Photometer with interchangeable calibration cards

Details Photometer with interchangeable calibration cards Photometer with interchangeable calibration cards

1979-08-27

1981-05-12

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Fluid color transmission examination

324115, 356418, 356419, G01J 350, G01N 2131

Patent

active

042668778

ABSTRACT:
A photometer adapted for use with interchangeable calibration cards, comprising a galvanometer having a transparent cover over its indicator needle, the cover being provided with a slot along its edge which faces the center of the photometer, the slot being adapted to permit insertion of one end of one of the calibration cards into the covering, beneath the needle; a zone adjacent the galvanometer and the slot containing an orifice adapted to receive a photometer cell, a first control knob located on a side of the photometer for setting the photometer to its blank value; and a second control knob, for adjusting the wavelength of the photometer, having coded means thereon for corrolating various wavelengths of the photometer, produced by rotating the second control knob to various settings, to data contained on the calibration cards.

REFERENCES:
patent: 3594086 (1971-07-01), Hughes et al.
patent: 3736433 (1973-05-01), Davis et al.

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