Images(2)

Calculator

Object number2011.101.11 a-c

Manufacturer Technical Operations, Inc.

Datec. 1976

OriginDenmark

Mediumplastic

Credit LineGift of Patricia Campbell

DescriptionRadiographic exposure calculator with leather holder and instructional plastic card.Dimensions1.75 x 7.125 in. (4.4 x 18.1 cm)
Inscriptions(a)
Printed on center piece, top: "RADIOGRAPHIC EXPOSURE CALCULATOR".

Ruler at top, with various other measurements printed in red and blue (includes: time increments; "IRIDIUM--AGE IN MONTHS"; "THICKNESS OF / STEEL IN INCHES"; "MILLIROENTGENS" , "ROENTGENS".

(c)
Black print throughout gives details on how to use (a).

Numerical charts on back.

Marks(a)
Maker's information on front bottom edge "TECH/OPS"; "© 1961, 1976"; TECHNICAL OPERATIONS, INC."; and "BURLINGTON, MASS" and back right corner “UTO MADE IN DENMARK”.

(b)
Gold print on flap “RADIOGRAPHIC / EXPOSURE / CALCULATOR / MOD. 534 /tech/ops".

Back: "UTO MADE IN DENMARK".

(c)
“Technical Operations, Inc., Radiation Products Division, Burlington, Ma. 01803".

Historical NotesDonor Patricia Campbell's husband, Clyde H. Campbell, worked for NAVCO (National Valve and Manufacturing Company) from 1967 to 1985. NAVCO was a pipe and valve manufacturing firm started by Henry E. Haller. They had two local plants in Etna and Lawrenceville. Radiographers would test the welds on the pipes to make sure they were sound. Campbell served four years in the U.S. Navy before apprenticing at NAVCO at the age of 23. The plant closed in 1985, during the recession, which decimated much of the industrial sector in the region. Campbell then worked as a radiographer at a Beaver nuclear power plant. His family attributes his death from leukemia to radiation exposure, but said that they can not prove this.

Related institution National Valve and Manufacturing Company

Previous owner Clyde H. Campbell

Related institution United States Navy

Subjects