General Information

Serial #

N/A

Part Number

1

Total Parts

11

AKA

N/A

Patents

N/A

General Description

SYNTHETIC GEARS. WOODEN CASE COVERED WITH LEATHERETTE & LINED WITH VELVET; METAL SNAP CLOSURES ON LEATHER STRAPS; PAPER LABEL INSIDE CASE

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

21.3 cm

Width

13.0 cm

Height

1.8 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Exploration and Survey

Category

Photogrammetry

Sub-Category

N/A

Manufacturer

AKA

Bausch Lomb

Country

United States of America

State/Province

New York

City

Rochester

Context

Country

Canada

State/Province

Ontario

Period

THIS TYPE OF SET USED C.1950S-1970S, AND POSSIBLY LATER

Canada

Unknown

Function

GEAR COMBINATIONS ARE USED IN A UNIVERSAL TRACING TABLE TO MECHANICALLY CONVERT THE COUNTER READINGS INTO UNITS OF THE SELECTED MEASURING SYSTEM (IN THIS CASE FEET), WITH REFERENCE TO INCIDENTAL MAPPING SCALE.

Technical

THE SELECTION OF GEARS IN SETS LIKE THIS PROVIDES A FAIRLY UNIFORM DISTRIBUTION OF DIRECT READING SCALES,OVER THE ENTIRE RANGE OF MAPPING SCALE (REF.2).

Area Notes

Unknown

Details

Markings

BAUSCH & LOMB LOGO 'B / & L' WITHIN INVERTED TRIANGLE APPEARS IN SILVER SCRIPT IN UPPER LEFT OF CASE TOP/ PAPER LABEL INSIDE CASE READS IN PART: 'GEAR CHART/ 53-14-76/...One Revolution of Elevation Counter= 10 feet.../ FORMULA FOR SCALE DENOMINATOR: d=1500.A/B.C/D'. [TEXT REPRODUCED IN FULL IN SUPP.INFO. FILE]/ GEARS MARKED [.1-.11] 'F80', 'F60', 'F60', 'F60', 'F66', 'F36', 'F40', 'F90', 'F51', 'F66', & 'F72'

Missing

NONE

Finish

BLACK LEATHERETTE COVERED CASE: PURPLE VELVET LINING ON LOWER PORTION HOUSING GEARS. BLACK GEARS OFF-WHITE PAPER LABEL INSIDE CASE.

Decoration

N/A