Central Scientific Company (CENCO)

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.

Instruments from this maker: 

Impulse Counter
Spot welder
Holder for mirrors and gratings
Periodic table
Wooden and metal frame from a device for illustration of pulleys
Illuminator
Lens holder
Slit vertical adjustable
Thermoelectric magnet
High Frequency Apparatus. Tesla type.
High Voltage Condenser
Frames for the magnetic effects of electrical current

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