Field Binoculars


Accession Number: 2012.ast.9


Binoculars and case. Case is leather lined cardboard with leather straps and cover. Binoculars have adjustable eyepieces (marked “5 – 0 + 5”) and covers that can be moved to give shade to objectives. Eyepieces are in Porro prism orientation. Main body of the binoculars appears to be coated in a brown plastic material. Visible metallic parts are painted black. Binoculars can be adjusted for varying eye width, small dial on connecting bar (between each telescopic component) marks the degree of adjustment (from 56-74).

Alternative Name: Binoculars

Primary Materials:

Cover: Leather, metal, cardboard; Binoculars: Steel/iron, other metal (brass?), glass, plastic


1) On binoculars, above left eyepiece: “Prism Marine, 10x45mm Apert., U.S. Navy”,

2) Above right eyepiece: “Bausch&Lomb Optical Co., Rochester, N.Y., U.S.A.)”,

3) In center on dial,“187703”.

4) On case, inside the lid: “Bausch&Lomb Optical Co., Rochester, N.Y., U.S.A.)”,

5) Inside on a purple moving sticker: “dept.”

Dimensions (cm):

Case: Height = 23 x Width = 15 x Length = 9; Binoculars: Height = 20 x Width = 13 x Length = 6

Function: Viewing distant objects on the field.

Condition: Good

Associated Instruments:


Bausch & Lomb Optical Co., Rochester, NY

Date of Manufacture: early 20th century


University of Toronto Department of Astronomy and Astrophysics

Donated to UTSIC: No

Historical Notes: