Six Items Concerning Draper's Self-Recording Thermometer.

TRADE CATALOG: THERMOMETERS)

Editore: Draper Manufacturing Company, New York, 1907

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The Self-Recording Thermometer was designed by Dr. Daniel Draper (1841-1931) who was one of the sons of John William Draper a pioneer in stellar photography. Daniel was instrumental in setting up the New York Meteorological Observatory in Central Park in 1868 and made a number of important meteorological inventions. The mechanism used to drive the self registering chart was made by Seth Thomas, one of the earliest and most respected clock makers in America. The recording chart is placed on the circular dial at the top of the encasing which rotates once a week. A pen mechanism attached to the thermometer records the temperature on the chart [two of which are included in this lot]. The items are;A typed letter on Draper Manufacturing letterhead offering the Henry Heil Chemical Comany of St. Louis offering them a 20% discount on either size of the device. Secretarial signature.Two of the actual charts to be affixed to the Self-Recording Thermometer; a small one of 8 inches and half a large of of 12 inches (this one appears to have bee used and is thus an example of the results).Two postcard size advertisements on thick card. One of the Self-Recording Thermometer and the other for Draper's Self-Recording Hygrometer (humidity). Images and prices on the fronts and descriptive data on the rears.Smaller placard advertising a weather vane made by the firm.

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• Titolo: Six Items Concerning Draper's Self-Recording Thermometer.
• Editore: Draper Manufacturing Company, New York
• Data di pubblicazione: 1907