The string of generally-silly (science-wise) 1950's films continues ...

1. "Flight to Mars" -- expedition to Mars encounters dying
civilization in satin miniskirts. Female earth lead uses slide rule to
compute navigational coordinates during voyage. Shots of drafting and
draftsmen at work, with tools, also.

2. "Angry Red Planet" -- expedition to Mars encounters thriving
civilization that kicks them off-planet. Craft commander uses 10-inch
slide rule in two scenes, (a) to compute navigational coordinates, (b)
as a hand prop carried during a conversation, and used for emphasis.
Possible other sighting of a dark-colored circular rule used (set and
read) by radioman. Bonus: for afficiandos of early computers and
related equipment, the spacecraft control room is essentially four jet
fighter seats clustered around a Burroughs 205 minicomputer.
Earthbound computers are featured, too.

3. NOT a side rule sighting, but perhap of interest to list
members: "Spaceways" (1953). I expected SR usage here, as the female
lead is "chief of the mathematics section." Instead, two different
types of electromechanical calculator chugging away are interesting.
Plus, the mission control and administrator's offices interior shots
seem to be at the offices of the HM Nautical Almanac (this is a
British film). The iconic image of a navigator using a cross-staff
with the logo, "Man is not lost" features prominently in the setting.
Perhaps (at least one) of the calculators was used to actually produce
nav tables for publication.

Best,
Mike