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Gear set

Details

Artifact no.
1996.0167.001
Model
53-14-76
Manufacturer
Bausch & Lomb Optical Co.
Manufacturer Location
Rochester, New york, United States of America
Manufactured Date
Between 1960 - 1969
Context 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.
Context 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).
Description
SYNTHETIC GEARS. WOODEN CASE COVERED WITH LEATHERETTE & LINED WITH VELVET; METAL SNAP CLOSURES ON LEATHER STRAPS; PAPER LABEL INSIDE CASE
Number of Parts
11
Artifact Finish
BLACK LEATHERETTE COVERED CASE: PURPLE VELVET LINING ON LOWER PORTION HOUSING GEARS. BLACK GEARS OFF-WHITE PAPER LABEL INSIDE CASE.
Artifact 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'
Artifact Missing
NONE
Group 1
Exploration and Survey
Category 1
Photogrammetry
Subcategory 1
Plotting equipment
Material
synthetic->leatherette;wood->;fibre->velvet;metal->;skin->leather;paper
Length
21.3 cm
Width
13.0 cm