears strongly colored of the complementary hue. If the order of projection is reversed, 
the sudden appearance of the white is very impressive. 
A Study of Tints is easily made by adding to the white beam a colored beam adjusted for intensity. 
Other Experiments. Many additional experiments will suggest themselves to the user after he has become 
familiar with the apparatus and commences to learn some of its possibilities; such, for instance, as three equally 
bright beams being made to partially overlap. The remaining portions of the beams will present intensities as the 
ratio of 1:2:3. Again, projecting on the screen a compound white, holding an opaque body in the path of the ray, 
a very remarkable shadow effect will be produced. 
Price mounted as illustrated, $45.00
        

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