The Ultra-Violet and Visible Transmission of Eye-Protective Glasses Page: 2
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PREFACE
Many glasses have been recommended and extensively adver-
tised to absorb injurious radiant energy and so protect the eyes
when worn as spectacles or goggles. However, physiologists and
oculists desiring to experiment to determine the value of such
glasses have little to guide them in their selections except the
claims of makers and sales agents. In order to experiment or
prescribe intelligently it is obviously necessary that authentic and
authoritative data should be available on the spectral transmission
of the various glasses which are being commercially promoted as
valuable in protecting the eye from harmful radiant energy.
Feeling this need of data, Dr. W. C. Posey, chairman of the com-
mittee on hygiene of the eye, American Medical Association, for-
mally requested this Bureau to make an investigation of the
spectral transmission of these glasses. The present paper is a
report upon the investigation undertaken in response to this re-
quest. It deals only with the visible and ultra-violet transmissions,
an analogous paper, dealing with infra-red transmissions, having
already been published by the Bureau.'
Part of the determinations have been made in the physical
laboratory at Cornell University. Thanks are due to Prof. E. L.
Nichols, of Cornell, for courtesies extended the Bureau in affording
facilities to expedite this work, which would otherwise have been
greatly delayed.
The authors have had the advice and cooperation of Irwin G.
Priest who originally planned and initiated this investigation, but
was obliged to lay it aside on account of other duties.
J. T. Filgate has assisted in observing and computing.
1 Coblentz and Emerson, Bur. Standards Tech. Paper No. 93, May, i917; 2d edition, April, 1918; 3d edition,
February, rg99.
2
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Gibson, K. S. & McNicholas, H. J. The Ultra-Violet and Visible Transmission of Eye-Protective Glasses, report, June 7, 1919; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66507/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.