The Numbers quoted above correspond with Object Glasses of the following sizes:—No. 2, 15 lignes; No. 2a, 17 lignes; No. 3, 19 lignes; No. 4, 21 lignes; No. 5, 24 lignes; No. 6, 26 lignes.
Opera Glasses covered with real Crocodile Skin and Fancy Mounts of choice selection.
[92]
PRISMATIC BINOCULARS.
ROSS LONDON
No. J O 6096.
Ross Stereo Prism Binoculars.
Brilliant Definition over an unusually large field. With Simultaneous Focussing Adjustment.
| Magnification. | Dia. of Object Glass. | Price. |
|---|---|---|
| × 8 | 24 m/m. | £7 10 0 |
| × 10 | 24 m/m. | £8 10 0 |
Focussing by Eye-pieces.