Nachet binocular, dissecting, compound microscope
Date: 1872-1880
Inventory Number: 1147a
Classification: Microscope
Dimensions:microscope: 30 × 19.7 × 16 cm (11 13/16 × 7 3/4 × 6 5/16 in.)
blue board box, with 1147a-c: 32.4 × 22.9 × 27.3 cm (12 3/4 × 9 × 10 3/4 in.)
Accessories: One objective # 1 with 11.5 x 0.45 mm thread; 2 (different) oculars marked corresponding to the left and right tubes B and A; microscope camera lu[1998-1-0590]; case of accessories (1147b-d)
Description:
Pillar and arm stand on a polished brass base plate (which is 16 cm wide x ~20 cm deep x ~ 0.6 cm thick). A rack and pinion focuser carries a vertical sliding tube. This can be a monocular tube or the vertical tube of a Nachet binocular microscope. One half of the exit pupil of the objective is seen by ocular "B" in the vertical tube. The other half is deflected by two prisms to the right eye up an inclined tube through ocular "A". The oculars are different to compensate for the difference in optical tube length.
To adjust for intra-ocular distance, the inclined tube is tilted. A knob on a screw moves two nuts on two different threads. One nut tilts the tube and the other tilts a lever which turns a deflecting prism by half the angle of the tube.
A microscope camera lucida associated with this instrument is CHSI inv. 1998-1-0590. A monocular tube and other accessories are 1147b-d.