The Library Microscope has a finely finished and japanned foot, arm with joint to incline, a nickel plated body or tube, carrying the optical parts of the instrument and adjustable by rack and pinion, with draw tube to increase magnifying power; a concave mirror, swinging so as to give oblique illumination when desired, and capable of being brought above the stage for illumination of opaque objects. The screw at the lower end of the tube is so arranged as to permit the attachment of achromatic triplets, so that if desired a much higher magnifying power than the above can be obtained. The stage is made of hard rubber, which is not injured by water or ordinary fluids, and is provided with spring clamps for holding object slides. The camera lucida, which accompanies this microscope, although exceedingly simple, is a valuable addition for the same, and greatly adds to its usefulness. It is very easily managed and a little practice will enable anybody to make by the aid of it drawings of the magnified image of microscopic objects. The microscope has one eyepiece and a divisible two-lens objective, giving, in combination with the draw tube, magnifying power of from 50 to 125 diameters.......$10

The Family Microscope base and pillars are of cast iron, neatly japanned. They support the axis, which carries the arm in such a way that the instrument may be inclined to any angle. Rack and pinion for adjustment of focus, made with such exactness as to leave no perceptible jar, and neither lost or lateral motion while adjusting. In order to give greater sensitiveness to the adjustment, the milled heads of the pinion have been made of large dimensions, in consequence of which the lower and medium powers can be adjusted and used with great ease. The tube is supplied with standard Society screw. The mirror, which is concave, is so arranged that it can, if desired, be swung above the stage for the illumination of opaque objects. A revolving diaphragm is fixed beneath the stage. This stand is accompanied by one eyepiece, "B", mounted in either hard rubber or brass, and one objective, 1/2 inch, which divides so as to permit the separate use of the posterior combination, thus giving the power of an excellent 1 1/2 inch. Range of magnifying power from 50 to 100 diameters.....$20

The Educational Microscope has a japanned cast iron base, inlaid with soft rubber pads on the under surface, on which the weight of the instrument rests, thereby neutralizing any tremor or vibration communicated from surrounding objects, and preventing the instrument from slipping or sliding. Solid brass pillars, supporting axis for the arm which carries the body tube. Rack and pinion for coarse adjustment. Fine adjustment as above described. Revolving diaphragm below the stage, concave mirror, which may be arranged for either central or oblique light. One eyepiece "B", two objectives, 2 inch and 4/10 inch, upright walnut case...$30

The Research Microscope is constructed after an entirely new pattern. It has a neatly japanned iron arm and base, the latter inlaid with soft rubber pads, and of such construction and weight as to couterbalance the instrument at any inclination of its body. Finely finished brass pillars supporting the axis, which permits the body to incline at any angle. The tube has nickeled inner draw tube, giving a range of three inches. Coarse adjustment by rack and pinion; fine adjustment by micrometer and screw acting on our patent fine adjustment. This new style of fine adjustment is a peculiar feature of all our higher priced microscopes. It consists of two parallel blades of thin spring steel, placed one above the other , each fastened with one end to the arm, with the other to the body, and acted upon by a fine micrometer screw attached to a lever protruding from the body, by means of which the latter may be raised or depressed, with extraordinary delicacy of adjustment. It has no lost motion, and, having no friction, is not liable to deterioration. The stage is made of brass, and is made as thin as is consistent with firmness and freedom from tremor. The mirror bar is hung on a point placed above the stage and between this and the arm. It swings to any obliquity and any angle above the stage for the illumination of opaque objects. With 1 "B" eyepiece and two objectives, 1 inch and 1/4 inch, camera lucida, and black walnut case....$45

Student's microscope - The stand of this microscope is constructed with a japanned cast iron foot, nicely finished, inlaid with soft rubber pads. Brass pillars, which support the axis in such a way as to allow the body to be inclined to any angle, the instrument remaining well balanced in all positions of the body. Brass arm, coarse adjustment by sliding tube, the latter nickel plated; fine adjustment by fine micrometer screw acting upon our patent movement described above. The stage is supplied with spring clips and with an adjustable shoulder to vary the position of the object slide on the stage, and to keep it parallel to the latter. Plain and concave mirrors, arranged so that their distance from the object may be varied, and adjustable for oblique light; revolving diaphragm under the stage. Two eyepieces, "A" and "C", the latter arranged with a slot to receive eyepiece micrometer. Eyepieces furnished mounted either in hard rubber or brass, at the purchasers option. Two objectives, 3/4 inch and 1/5 inch, camera lucida and eyepiece micrometer, walnut case.....$50

Student microscope, as above, but with rack and pinion coarse focus and substage accessory holder fitted with removable diaphragm...$60

