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Central Scientific Company

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Central Scientific Company was founded in 1900 in downtown Chicago. It was formed out of what was left of the Olmstad Scientific Company.
Central Scientific manufactured and distributed science teaching equipment for schools, colleges, and universities by catalog mail order. The trademark "CENCO" was used from 1909 onwards.

References
Link: 
Wikipedia page
Instruments from this maker: 
ELE44.jpg
 Resistance box
ELE43.jpg
 Dynamo analysis apparatus
Linear expansion apparatus
MES12.jpg
 Surface tension apparatus
MAG06.jpg
 Distribution of magnetism apparatus
MEC08.jpg
 Rotational Inertia apparatus
MEC09.jpg
 Schmidt's gyroscope
HYD07.jpg
 Viscocity apparatus
ELE42.jpg
 Galvanometer Weston

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