DE38858C - Apparatus for marking microscopic parts of objects - Google Patents

Description

IMPERIAL

PATENT OFFICE

CLASS 42: Instruments.

The purpose of the present apparatus is to make the often difficult retrieval very fine Objects, especially those which are enclosed in thicker layers of tissue, to facilitate. Its handling is simple and not very time consuming. You screw it on Place the objective in the microscope tube, lower it with a diamond splinter or Another glass-cutting body provided with the drawing tip on the cover glass and rotates the upper sleeve at its projecting edge once around its axis; the eccentric one The pen makes this movement and describes a fine circular line on the Cover glass surface.

The set-up of the apparatus is as follows: The spigot B , made of hard-drawn nickel silver wire, is firmly connected to the tube screwing head A and formed into two cylinders a and c, which are unequal in length and diameter. The short screw thread b is located at the point where the two cylinders meet. A rotating sleeve C placed over the upper cylinder α is held in place by the screw nut b ^l , but in such a way that the easy and free rotation about its axis is in no way hindered. This rotating sleeve has the protruding edge d, which engages in the form of a jacket over the head of a second sleeve D rotating on the lower thread c and is connected to the same by the screw pin m in such a way that, when the sleeve C is rotated about its axis α , the lower D participates in this rotation. The slotted hole located in the overlapping edge at m allows the guide screw to slide freely up and down, including that of the sleeve D and the pen i connected to the latter. This device has the double purpose of making the unavoidable pressure from above for the drawing pencil ineffective when moving the rotating sleeve, and of avoiding the diamond tip too strongly on the cover glass surface when lowering the tube. The drawing pen is fastened in the slide piece h , which can be moved in its bearing located on the front part of the sleeve D by the screw f and in the opposite direction by the spring g . By adjusting the marker pen to a greater or lesser extent from the axis, it is now possible _{to draw circles of different diameters, from Y 4} to 2 mm, depending on the requirements.

When using this instrument, FoI ^ to observe: If one has discovered a place in the object under high magnification, on their safe retrieval - be it for a more detailed investigation, be it for Demonstration or for a photograph - is convenient for the observer, so will after the preparation has been clamped on the specimen table, as precisely as possible into the Slid in the middle of the field of view, then removed the object and attached the apparatus. Now the tube must be lowered so far that there is still a small space between the tip of the drawing and the surface of the cover glass remain. The further approach, similar to the use of strong objectives, caused by the micrometer screw at

Claims (1)

which process it is expedient to observe through the magnifying glass whether the screw pin m rises in its guide gap, that the tip of the drawing has touched the surface of the cover slip. If this is the case, the easiest way is to set the sleeve c in a rotating motion at its protruding edge e with both index fingers, after which manipulation a fine circular line concentrically encircling the object portion remains on the cover glass surface. The latter can be clearly seen even with a weak magnifying glass, even if the diamond tip has only been rotated once. When using oil immersion, however, it is advisable to repeat the rotation a few times, or, if the oil substance is thick and tough, to increase the pressure on the diamond point by means of a small fork-shaped piece of lead by means of a slight load. A few attempts are sufficient to determine the most suitable for different applications. If there are other noteworthy parts in a specimen besides the already marked area, which make different designations desirable because of their content or their higher image sharpness, then these can easily be produced by writing on two or three concentric rings; only a small one is required for this Adjustment, about ^] / _{] 0} turn on the slide screw f. A few more words remain about the retrieval of such marked ones Object locations. With the help of a hand-held magnifying glass, they are over narrower on the object table The diaphragm should be arranged in such a way that it is possible to see it with a weak objective magnification It only takes a little further help to move the mark into the center of the field of vision in order to then continue to work with a higher magnification. Regular, precise introduction of the object in the correct position is, of course, conditioned by the fact that all the screwing pieces are precisely worked and free of dirt. This, however, is a requirement that is the same for every other apparatus or similar purposes. Patent claim: A marking apparatus for microscopic objects to be attached to the microscope tube, consisting of the sleeve C rotatable around a pin attached to the tube head, as well as the sleeve D mounted around an extension of the pin, which carries the pen i , which can be moved laterally, and which moves up and down Dressing device can move independently of C , while the same must follow the movement of sleeve C when it rotates. For this purpose ι sheet of drawings.