An Ultra Violet Light Meter

Measurements of ultraviolet solar- and sky-radiation intensities in high latitudes

“…The apparatus used in measuring the intensity of ultraviolet solar and sky radiation incident on a horizontal plane was composed of three parts: (a) an electronic integrating device consisting of an Mg-phototube, condenser, and grid-glow-tube [10] enclosed in an evacuated glass chamber which was mounted in a metal box that was 451601--402-2 attached to the top of the mainmast of the boat; (b) a metal box, below deck, containing the relay, rectifier tubes, and an impulse counter ("message counter"; see fig. 4 of reference [2]) made by R. J .…”

Summary of Correlations of Bioclimatic Ultraviolet and Total Solar Radiation in Washington, D. C., 1941–1950

“…Reference is made to earlier papers, and the citations therein, for: (a) the complete description (and illustrations) of the photoelectric ultraviolet intensity meters, trigger-tube impulse counters, and automatic recorder [1,2,3,4] ; (b) the method of standardization in absolute units [3,4] ; and (c) earlier summaries of observations [4,8,9].…”

“…This type of UV dosage-intensity meter consists of a vacuum phototube having a flat, circular receiver, sensitized with Mg (in the first models made by Dr. R. J. Cashman) ; and, later, with Zr in the commercial instrument made by Dr. H. C. Rentschler [2], director of the Research Laboratory of the Westinghouse Electric Corporation. The latter model-was of large size, in order to contain all the auxiliary apparatus (trigger tube, condensers, etc.…”

A Photoelectric Cell for Measuring Ultraviolet Solar and Sky Radiation on a Horizontal Plane1

“…About six years ago, when the problem was first presented to one of us (W. W. C.) to recommend apparatus for securing a continuous record of the total incident, biologically-effective ultraviolet solar and sky radiation [2], for use in irradiating animals, the only readily obtainable instrument, adaptable to this problem, was the Rentschler ultraviolet meter [3],-a device consisting of a titanium photoelectric cell and auxiliary recording apparatus, then in use commercially for procuring a continuous record of the integrated out-put of artificial sources of ultraviolet radiation used in sterilization and photochemical processes, etc.…”

“…When the sun is obscured by clouds, the sky is a Part of the expense incurred in assembling this apparatus was defrayed by a grant from the Council on Physical Therapy of the American Medical Association. 2 Member of the Organisation Meteorologique Internationale: Sub-Commission on the production of photoelectric cells for measuring biologically-effective ultraviolet radiation; Physicist, National Bureau of Standards, Washington, D. C. 3 Professor of Physics, Northwestern University, Evanston, 111. 4 In conformity with recent terminology, in the present paper "phototube" is used as an abbreviation to designate the vacuum type of photoelectric cell, irrespective of the shape of the container, whether spherical or tubular in form.…”