The following was
extracted from the 1895 Zentmayer Catalog of Microscopes,
Mechanical Accessories, and Optical Apparatus ( Fiftheeth Edition)
AMERICAN COLUMBIAN STAND.
This, formerly known as the Histological Stand,
found favor from the first among practical microscopists. It was
reconstructed with many improvements in time for the World's
Columbian Exposition at Chicago, but circumstances prevented
exhibition there. It is highly recommended as compact, convenient,
and competent for any work required all modern microscopy.
The entire stand is of brass, highly finished,
and is twelve inches high when in perpendicular position, with
draw-tube closed, giving the short standard (Continental) length.
The body may be extended to the long standard (English and American)
length. Most workers, while possessed of only one stand, have
several objectives made by different manufacturers and adjusted for
different lengths of the optical body, consequently the advantage of
obtaining either extreme standard and any between with the same
instrument becomes a real necessity. The base and supporting pillar,
in one piece, is original in design and execution. The tripod
upholds a hollow divided cone, the sides forming two parallel
pillars of peculiar shape which support the bar between them by a
movable joint at the apex of the cone. Such construction gives the
greatest structural rigidity with the least dead weight, producing
perfect stability and easy portability, as well as pleasant
outlines. The joint permits all degrees of inclination from the
perpendicular to the horizontal. This tripod base offers practically
all the advantages of the horseshoe form of foot for upright work,
and is far superior for inclined and horizontal positions. The
coarse and fine adjustments are of the same style and construction
as previously described. The sub-stage and mirrors swing in like
manner; the former, affixed by a capstan set screw on a sliding
bracket, is adjusted by milled knobs on each side, and the latter by
a lengthening bar. The stage is nearly square, of ample proportions
and so placed that the object is in the same position as on the
larger stands; it has a similar carrier, and is attached to its
bracket by set screws.
A round revolving stage, similar to the one shown
on the preceding Stand, can be furnished instead at an additional
cost of $12.00.
This patent describes a new fine adustment
mechanism and a novel swinging substage which allows extreme
oblique illumination and which was very influential for the
further development of the microscope during the latter part of
the 19th century. For example, see the Ross-Zentmayer
Student Model elsewhere on this website.
Joseph Zentmayer is the maker of this
microscope while E. B. Meyrowitz was the New York sales agent.
This model was also known as "the American Histological Stand".