|
Date: |
|
Description: | Cahn ratio electrobalance model G for determined weights to a microgram. Grey metal box with chrome handle, weighing chamber on top right of front, 5 adjustments on front panel, balance meter at top left, range switch (5 mg to 1g fsd) and red button on top, mains lead and output from potentiometer coming from rear. From left to right controls are: 10-turn potentiometer, zero adjust, calibrate, function switch, balance. Condensed operating instructions on metal panel over half of weighing chamber. Transformer for 110 V inside. Lee Cahn's patent of 1961 (UK patent 978214) descibes an electric dynamometer using the null principle of balancing the weight on an arm by an electically induced torque whose current is measured. The claim asserts that a precision of 1 in 10,000 is attainable. | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1965-1973 | Source: | University of Aberdeen | Creator: | Cahn Instrument Company | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
|
|