The Printing Frames made by the American Optical Co. for photo-engraving are like everything else manufactured by this factory, of the highest degree of perfection, and the utmost care was given to the comparative distance of screws so as to produce an even pressure. Many negatives have been either ruined or snapped by the use of imperfect Printing Frames.
The American Optical Co. Printing Frames for photo-engraving are the only safe ones on the market.
PRICES.
| 8 × 10, | including | one-inch | glass | $8 00 |
| 10 × 12, | " | " | " | 11 02 |
| 9 × 11, | " | " | " | 9 50 |
| 11 × 14, | " | " | " | 13 00 |
| 14 × 17, | " | " | " | 19 00 |
Larger and special sizes made to order.
To Photo Engravers:
Having systematically undertaken the improvement of photo engravers' appliances, we follow the S. & A. Photo Engravers' Adjustable Screen Plate Holder, and the S. & A. accurately adjusted Photo-Engraving Printing Frames, with the