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Instrument for the Direct Measurement of Angles in the Field of View of the Naked Eye

 

作者: A. H. Boerdijk,  

 

期刊: Review of Scientific Instruments  （AIP Available online 1955）
卷期: Volume 26, issue 4  

页码: 382-383

 

ISSN:0034-6748

 

年代: 1955

 

DOI:10.1063/1.1771303

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The instrument described contains an illuminated scale of which a virtual image is formed at infinity by means of a spherical mirror and a glass plate. The image of the scale is superimposed on the normal field of view of the naked eye, enabling direct measurement of angles in that field.

 

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