Foot radius 12 cm, height c. 46 cm
Case 50 x 30,5 x 24 cm
This a an example of a very large 19th century lacquered
brass binocular microscope, the "Large Best, or No 1 Stand", complete
with its mahogany case and accessory box. On the microscope tripod foot
there is a rotable disc with a pair of tapered, turned brass pillars; they
support the trunnions to the limb. It is numbered 9346 at the end of a leg.
The binocular body tube has coarse focus by rackwork and two knurled knobs;
fine focus is by short lever on the nosepiece, where the knob is divided
in 10 numbered parts. The interocular distance is regulated by rackwork.
The lower limb has a triangular section, where slides a collar bearing the
plano-concave mirror on an articulated arm.
The mechanical stage can be rotated within a graduated rim with 1° intervals,
controlled by a vertical pinion at the left that can be disengaged as desired.
Immediately under the stage is an iris diaphragm. The condenser slots in
a collar moved by rackwork.
Accessories include a stage bull's eye and stage forceps, tweezers, a pair
of eyepieces, the key to fix the limb, a black collar for light filters.
The three objectives are in cans signed:
1 ½ R & J. BECK LONDON & PHILADELHIA
2/3 R & J. BECK LONDON & PHILADELHIA
1/5 R & J. BECK LONDON & PHILADELHIA
They can be housed in a triple nosepiece in aluminium.
After arrangements with R. & J. Beck, James W. Queen
& Co. constituted special agents in the United States with a full line
of their goods.
