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/lit13684/121/
116 
L. E. KNOTT APPARATUS COMPANY 
€> 
No. 73-75 
If 
No. 73-50 
Rear View 
Wing Nut Loosened 
Permits of Tilting 
immm 
g&Hgp ß 
No. 73-10 
No. 73-80 
Front View 
Dial Tilted 
73-10 KOLBE-HARCOURT OPTICAL DISC, self-contained, universal inclination, for illustrating 
in a simple direct manner the fundamental laws in optics. Rays of sunlight, direct or reflected, 
will show as white paths of light across the face of the dial. When a prism, lens, or mirror is placed 
in these rays of light there results refraction or reflection as will be indicated by the paths which 
will show on the face of the dial. The instrument has been designed for use in a lecture hall and 
the results are clear and positive, even to those pupils in the rear of the hall. We have retained 
m our new model the optical perfections of previous designs, but have greatly enhanced the value 
of the instrument by mechanical improvements which may be noted in our illustrations. We 
can obtain any conceivable angle of tilt for the dial, rotate shield and dial independently of each 
other, and provide an individual pocket for each optical part in the base of the instrument. Many 
experiments are possible with the optical disc. On the next page we illustrate a few. A special 
pamphlet describing these and other experiments will be sent upon request. Complete with all 
optical parts..........................................................................$36.00 
73-50 DIVERGING RAY ATTACHMENT. Consists of a system of concavo-cylindrical lenses mounted 
with rod for clamping to a support stand. Each individual lens sends out a bundle of diverging 
rays, and one ray from each lens will pass through the slit in the screen, forming a system of 
diverging rays which appear to come from the slit as a source and cross the face of the dial. 
Attachment only, without clamp or support stand......................................... 9.75 
73-75 REFRACTION OF WATER TANK. Fastens to the center of the dial of the optical disc. The 
glass front covers slightly more than one-half the circle so that the water level can be used at the 
90-90 mark........................................................................... 8.25 
73-80 POLARIZED LIGHT ATTACHMENT. This attachment in use is clamped to the face of the 
optical disc by' means of thumb screws. It is used in studying the fundamental phenomena of 
polarized light, uniform reflection of ordinary unpolarized light, polarization by reflection, polar¬ 
ization by multiple refractions, chromatic polarization, and many other important phenomena 
that readily suggest themselves when the attachment is in use............................... 18.75 
73-90 COWEN’S N. AND F. APPARATUS for use on the face of the optical disc to illustrate near 
and far-sightedness. Will be found a valuable accessory.................................... 1.50 
73-101 HARCOURT IMPROVED STUDENTS’ 
OPTICAL DISC for use in horizontal 
position only (see National Physics 
Direction Sheets, Exps. LI 10 to LI 18), 
Without optical parts, but otherwise 
complete as illustrated, with special 
light box and complete series of direc¬ 
tion sheets.........................$22.00 
73-102 OPTICAL DISC LIGHT PARTS. One 
set will be found ample for four groups of 
pupils working with No. 73-101. In 
box................................ 9.50 
73-106 HERSEY’S 110-VOLT LIGHT BOX 
for general laboratory use as a source of 
light............................... 6.50 
Nos. 73-101 to 73-106
        

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