Abstract: The stand for a microscope comprises a portion extended to receive the optical device and a transport handle (22) which may be retracted inside the stand.

Abstract: A liquid flow photometer for fluorescence light and/or scattered light measurement, having a measuring area (37) where particles (38) flow through. The device comprises a first objective (3) focussing excitation light (5) in the measuring area (37) and also collecting fluorescence light emanating from the measuring area (37). The first objective (3) is modified by a slightly transparent central stop (39) placed in the rear focal plane of the objective. The device further comprises a second objective (23) collecting the light falling within the conic sector (40) obscured by the central stop (39). This light contains partly scattered light and excitation light. The corresponding photo-electric signal is divided in a pulsed (AC) component and a constant or slowly varying (DC) component. The DC component serves to correct one or both of the AC components representing the fluorescence and scattered light intensity in order to make them independent of variations in the excitation light intensity.

Abstract: A reflection-reducing layer (S) between an incidence medium (E) and a highly reflecting surface (3) is described, wherein for the refractive index n.sub.1 of the incidence medium (E) and the refractive index n.sub.2 of the reflection-reducing layer (S) the relationship of n.sub.1 =n.sub.2 or at least n.sub.1 .perspectiveto.n.sub.2 is valid and the reflection-reducing layer (S) has an absorbtivity such that no reflecting radiation components are emerging from it in the direction of the incidence medium (E). The reflection-reducing layer (S), conveniently consisting of two partial layers, is preferably constructed so that the first partial layer consists of the same material as the incidence medium (E), for example, germanium, and the second partial layer of the same material as the highly reflecting surface (3), for example, chromium.

Abstract: Apparatus for at least partially compensating for the rebound impact of an automatic diaphragm in a photographic objective comprising a diaphragm control ring for driving the leaves of the diaphragm and a diaphragm preselector ring for predetermining the diaphragm aperture; the rebound impact being defined as the recoil produced according to the laws of elastic collisions when the diaphragm control ring which shuts the diaphragm engages the stop of the diaphragm preselector ring; said apparatus comprising at least one movable auxiliary mass which frictionally opposes the rebound movement.

Abstract: Device for liquid flow cytophotometer including a device for hydrodynamic focussing (4,6) of a cell- or particle-suspension towards a measuring area, and an optical excitation-and detection-system (9), preferentially based on oil immersion optics, characterized by the focussing device being formed at or in relation to the system's optical axis-rotating nozzle assembly (1) directed towards a surface (7) which is open in relation to the surrounding atmosphere and situated on the optics (9), forming the optics' measuring area, thus supplying a laminar liquid flow of the above-mentioned suspension.

Abstract: Disclosed is a comparator viewing device for simultaneously viewing objects to be compared, either macroscopically or microscopically, comprising a comparator bridge member, a pair of individual optical viewing members attached to the bridge member, each of the viewing members comprising at least one objective, a binocular tube mounted on the bridge member, the binocular tube including two eyepieces and a beam splitter interposed in a beam path between the objects to be viewed and the eyepieces, and a marking device comprising a light-emitting surface for producing a luminous spot on the objects to be viewed, this marking device being located in the beam path on the side of the beam splitter opposite the objects to be viewed, whereby the same beam path serves for viewing of the objects and also for producing the luminous spot on the objects to be viewed, and the luminous spot is always produced on the location of the object which appears in the center of the field of vision.

Abstract: An adjusting device for the specimen stage of an optical instrument such as a microscope or vernier measuring instrument comprising a pair of superposed slides mounted for movement in two mutually perpendicular coordinate directions perpendicular to the optical axis of the instrument with coaxial drive means for effecting fine adjustments of the positions of the slides and with a single, common release mechanism for simultaneously disengaging both drive means to facilitate rapid manual displacement of the slides to an approximate desired position.

Abstract: An incident light, bright-field, Kohler illuminating device for a microscope which reflects an illuminating beam into one half of the pupil of a microscope objective, which avoids vignetting of the field of vision without requiring especially short objectives, which can provide illumination with polarized light, and which can be added to any transmitted light microscope including microscopes with revolvable turrets without requiring a specially designed microscope stand.

Abstract: Disclosed is a handle adapted for grasping by the hand of an operator for operating a pivotable machine part, comprising a thumb supporting member attached to the machine part for supporting the operator's thumb and a grip part connected to the machine part for gripping by the rest of the fingers of the operator's hand. Also disclosed is a microtome embodying this handle.

