Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Radiographic Model 534 (v1)
"Technical Operations, Inc"Denmark
c. 1954 to 1961length = 18 cmRadiographic Exposure

Notes: 1) Used to predict film exposure times for Iridium on the front side 2) Used to predict exposure times for Cobalt on the reverse side of one of the slides 3) Note - thesingle sided slide rule has 2 slides 4) Made by an unknown company in Denmark for Tech Ops in the USA

Image 1

Image 2

Image 3

Image 4