Student microscope, as above, except for the stage, which consists of a solid glass plate resting on two brass pieces joined to the arm. This glass plate is provided with a movable metallic slide holder, which serves as a substitute for the so-called mechanical stage. It is of very light weight and rests on the surface of the immovable glass stage on only four small points protruding from the plate, while the prolongations of the latter, bent downward and backward, and acting as springs, press against the underside of the glass plate with just sufficient force to keep it in its place when the body is inclined. This pressure can be varied at the option of the manipulator. Spring clips are provided to hold the object slide. This construction of the object slide carrier, in combination with the smoothness of the surfaces of the glass stage, reduces the friction to a minimum and renders the movement of the former very delicate, smooth and firm. Two small knobs on the slide carrier facilitate the movement. The slide carrier can be detached from the stage, if desired. The substage consists of a brass ring, joined to the brass pieces supporting the glass stage, and is of standard size. A revolving diaphragm is fitted to the substage....$70

Physician's microscope - The stand of this microscope is firm and well balance, finely finished, and of superior workmanship throughout. It is a microscope best adapted for use by physicians and students of histology, and it is extensively used at present by professional men, and in many of our most prominent institutions of learning. Heavy japanned cast iron foot, of neat design and finish, inlaid on the under surface with three soft rubber pads. Strong brass pillar and arm, both connected by a well fitting joint which allows the body to incline to any angle. Pillar and arm so marked as to indicate the correct inclination of the body for the use of the camera lucida. Draw tube, having a range of 2 1/2 inches, and supplied with a stop when drawn to standard length. It is nickel plated and has a firm but perfectly smooth movement. Coarse adjustment by rack and pinion, free from either lateral or lost motion. Fine adjustment by sensitive micrometer screw, acting upon our patent movement as described above. Large stand, free from tremor, and supplied with substage to receive diaphragm, polarizer, etc. The diaphragm receives three extra caps, having apertures of 1/2, 1 1/2, and 2 1/2 millimeters, and so fitted that they are in the correct center of the field and just below the plane of the stage. Two eyepieces, "A" and "C", the latter arranged with a slot to receive eyepiece micrometer. Eyepieces furnished mounted either in hard rubber or brass, at the purchasers option. Two objectives, 3/4 inch and 1/5 inch, camera lucida and eyepiece micrometer, walnut case.....$60

Physician's Microscope - This stand is of the same general construction as the above instrument, with the exception of the stage, which consists of a solid glass plate, as described earlier, with the difference that the substage is fitted into the glass plate by a Society screw. This arrangement prevents any light from below being thrown upon the objects, except through the central opening of the diaphragm....$65

Large Student Microscope - This microscope is designed for the use of higher powers the more delicate microscopical investigations. It has a heavy cast iron foot, neatly japanned, inlaid at the underside with soft rubber pads. Solid brass pillars supporting axis, the latter and the pillars so marked as to indicate the proper inclination of the tube for using camera lucida. Brass arm, carrying body tube and supporting glass stage, as described above. Coarse adjustment by rack and pinion, fine adjustment by sensitive micrometer screw acting on our patent movement as described above. Plane and concave mirrors, with substage of standard size, revolving diaphragm fitted into and separable from latter, all attached to the swinging mirror bar, the axis of which is placed on the level of the object, so that diaphragm and mirror swing concentrically around the same. Mirrors movable on the mirror bar to and from the object, and can also be entirely detached. Three eyepieces "A", "B" and "C", mounted either in hard rubber or brass, and the "C" eyepiece arranged with slot for the micrometer. Three objectives, 2 inch, 3/4 inch, and 1/6 inch immersion. Walnut case....$90

The Professional Microscope - This instrument is provided with a heavy brass foot, highly finished, inlaid with three soft rubber pads at the under surface. Two solid brass pillars support the axis for inclination of the body. Two strong screws with milled heads, placed at the ends of the axis, serve to tighten or loosen the connections by means of which the arm can be made to move with more or less ease. Coarse adjustment by rack and pinion, moving a long prismatic slide accurately fitted, attached to the body, and arranged for compensation of wear. Fine adjustment by micrometer screw with milled head, silvered and graduated, acting upon our patent movement described above. Glass circular stage with slide holder, fitted to receive the hemispherical immersion condenser. In this stage, we gain thinness, while still maintaining its stability. The slide carrier moves in any direction and also revolves. Substage and mirrors are fastened to the swinging mirror bar, the axis of which is fixed in the plane of the object, thereby permitting the accessories and the mirror to swing concentrically around the object. The mirror may be brought to any obliquity and swung above the stage for illumination of opaque objects. The mirror, as well as the substage, can be moved on the mirror bar to and from the object, and both can be removed altogether, in an improved manner. The substage ring receives the revolving diaphragm, condenser, etc., and the auxilliary ring with internal Society screw, which accompanies this instrument, and to which objectives and other auxilliaries may be fitted. Three periscopic eyepieces, "B", "C", and "D", the latter arranged with slot for micrometer. Four objectives, 2 inch, 3/4 inch, 1/5 inch, and 1/8 inch immersion, adjustable for cover correction. Hemispherical immersion condenser, range of magnifying power from 30 to 800 diameters. In upright walnut case....$200