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Telescope built in the Newtonian configuration with one axis of the mount polar-aligned for tracking the sky circa 1936.
UMG21A22_389

Telescope built in the Newtonian configuration wit...

Telescope built in the Newtonian configuration with one axis of the mount polar-aligned for tracking the sky circa February 1936.
UMG21A22_381

Telescope built in the Newtonian configuration wit...