A DOUBLE-PILLAR SUPPORTED ACHROMATIC COMPOUND MICROSCOPE
ENGLISH
c. 1850-1860
OBJECTIVES:
Optical data for these obtained with
stage micrometer and Cheshire apertometer:
| Objective |
n.a. | Magnification
with 5 X eyepiece | Magnification
with 10 X eyepiece |
|---|
| 2 In | 0.11 | 35 | 67 |
| 1 In | 0.15 | 60 | 110 |
| 1/2 In | 0.50 | 124 | 225 |
| 1/4 In | 0.60 | 250 | 460 |
| 1/8 In | 0.84 | 500 | 900 |
When acquired, this microscope came with a 2 inch Baker objective with female Ross thread, and a very large 1/2 inch Ross objective with RMS thread. Also present was a set of adapters from RMS to pre-RMS Smith& Beck, and from this to male Ross thread, which -when used together- allow for the use of Ross female internal thread objectives. An early 1 inch Ross objective of this type was added to the set, alongside an unsigned period 1/4 inch, and a Baker 1/8 inch objective, both with RMS thread. Amongst the original accessories was also an adapter for the use of pre-RMS Dancer objectives.
