Under the stage is stored a brass container housing a small glass bottle of immersion oil.
The Hensoldt Protami
was first introduced in 1925. Before 1935, an
improved model, the one shown here, was
introduced. This example is of pre-WWII vintage. The
outer case and the microscope are constructed of
metal and brass with painted and chrome surface
finishes. The cased microscope measures 7 inches
tall, while the microscope is 10 inches tall with
both drawtubes fully extended as shown in the photos.
The microscope is focused by means the knurled collar
located midway on the body of the microscope. The
triple turret objective holder is equipped with
objectives marked T, M, and P (n.a 1.30, 1/12). The
latter is an oil immersion objective while the T
objective is divisible for obtaining the lowest power
settings. These objectives, along with various
setting of the drawtubes, are designed to provide
magnifications in the range 40-1200. The two
drawtubes each have three calibrations for use with
each objective. Additionally, the microscope is
equipped with an Abbe condenser with iris diaphragm,
removable stage clip, flat and concave mirrors on an
adjustable arm, and under the stage, a removable
storage container for immersion oil. The stage can be
flipped out of the optical path for easier
access.