Anthony's Photographic Bulletin
On March 8th, Mr. George M. Hopkins would give some experiments on aquot;light, aquot; using the micro-polariscope. ... and as the expenses would be very heavy for such a young society as ours, something in the neighborhood of S500 (we ... The diagram shows still more clearly the working parts. ... The lever C is connected by a wire extending above the lens to the flat steel tension spring attached to the lever E.
| Title | : | Anthony's Photographic Bulletin |
| Author | : | |
| Publisher | : | - 1887 |
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