Year/Period |
1820-1870 |
Maker |
ONBEKEND/UNKNOWN |
Country |
United Kingdom |
Signature |
Unsigned |
Category |
Microscopes |
Optical 1 |
Compound |
Optical 2 |
Non-achromatic |
Size of the box (h x w x d) |
8.5 × 28 × 15 cm |
Size of the microscope (h x w x d) |
25.6 × 6.6 × 7.5 cm |
Inventory number |
SM 23 |
With the microscope goes its wooden box, the inside of which is lined with red velvet.
The microscope is built as a drum microscope, coarse adjustment is by sliding the body tube in its sleeve. Fine adjustment is by rack work. In the drum is a concave mirror which can rotate about its axis.
The integral spring stage has provision for both normal object slides and a glass tube for observations of live animals in water.
The microscope has a three-lens eyepiece with two eye lenses and a field lens, separated by a diaphragm. The focal length is 48.8 mm, the magnification is 5.1×.
There are six objective lenses and a Lieberkühn which has no lens anymore.
The objective lenses have been investigated on the microscope itself.
| Objective | 1 | 2 | 3 | 4 | 5 | 6 |
| Focal length (mm) | 5.5 | 13.95 | 20.20 | 24.04 | 28.61 | 35.06 |
| Magnification | 137.8 | 49.2 | 33.5 | 26.9 | 21.65 | 16.4 |
| Numerical aperture | 0.15 | 0.053 | 0.043 | 0.042 | 0.043 | 0.039 |
| Resolving power (µm) | 3.75 | 7.25 | 9.5 | 9 | 11 | 9.5 |
| Star test | coma | good | good | good | good | good |
Accessories are: five object slides made of bone and a live box. In the box a lens for incident light, an object clamp, and a pair of tweezers, these are probably not original.
info@stichtinghistorischemicroscopie.nl
Visseringlaan 25
2288 ER Rijswijk
The Netherlands
RSIN: 804217361
KVK: 41182753
IBAN: NL53INGB0007728414
The Historical Microscopy Foundation is independent and non-commercial. Your support is vital to enable the Foundation to fulfil its mission and to guarantee its continuity. We are very grateful for all financial contributions, as well as donations of progress objects for the collection.
Donate
