ASCO Senior precision rotary microtome is as per spencer
A.O. 820 and is the most advanced sectioning equipment for medical colleges,
universities, research laboratories, hospitals and educational institutions.

The internal mechanism and knife holder rest on a heavy and rigid base to
render a shake proof operation. The latest designed protective cover is
hinged to the base and swings back so that the interior parts will be
completely exposed for convenient cleaning, lubrication & setting etc.
the feed mechanism is dependent on the vertical movement of the object
block.With every complete revolution of the counter balanced drive wheel
the feed pawl engages precisely on to the teeth of the ratchet gear which
moves towards and advances the object holder throught a cone, inclined plane
mechanism in such a precism increments that tissues can be sectioned even in
one micron thickness. When the limit of the feed is reached at the end, a
safety device automatically disengages the fee mechanism to prevent jamming
and damage to the feed screws.

The feed indicator is located in the front and feed setting is controlled
by a knurled knob at the back of the microtome, to adjust section thickness
from 1 to 50 microns in steps of one microns each. The sturdy knife holder
in addition to knife elevating and levelling provides lateral movements for
complete use of knife edge.

The angle adjustable upto 300 is indicated on a reference scale. The knife
supplied with the microtome is fabricated from high carbon fine grain tool
steel which is heat treated for proper temper and tested for micro
structures. It is furnished in attractive hammertone finish and is packed
with following accessories in a wooden case alongwith operating manual.