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Vintage E. R. Watts & Son. Optical Square / best Vintage Surveyor's Square / Vintage Optical Prisms
Vintage E. R. Watts & Son. Optical Square / best Vintage Surveyor's Square / Vintage Optical Prisms, Vintage E. R. Watts & Son. Optical Square / Vintage Surveyor's Square / Vintage Optical Prisms authentic
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Vintage E. R. Watts & Son. Optical Square / best Vintage Surveyor's Square / Vintage Optical Prisms
Vintage E. R. Watts & Son. Optical Square / best Vintage Surveyor's Square / Vintage Optical Prisms, We are pleased to present this pocket sized optical square from the 1920’s.
Description
best We are pleased to present this pocket sized optical square from the 1920's. This device, by E. R. Watts & Son. LTD, allows an observer to see along a line perpendicular to the viewing direction through the use of two prisms. This produces two images, one on top of the other, of the view 90 degrees to the left and right simultaneously.
This novel little item comes in its original card case 7 cm high with a diameter of 4 cm.
Vintage E. R. Watts & Son. Optical Square / best Vintage Surveyor's Square / Vintage Optical Prisms
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