B&L model 31-33-53 microscope lamp
Date: circa 1960
Inventory Number: 1999-1-0079a
Classification: Microscope Light Source
Subject:
Maker: Bausch & Lomb Optical Company (1853-present)
User: Gray Herbarium (founded 1842)
Cultural Region:
Place of Origin:
Dimensions:
without cord: 22 × 20 × 10 cm (8 11/16 × 7 7/8 × 3 15/16 in.)
box: 22.9 × 33 × 17.8 cm (9 × 13 × 7 in.)
Accessories: spare bulb No. 1460X in box [1999-1-0079b]
Description:
This is a Bausch & Lomb microscope illuminator. It is equipped with a transformer in the base with a step switch 5.0V to 6.75V. The lamp is mounted on an articulated arm. It has a condenser and front lens.
The condenser lens is imaged approximately 15 cm ahead of the front lens to produce a bright spot of about 40mm in diameter.
The condenser lens is imaged approximately 15 cm ahead of the front lens to produce a bright spot of about 40mm in diameter.
Signedon bottom panel: BAUSCH & LOMB OPT. CO. / ROCHESTER, N. Y., U.S.A.
on base sides (2x): B&L [in prism logo]
on base front: BAUSCH & LOMB
on base sides (2x): B&L [in prism logo]
on base front: BAUSCH & LOMB
Inscribedon bottom panel: CAT. NO. 31-33-53
in red paint on base: N55
in red paint on base: N55
Historical AttributesThis instrument was used in the Paleobotany Student Laboratory located in the Gray Herbarium, Harvard University.
ProvenancePaleobotany Student Laboratory, Gray Herbarium, Harvard University, Cambridge, MA