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A GLARELESS EAR SPECULUM

A GLARELESS EAR SPECULUM This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables. Abstract I have found that when light is directed through the speculum now in common use, which is shaped similarly to that shown on the left in figure 1, the illumination on the objective is not uniform, spots of increased intensity of light resulting, probably due to reflection of the light rays back and forth on the curved, conical inner surface of the speculum which causes convergence of the light rays at certain spots. A means is therefore provided to obviate this difficulty and for producing a substantially uniform light on the objective through the speculum. To this end the outer, or tip, end of the speculum is formed with a great many relatively small perforations, these being relatively close together and extending substantially half the distance from one end of the speculum to the other, or forming the entire wall. I have found that with such construction a substantially uniform http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Otolaryngology American Medical Association

A GLARELESS EAR SPECULUM

Archives of Otolaryngology , Volume 25 (2) – Feb 1, 1937

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Publisher
American Medical Association
Copyright
Copyright © 1937 American Medical Association. All Rights Reserved.
ISSN
0003-9977
DOI
10.1001/archotol.1937.00650010232010
Publisher site
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Abstract

This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables. Abstract I have found that when light is directed through the speculum now in common use, which is shaped similarly to that shown on the left in figure 1, the illumination on the objective is not uniform, spots of increased intensity of light resulting, probably due to reflection of the light rays back and forth on the curved, conical inner surface of the speculum which causes convergence of the light rays at certain spots. A means is therefore provided to obviate this difficulty and for producing a substantially uniform light on the objective through the speculum. To this end the outer, or tip, end of the speculum is formed with a great many relatively small perforations, these being relatively close together and extending substantially half the distance from one end of the speculum to the other, or forming the entire wall. I have found that with such construction a substantially uniform

Journal

Archives of OtolaryngologyAmerican Medical Association

Published: Feb 1, 1937

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