Year/Period |
1880-1910 |
Maker |
SALMON |
Country |
United Kingdom |
Signature |
J. Salmon & Son / Makers / 4 Seymour St. / Euston Sqre / London N.W. |
Category |
Microscopes |
Optical 1 |
Compound |
Optical 2 |
Achromatic |
Size of the box (h x w x d) |
39 × 22 × 20.1 cm |
Size of the microscope (h x w x d) |
34 × 11.8 × 17 cm |
Inventory number |
SM 26 |
The microscope is kept in a wooden box with three drawers.
It is a simple student microscope with an ‘English foot’, mounted on a wooden board which slides into the box. The upper part of the microscope is mounted between trunnions. Coarse adjustment is by rack and pinion, fine adjustment by means of a lever acting on the nose piece. The circular stage has a simple mechanical attachment. Below the stage a rotating stop with four holes. There is a concave mirror in a bracket.
Accessories are a bull’s eye condenser on a stand for incident light and a live box.
The Huygenian eypiece has a focal length of 36.2 mm, its magnification is 6.9×.
The objective lens has a RMS thread, it is marked ‘weak’ and ‘strong’. There are three combinations possible. It was measured on its own microscope.
| Objective | 1 | 1+2 | 1+2+3 |
| Focal length (mm) | 18.55 | 9.54 | 7.23 |
| Magnification | 45.92 | 93.48 | 129.5 |
| Numerical aperture | 0.088 | 0.18 | 0.25 |
| Resolving power (µm) | 4 | 2.5 | 1.75 |
| Star test | coma | coma | coma |
info@stichtinghistorischemicroscopie.nl
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RSIN: 804217361
KVK: 41182753
IBAN: NL53INGB0007728414
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