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DEMONSTRATION MICROSCOPE

MAKER: BAUSCH & LOMB

SERIAL NUMBER: 148503

c. 1921

DESCRIPTION HISTORY
B and L Demo Microscope B and L Demo Microscope
B and L Demo Microscope B and L Demo Microscope B and L Demo Microscope
B and L Demo Microscope B and L Demo Microscope

DESCRIPTION:
Signed on the top of the optical tube: 'BAUSCH & LOMB OPTICAL CO. ROCHESTER N.Y., 148503', this nearly 100 year old demonstration microscope lacks a substage. The eyepiece is labeled '15X' and the objective is signed: 'BAUSCH & LOMB OPTICAL CO. ROCHESTER N.Y. U.S.A., 16mm 0.25 10X' . The optical tube is focused by sliding within its sleeve lined with cloth. A diamond-knurled knob on the back side pushes on the cloth lining to lock the tube in any desired focus.



HISTORY OF B & L DEMONSTRATION OR SCHOOL OR SALON MICROSCOPES:

Bausch & Lomb apparently started to manufacture demonstration microscopes about 1900 and these evolved over the years. The first model was similar to the earlier Beale and other designs in that it was simply a focusing tube attached to a plate supporting a slide. By 1904 a handle was added, and by 1911 it looked more like a microscope with a 'jug handle'. Variations of the jug handle continued through at least 1922. The only drawback still present in the 1922 model, was that the slide was held in place by stage clips and so as it was passed from student to student, the slide was likely to move unless taped in place.


B and L Demo Microscope B and L Demo Microscope


B and L Demo Microscope