Thomas Hall Microscope 1860,  AST  item #797

A REMARKABLE STUDENT TYPE DOUBLE PILLAR MICROSCOPE c 1860.  distributed and possibly  MANUFACTUREd BY THOMAS HALL OF  ELECTRICAL, OPTICAL AND PHILOSOPHICAL INSTRUMENTS, 19 BROMFIELD ST. IN BOSTON MASS.

The bronzed iron base is 4 x 2-3/4 inches and supports the two tubular pillars of this instrument that are 2 inches high. The 2-5/8-inch-square stage plate with collar and flanges in one casting is attached to the pillars. A 4-1/2-inch-long tubular limb is attached to the stage collar; the lower 1-3/4 inches carries a gimbal with a 1-1/8-inch double mirror.
Above the stage on a slide casing to the limb is a U-shaped slide holder.

A 2-7/8-inch arm is fixed to the top of the limb. At the front is a 1-9/16-inch ring to which is fixed a 1-1/2 x 15/16-inch tube; at the back is a double milled-head pinion. There is a 1-1/4-inch stage condenser on a ring on the tube with a universal arm. the objective is composed of 3 lenses screwed together  to gain maximum power. lenses can be removed to gain lower powers.

The body tube is 3-1/2 inches long, has a short cone nose, a rack at the back, and a draw tube with a field lens; the single eye lens screws in. The instrument is 10 inches high when closed.

the over all condition of the instrument is good, very little spotting of the gold lacquer.   Price $395

Back View

Side View

3/4 View

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Jim & Rhoda Morris

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