Immagini

DESCRIPTION

Exhibit 910 is an frame electrometer, designed by the engineer and constructor of precision instruments Max Edelmann (1845-1913).

The apparatus consists of two principle parts, one fixed and one movable: The fixed part consists of four sectors of a curved cylinder, of diameter 4,5 cm and height 4 cm; the separation between consecutive sectors is 5 mm. Inside the quadrants, the movable part (missing in our apparatus) is suspended by a conducting wire inside a long metallic tube and consists of a small mirror below which there is a rectangulare metallic structure to which is hung a sheet immersed in sulfuric acid contained in a glass receptacle. See images 1, 2 and 3.

The quadrants are screwed on the bottom to a circular brass plate that rests on a base (missing) containing three leveling screws. The opposing quadrants are connected to each other and to an external electrical terminal

To read the rotational displacement of the mirror, one uses the Poggendorf method with a lamp whose beam is reflected onto a linear scale as shown in exhibit 371.

BIBLIOGRAPHY

• [1] Nature 29, 239-240 (10 January 1884) ([222.32KB] pdf )
• [2] W.E.Ayrton, "Practical Electricity", Cassell & Company, Limi- ted:London, 1891. Pgg:130-136

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