Bausch & Lomb Optical Co., Rochester N.Y.

 Serial number 36575

Bausch & Lomb Petrographical (Petrological) Microscope. Stand LC, c. 1902

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model. Substage

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model. Stored in the wood case.

Bausch & Lomb Optical Co. N.Y.,#36575. Bausch and Lomb petrological microscope LC model. Storage case.

 

Extracted from the Bausch & Lomb Optical Co. 1904 Catalog

Bausch and Lomb Petrographical Microscope LC model

Bausch & Lomb Petrographical Microscope

Stand LC

Base, horseshoe form, finished in our permanent bright black finish. Pillar, finished same as base. Stage, circular, revolving, with vulcanite stage plate, having scales graduated in millimeters at right angles for the location of the specimen, spring clips, circumference graduated to 360 degrees, with vernier; centering screws.

Bertrand lens monting

Substage: a modification of our complete substage, with rack and pinion adjustment for vertical movement.

Arm: polished brass, extra long, giving increased distance between optical center and base of arm.

quartz plate mounting

Focusing adjustments: coarse adjustment by standard rack and pinion; fine adjustment by standard micrometer screw movement, having pointer and graduated milled head of extra large size Fine adjustment has dust-proof collar. Adjustment of Bertrand lens by rack and pinion.

Main tube: with society screw, slots for quartz wedge and Bertrand lens, sliding prism box, iris diaphragm between prism box and Bertrand lens, draw tube nickeled, carrying standard size eyepieces. Nosepiece with centering adjustment.

quartz wedge

Polarizing Apparatus: The polarizer and analyzer are extra large Nicol prisms. The polarizing prism is carried in revolving mounting with pointer and silver circle graduated to 360 degrees. Directly above the prism is a divisible condenser for convergent light. By  an ingenious device the upper lens of the condenser can be instantly thrown to one side without disturbing any of the adjustments. (See outline drawing of condenser.) An iris diaphragm is mounted below the polarizer mounting to modify the light.

Polarizing prism is carried in sliding prism box in the main tube, so arranged that it can be thrown into the optical axis of the instrument when polarized light is desired, or thrown to one side when the microscope is used in ordinary work.

fine adjustment used on the B&L continental models

Patented fine adjustment: Feb. 16, 1897

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