J. Zentmayer, Philadelphia

The American Continental Stand V, c. 1895

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While this microscope is unsigned, it is clearly an example of Zentmayer's American Continental Stand V. This model, introduced at the end of the 19th century, was the last that the Zentmayer firm produced. It was made in order to capitalize on the popularity of the "Continental" style microscopes that were being offered by most of the other firms in the US and abroad. Nevertheless, this model still incorporated the lever fine adjustment mechanism that was used in Zentmayer's American style microscopes. The microscope is supplied with two objectives marked Griffith Fairport NY, a 1/5 and 2/3-inch, and an objective marked Spencer Lens Co. Student, 1-inch. The sub-stage consists of an Abbe condenser and double sided mirror. Unique among Zentmayer microscopes, this model is suppled with an aluminum stage.

The following was taken from the 1895 Zentmayer Catalog of Microscopes:




This Stand has been designed to meet the wants of those workers who prefer the Continental model. It is substantially a combination of the upper half of our celebrated American Stands with the lower half of the best Continental Stands, and is adapted to have added all the usual optical accessories of either class of Microscopes.

The Stand is constructed entirely of brass, handsomely finished and polished. The base is of horse-shoe form, filled with lead for extra weight, and gives perfect steadiness in every position. A stout pillar firmly supports the arm of the instrument on a trunnion-joint, which allows all inclinations from the perpendicular to the horizontal position. The coarse and fine adjustments are of the same style and construction as previously described. The body and draw-tube give both English and Continental standards, accommodating objectives corrected for either length. The spacious stage is made of aluminum, which is incorrodible; the dimensions (three and live-eighths inches square) are commodious even for culture slides or serial sections; the surface is plane, with recessed opening to receive a plate-glass, light-modifier, or disk-diaphragm, if wanted; removable clips are provided, with springs shaped and adjusted to hold a slide and yet allow easy movement about the field of view. The sub-stage has long sliding movements in the fixed bar beneath the stage, allowing ample room for a condenser or polarizer, and exact adjustments are easily and quickly made by aid of milled knobs extending on each side of the sliding bracket, on which the ring of the sub-stage is centered and affixed instantly by means of a single set-screw with capstan head. The mirrors. are plane and concave, of large size, and have complete adjustments on an extensible bar. The diaphragms are cone-shaped, and have three different sizes of apertures. The Abbe illuminating apparatus has a condenser of 1.20 N. A. and Iris diaphragm with complete movements. A condenser of 1.40 N. A. can be substituted, if preferred, for the difference in the cost of the condensing systems. A set of stops are also furnished for dark-ground illumination.

The Stand can be furnished with a swinging sub-stage, with or without rack and pinion movement, and with a circular centering and revolving stage, provided with a sliding carriage similar to the Centennial Stand, at an additional moderate expenditure, and it is well worthy of such conveniences.

A modification of the swinging sub-stage and mirrors can also be furnished, whereby the extensible mirror-bar slides in another bar which swings from a joint on the under side of the swinging-bar carrying the sub-stage. This construction allows the sub-stage and mirrors to swing independently of each other, click-stops indicating when either or both bars are in the optic axis of the instrument, and permits the sub-stage to be swung aside entirely and the mirrors, alone to be then swung into positions for central or oblique illumination, without interference from the sub-stage. The mirrors can be likewise swung aside completely to permit the use of direct illumination, with or without sub-stage apparatus. These movements contribute much to convenient and rapid use, as it is unnecessary to remove and afterward return the sub-stage, or mirrors, or any other part. In this instance the stage is made somewhat narrower to allow the sub-stage to swing clear aside.

The draw-tube can be graduated in tenth-inches, or millimeters, or otherwise, as desired, and the milled head of the fine adjustment can be likewise graduated to measure longitudinal movements of the body, thus furnishing quite exact and very convenient means of gauging the thickness of cover-glasses or sections at small extra expense.

19.    American-Continental Stand, Monocular, sliding sub-stage, cone diaphragms, and adjustable mirror-bar; one Ocular ; 8/16-inch Objective, 0.23 N. A.; 1/6-inch Objective, 0.61 N. A. (easily resolving P. angulatum); Abbe Illuminator, 1.20 N. A., with Iris diaphragm; Walnut Case, with drawer for Accessories,- $55.00

20.     Stand only, with one Ocular and Case,- $35.00

21.     Stand, with sub-stage movement by rack and pinion; one Ocular, and Case,- $44.00

23.     Stand same as No..21, with same accessories as No. 19, - $64.00

23.      Binocular body, with one pair of Oculars,- $30.00

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