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B&L STEREO RHOMBOID ARM
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Item No: L3313
Price: $22.50
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| Made by Bausch & Lomb for their Model 240 Aerial Photo Interpretation Zoom Stereoscope. Catalog #53-70-28. Our understanding is that the instrument has two of these arms and optional stereo lenses that fit on the end (we have some). It's quite an interesting piece with lots of optics in it. If you look straight thru the top section, you get a clear upside down image. The top section rotates, and the image rotates as well. If you turn it 180 degrees, the image becomes right side up and correct left to right. There is also a control that moves one of the lens assemblies and appears to zoom the image a little. Inside is a Right Angle Prism with 1 inch square faces. Also an elliptical front surface mirror, 16mm x 22mm, two cemented doublets, and 5 single element lenses. Clearly an expensive piece. If you have the Model 240 instrument, then you need two of these as spares. If not, then what a great optical piece to experiment with. |
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