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Friel-Sturdy radiographic slide rule by the Unique Slide Rule Company

Friel-Sturdy radiographic slide rule by the Unique Slide Rule Company

c.1946
One radiation slide rule for calculating energy in Planck functions

One radiation slide rule for calculating energy in Planck functions

1950-1960
Friel-Sturdy radiographic slide rule with case by the Unique Slide Rule Company, used to determine exposure times for medical X-rays.

Friel-Sturdy radiographic slide rule with case, to determine exposure times for medical X-rays

circa 1946