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this hygrometer uses a wet bulb thermometer (left) and dry bulb thermometer (right)
Needham Type-A
This particular instruments is mounted on a fine wooden display stand
Pristine late 19th century Leslie's Differential Thermometer
low electrical tension
Dissecting Scope by Chicago Apparatus Co. lamp this hygrometer uses a wetIncredibly scarce, functional, and complete early 20th century dissecting telescope. Manufactured by the Chicago Apparatus Co. circa 1910 1930. Mahogany structure with brass features. Complete with original magnifying lens, stage plate, and 45 degree angled mirror. Adjustable arm connects the lens above the stage plate for precise magnification. The tapered ends are for ease of holding. Weight: 1lb. 7 oz. Dimensions: 9. 50" x 2. 75" x 3. 25" Sticker
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