Year/Period |
1870-1900 |
Maker |
ONBEKEND/UNKNOWN |
Country |
France |
Signature |
Unsigned |
Category |
Microscopes |
Optical 1 |
Compound |
Optical 2 |
Non-achromatic |
Size of the box (h x w x d) |
9.2 × 26.5 × 14.3 cm |
Size of the microscope (h x w x d) |
24 × 11.5 × 8 cm |
Inventory number |
SM 21 |
The microscope is stored in its original wooden box.
It consists of a lead weighted brass footplate on which two round pillars are mounted. The mirror is mounted in a bracket on this foot. The simple stage is mounted in sleeves between the two pillars, in one of which the fine adjustment with rack and pinion, which acts on the stage. On top of the two pillars is a connecting limb with a sleeve in which the body tube can be adjusted. On this sleeve is mounted an adjustable bull’s eye for incident light.
There is a Huygenian eyepiece with a focal length of 40.4 mm, its magnification is 6.2×.
There are three biconvex objective lenses in a mount, numbered 1, 2 and 3. Lens number 1 is light green, which is caused by contamination of the glass with a trace of iron. The other two lenses are white. The lenses were investigated on the microscope itself.
| Objective | 1 | 2 | 3 |
| Focal length (mm) | 20.4 | 13.2 | 8.9 |
| Magnification | 39.4 | 61 | 96.4 |
| Numerical aperture | 0.033 | 0.051 | 0.085 |
| Resolving power (µm) | 10.5 | 6.25 | 4.25 |
| Star test | good | good | good |
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
