spectroscope with gas burners and electric light
Date: circa 1925
Inventory Number: 1996-1-0622
Classification: Spectroscope
Subject:
Maker: Eastern Science Supply Company (fl. 1910s - 1940s)
Cultural Region:
Place of Origin:
Dimensions:
44 x 65 x 30 cm (17 5/16 x 25 9/16 x 11 13/16 in.)
Description:
At one end of the supporting arm is a direct-vision spectroscope. It is equipped with a prism, an adjustable slit and a pivoting eyepiece. The latter's motion is measured by a simple needle over a 0-50 scale divided in single units. At the other end is an electric light bulb in a socket, height adjustable. Close to the bulb is a condenser lens to focus the light on the middle section of the apparatus, composed of a metallic mesh and three gas burners. Under each burner is a stopcock to let gas in or not. The supporting arm rests on a tripod.
Signedon plaque: MADE BY / EASTERN SCIENCE / SUPPLY COMPANY / BOSTON MASS. U.S.A.
FunctionThis instrument was used to observe the spectrum of burning elements. The burners would heat a substance, which would emit vapors. Intense light from the bulb would be condensed by the lens and shone on the vapor. Looking through the spectroscope one would see spectral lines, which would then be analyzed to determine what kind of substance was burning.