 |
 |
||||
 |
 |
 |
|||
 |
 |
 |
|||
 |
|
|
|
|
|
|
|
||||
|
|
|
|||
|
|
|
|||
|
|
|
|
|
|
Pocket Microscope by John Browning (No. 264 ) |
|||||||||
 |
Age: c1860 Made by: John Browning Made in: London |
||||||||
 |
|||||||||
|
John Browning, London
440 |
|||||||||
 |
|||||||||
|
Imaging
|
|||||||||
| This is a pocket compound microscope made by John Browning of London. The microscope body is supported by a cylindrical pillar and two folding brass legs. The pillar is hollow and contains the fine focusing mechanism. The stage is mounted to the mechanism and moves up or down when the focusing knob is turned. An internal spring maintains tension on the mechanism. Microscope optics consist of an eye lens, field lens, and three-lens objective. The field lens is mounted permanently inside the body tube. The microscope and sample slides may be stored in a mahogany case. "John Browning London 440" (440 is the serial number) is engraved on the side of the mounting tube. Eight sample slides, many of which are diatoms, are included with this instrument. Imaging is very good showing minimal spherical and chromatic aberration. The microscope is 15cm long. This microscope was advertised for £1 11s 6d.
John Browning, "Optical and Physical Instrument Maker to Her Majesty's Government" (1860-1872) probably was the successor to Spencer, Browning and Co., c.1860. He was the third in a generation of "John Brownings" all of whom were optical makers. This John Browning (3rd) was famous for his spectroscope and instruction book. |
|||||||||