Abstract: A microscope objective mount is described for screwing onto a microscope, said microscope having a tube which is rotatable around the mount and is held onto the mount. The mount is distinguished in that the tube extends over approximately the entire length of the mount, with the tube and mount being releasably connected together by a catch connection.

Abstract: Disclosed is a method for determining the axis of rotation of a rotatable table in a multiple coordinate measuring instrument equipped with at least one tracer, comprising the steps of arranging a spatial contact surface eccentrically to the axis of rotation of the rotatable table; determining the position of a point associated with the contact surface, in the coordinate system of the multiple coordinate measuring instrument by contacting the contact surface with the tracer; repeating the determination step in at least two additional different angular positions of the rotatable table; determining the direction of the normal to a plane which contains the points determined in the at least three angular positions of the rotatable table; and determining the center of a circle passing through the at least three points, whereby the axis of rotation of the rotatable table is the normal passing through the center of the circle. Also disclosed is a device for carrying out this method.

Abstract: Disclosed is a flat field lens having an image splitting effect, comprising a generally planar lens of substantially transparent material having an optical axis; and a plurality of deformations of identical cross-sectional configuration formed on concentric paths about the optical axis of the transparent lens. Each of the deformations has at least two light-refracting surfaces which are symmetrical to an axis of the deformation, wherein the axis of symmetry of each deformation lying on the same concentric path has the same inclination with respect to the optical axis, and the inclination of the axes of symmetry of deformations located on radially adjacent concentric paths varies, preferably constantly, with respect to the optical axis.

Abstract: Disclosed are novel prosthesis parts of improved properties which are obtained by providing a material as used for prosthesis with an enamel or enamel-like coating and incorporating in said enamel layer, while in a viscous state, a bio-active material. Such prosthesis parts have a satisfactory adhesive strength and coefficient of expansion, are substantially free of pores, are highly corrosion resistant, and readily grow intimately and firmly together with the bone tissue without the use of bone cement.

Abstract: A circuit for suppressing interference pulses occurring in transformers with high leakage inductance. The circuit includes current controlled switches connected to the transformers having secondary windings. The switches are controlled by a trigger circuit and a control device. The interference pulses are suppressed by a pulse suppression circuit connected between the secondary windings of the transformers and the trigger circuit. Furthermore the transformers' secondary windings are interconnected in phase to the pulse suppression circuit. The correct interconnection is controlled and/or indicated.

Abstract: Instrumentation for sensing the test values at test samples, using a mechanical sensor moving relative to the test sample and consisting of a housing fixed part and of a movable, articulating multi ball and socket part connected to the housing fixed part and at least one test value transmitter. A trigger signal is generated in the instrumentation at the instant of impact between sensor and test sample and is stored to record the test value present at the time of impact at the test value transmitter.At least one force or acceleration pickup (12,23,24,30) is provided which is mounted on the housing fixed part (2) of the sensor (5) and delivers the trigger signal.

Abstract: Fluorophosphate glass free of beryllium with a refractive index n.sub.e between 1.40 and 1.46, an Abbe value v.sub.e between 85 and 94 and a high positive anomalous partial dispersion value +.DELTA.v.sub.e between 19 and 28 is described. The glass is melted from a mixture containing as groups of components metaphosphate, fluorides and an alkali fluoroborate in certain proportions expressed in % by weight, in the following manner: the intermixed mixtue is heated to a temperature between 800.degree. and 800.degree. C., the melt refined at a temperature between 900.degree. and 1000.degree. C. for a period of 8 and 25 minutes, homogenized at a temperature between 900.degree. and 1000.degree. C. within a period of time of 5 to 15 minutes, the temperature reduced to a pouring temperature between 575.degree. and 650.degree. C. and the melt poured into casting molds preheated to approximately 320.degree. C., in particular aluminum molds.

Abstract: Disclosed is an adjustable instrument base suitable for holding optical instruments, comprising a base plate movable along first and second horizontal coordinate directions; a housing member surrounding the base plate and being movable with respect to the base plate in the first coordinate direction; first and second mechanisms mounted on the housing member for effecting displacement of the base plate in the first and second coordinate directions, respectively; a generally U-shaped stirrup member mounted on the base plate for rotation; a support plate mounted on the stirrup member for rotation about a horizontal axis; a first and preferably second instrument carriers displaceably mounted on the support plate; and a mechanism mounted on said base plate for effecting vertical displacement of the first instrument carrier.