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/lit13684/86/
SCIENTIFIC INSTRUMENTS 
81 
No. 45-30 
45-30 DEMONSTRATION ANEROID BAROMETER, for illustration and demonstration of the working 
mechanism of an Aneroid Barometer. All working parts visible through a glass dome. Air pressure, 
varied in vacuum chamber through the rubber tubing. Accurate barometric observations possible. $27.50 
45-40 ANEROID BAROMETER, Metric and English graduations, 4 inches diameter, adjusted for 
altitudes up to 5500 feet. Highly polished brass case, dial open so that mechanism may be clearly 
seen.................................................................................. 8-60 
BAROGRAPHS — THERMOGRAPHS 
No. 45-100 
No. 46-110 
45-100 IMPROVED RECORDING BAROMETER (BAROGRAPH). Records upon a chart all atmos¬ 
pheric changes in pressure, and time such changes occur. Records for one week without change 
of chart. Enables one to make weather forecasts; serves as an accurate barometer. Consists 
essentially of a “ pile ” or series of vacuum chambers secured above and below one to the other. 
Any change in pressure is greatly magnified by this series of chambers and further magnified by 
a system of levers connected to the arm which carries the recording pen. This pen makes a perma¬ 
nent hourly and daily record on the chart attached to a drum which revolves by clock work, one 
complete turn in seven days. Enclosed in glass-paneled polished mahogany case, with one year’s 
supply of charts, bottle of ink, etc........................................................$55.00 
45-102 BAROGRAPH CHARTS for use with above. One year’s supply in a box...................... 3.00 
46-110 RECORDING THERMOMETER (THERMOGRAPH). An instrument arranged to record upon 
a chart a continuous 7-day record of temperature. The arm carrying the recording pen is connected 
directly with a coil which changes as the temperature rises or falls. This pen makes a permanent 
hourly and daily record on the chart attached to a drum which revolves by clock work, one com¬ 
plete turn in seven days. Enclosed in non-corrosive metal case with glass windows, with one 
year’s supply of charts (—10 to 90° F.), bottle of ink, etc.................................... 65.00 
46-112 THERMOGRAPH CHARTS for use with above. One year’s supply in a box.................. 3.00
        

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