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/lit13684/39/
34 
L . E. KNOTT APPARATUS COMPANY 
No. 17-90 
No. 17-50 
No. 17-60 No. 17-75 
No. 17-150 
No. 17-165 
17-50 FULL SWEEP SECONDS PENDULUM, an inexpensive timing device beating intervals of one 
second —- a full sweep seconds pendulum with lens-shaped bob suspended on ground and polished 
steel knife edges. The mercury well is of steel and designed to expose a thin strip of mercury, the 
height of which may be adjusted. The well and pendulum is in an electrical circuit through the 
binding posts. With adjustable contact tip...............................................$12.75 
17-55 FLASH SECONDS PENDULUM (see National Physics Direction Sheets, Exp. S010).......... 2.65 
17-60 ZINC AND IRON COMPENSATING PENDULUM, illustrating employment of metals having 
different coefficients of expansion, in keeping constant the distance between the center of suspension 
and the center of oscillation. Mounted on an improved base................................ 22.75 
17-75 COMPENSATING MERCURY PENDULUM — a modification of the Graham’s Mercury Pendu¬ 
lum. A seconds pendulum in which the disc bob is replaced by two mercury wells in suitable 
holders. Complete as illustrated with stirrup, but without mercury.......................... 15.75 
17-90 CLOCK DEMONSTRATION BALANCE WHEEL for showing the principle of the self-regulating 
balance wheel in watch and clock movements. The two compound bars are electrically welded 
and are mounted in connection with the spiral spring....................................... 8.76 
17-120 METRONOME for interval timing in laboratory experiments. Marker operated by spring-driven 
clock-work enclosed in polished mahogany case............................................ 6.25 
17-125 METRONOME WITH BELL, same as No. 17-120, but with bell attachment which can be regulated 
to sound every beat, every second, third, or fourth beat, as desired........................... 8.50 
17-150 STOP WATCH — indispensable for accurate determination of time intervals. Excellent quality, 
stem wind, lever movement, beating one-fifth seconds....................................... 11.00 
17-165 STOP CLOCK WITH SECONDS HAND, 5-inch dial. Can be hung on wall or placed on a table 
or shelf. An accurate time-keeper, especially desirable in class-room demonstration........... 17.76
        

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