Microtomes.
Reading edition
Large Sliding-Microtome.
Our larger microtomes are heavy and all their adjustments are of the most accurate construction, the result being that they are very steady when in use and permit the cutting of very thin and uniform sections.
They are to be had in three different sizes. The larger two are slightly different in construction from the third. The two former microtomes are provided with an automatic feed attachement. A heavy knife-carrier slides smoothly and rapidly on a horizontal track and is so arranged that it may be manipulated by the hand of the operator alone or by a wheel and chain device, which tends to assure a perfectly uniform stroke of the knife.
The objectclamp is raised vertically by a micrometer screw. This motion is accomplished by turning a large disc having teeth cut into its periphery and a turn of one tooth being equal to an elevation of 0.0025 mm.
The automatic feed is arranged as follows: With each return of the knife-carrier to the end of its track pressure is made upon an adjustable lever which regulates the motion of the micrometer wheel. This device may be so adjusted as to move the micrometer disc any number of teeth from one to ten with each sweep of the knife.
Three different forms of clamps may be had for these microtomes, and freezing apparatus as well as paraffin tables can also be fitted.
The Fixed clamp, No. 128, represented in the figure of the large sliding microtome, serves to clamp the specimen in position and does not allow any further adjustment.
The Ball and Socket clamp permits the adjustments of the specimen after it is held in the clamp by means of a ball and socket joint—see figure of No. 129—a set-screw then holds it firmly in position.
The Naples clamp permits the accurate adjustment of the specimen at any level, the clamp being supported on two horizontal axes at right angles to each other, the one controlled by rack and pinion, the other by endless screw.
The knife-carrier is arranged to hold the Thoma form knives, which are fastened by means of a wing-screw. Other knives require a special holder, such as No. 139.
No. 122. The Large Sliding Microtome has a track 42 cm long. Its price with automatic feed attachement, wheel and chain arrangement for the knife carrier, and fixed clamp, without knife $62.—
No. 123. The same, with knife holder for Jung microtome knives $66.—
No. 124. The same, but without the wheel and chain arrangement for the knife carrier $50.—
No. 125. Medium size Sliding Microtome—Track 32 cm long; automatic feed attachement; wheel and chain motion of knife carrier and fixed specimen clamp—without knife $56.—
No. 126. The same, with knife holder for Jung microtome knives $60.—
No. 127. The same, but without wheel and chain motion $44.—
No. 128. Fixed Specimen Clamp $4.—
No. 129. Ball and Socket Clamp $6.—
No. 130. Naples Clamp $12.—
Ball and Socket Clamp No. 129. Naples Clamp No. 130.
No. 131. The Support-Microtome has a track 19 cm long. The knife-carrier slides on a double flanged support and is moved by means of a large knob. The motion is smooth and quick. The specimen is held in a clamp supported on two adjustable axes at right angles to each other, thus permitting its adjustment in any position. The specimen carrier is moved vertically by means of a micrometer screw to which a large disc is attached. This disc is graduated, each degree representing a motion of the specimen carrier of 0,005 mm. The price of this microtome with knifeholder No. 139, without box or knife is $34.—
Support-Microtome No. 131.
No. 131a. Small Sliding Microtome, length of bed 21 cm, heavy knife-carrier, object clamp for specimen 25 mm diam., micrometer screw with disc graduated into 100 degrees, each division representing a motion of 0,005 mm. Price including knifeholder No. 139, without knife $24.—
Small Sliding Microtome No. 131a.
Microtome knives.
(Made by W. Walb.)
A. Thoma's Model, plano-concave, with handle adapted for clamping immediately to the knife carrier of the microtome, in box.
No. 132. Length of cutting edge 36 cm $26.50
No. 133. " " " " 24 cm $13.25
No. 134. " " " " 16 cm $8.50
No. 135. " " " " 12 cm $5.50
B. Jung's Model—plano-concave—requires knife-holder No. 139—in box.
No. 136. Length of cutting edge 24 cm $11.25
No. 137. " " " " 17 cm $6.—
No. 138. " " " " 12 cm $4.75
No. 139. Knife-holder designed for Jung's Microtome knife $4.—
No. 140. Freezing apparatus for Microtomes $8.—
Freezing apparatus No. 140.
Hand Microtomes.
No. 141.
No. 141. This Hand Microtome, shown in the figure above, screws to the edge of the table. The specimen is held in a clamp which may be removed from the instrument, and which is raised by a micrometer screw to which a large disc is attached, the edge of which is milled and graduated, each degree of the graduation representing an elevation of the specimen of 1/100 mm. The knife is manipulated by hand and in cutting slides over two narrow glass plates which serve as a track for it. The length of this track is 7 cm $12.—
No. 142. Cylinder Microtome. The specimen is held by means of a clamp-screw in a hollow cylinder. This entire cylinder is raised within another cylinder which bears the cutting table by means of a screw with milled and graduated head. Each division of the graduation represents a motion of the inner cylinder of 1/100 mm. In cutting the edge of the knife is made to pass over the surface of the glass cutting table, the diameter of which is 7 cm $6.—
Cylinder Microtome.
No. 143. Microscopic section-cutter—razor form—of best quality, plano-concave, for microtomes No. 141 and 142 $1.25