Abstract: In a camera which has an automatic focusing device and is arranged to permit a change-over from one focal length of the photo taking optical system thereof to another, the focusing position of the automatic focusing device is arranged to vary in response to the focal length change-over of the photo taking optical system, so that the focusing operation can be always carried out appositely to the selected focal length of the optical system.

Abstract: The disclosed tachograph writes work data for motor vehicle work into a microprocessor-controlled EEPROM semiconductor memory mounted on a movable data card carried by the driver. A printing device prints out the content of a data card memory in the form of a tabular drive record in plain language. The face of the tachograph includes receiving slots located next to one another for the data cards of a driver and a co-driver, as well as a line display for guiding the driver as to how to key in information. A front slot in the face of the tachograph receives an unimprinted paper sheet. Two keys enter the work times, while the functions concerning the print-out of the driving record are controllable with a keyboard on the basis of information on the line display.

Abstract: A conversion lens upon attachment on the image side of a master lens increases the focal length of the entire system. The conversion lens comprises three components of negative, positive and negative powers in this order from the front, has a negative power as a whole, and satisfies the following conditions:2.0<f1/f3<4.00.8<.vertline.f2/f3.vertline.<1.2n1-n2>0.15where fi and ni are the focal length and the refractive index of the glass of the i-th component counting from the front respectively.

Abstract: An airfoil particularly suited for use in rotor blades of large wind-driven ower plants is formed in three modular sections including a nose or leading section, a spar section and a trailing section, each separately formed and subsequently assembled. In the method of the invention the spar section is formed in two separate mold units which are configured to form part of the upper and lower aerodynamic profile of the airfoil and the two spar section units are trimmed along a junction plane and then joined together at the junction plane to form the spar section of the airfoil.

Abstract: The clutch disc for a motor vehicle friction disc clutch comprises a hub part from which a hub flange provided with radially outwardly protruding teeth protrudes radially. A disc part provided with clutch friction linings which comprises an annular disc provided with radially inwardly protruding teeth is mounted rotatably on the hub part. The teeth of the hub flange and the annular disc engage in one another with play in the circumferential direction. The annular disc and the hub flange comprise at least one pair of mutually radially opposite apertures each having two stop faces directed towards one another in the circumferential direction. The stop faces, preferably of the annular disc extend over substantially the entire radial height of a spring arranged in the aperture of this part. The spring is supported on the stop faces of the other part through a retaining stirrup piece which is U-shaped seen in the circumferential direction.

Abstract: In the disclosed device, a beam splitting member splits the light reflected from an object to be photographed into two parts. One part of the split-off light is reflected back through the beam splitting member to a photoelectric transducer. An output signal from the photoelectric transducer is used for focusing adjustment.

Abstract: A fluid cooled neodymium phosphate glass impulse laser comprising a passive release circuit. The laser may be designed with reduced size so as to be portable and is mainly used in medicine particularly for eye operations, in spectroscopy, in cosmetics, teaching and microtechnology. The proposed laser comprises a resonator of small size having a fluid cooled laser body and which may be disassembled without detuning the resonator, a closed cooling circuit, a supply unit of small size and low consumption and an electronic circuit. The resonator comprises a thick passive release composed of a F/2 center-colored LiF crystal and having a characteristic passive transmission power of 70%, a high reflection coefficient mirror and a partially reflecting output mirror having a characteristic transmission of 60%. The active material is composed of a phosphate glass bar of small diameter, generally 3mm, having a high concentration of Nd ions, generally from 1.2 to 1.4.times.10.sup.21 ions/cm.sup.3.

Abstract: A plurality of preliminary illumination type flash units are connected to a camera and arranged so that for the preliminary illumination, all the units are fired at a time, but photographic information from only one of the flash units is transmitted to the camera, thereby a proper aperture value is selected automatically.

Abstract: A process of and a device for power- and air-conditioning fresh air generation in an aircraft, which are equipped with main power plants and an auxiliary power unit driving an air-conditioning compressor, both of which are supplied with air-conditioning exhaust air from the passenger- and/or pilot cabin and/or with exhaust air from the boundary layer suction for the purpose of economical operation.

Abstract: This invention relates to DC solenoid actuator circuits.A DC solenoid winding located to act on an armature, is connected across a rectifier connected to an AC supply. A capacitor is provided across the winding so that the initial voltage applied to the solenoid winding is greater than the average actuating voltage.One terminal of the rectifier is connected to the AC supply via a switch which can either include in that circuit a capacitor or shunt that capacitor. The switch is mechanically linked to the armature of the solenoid winding so that at a predetermined point during the stroke of the armature the switch is operated to include the capacitor in the circuit so as to lower the actuating voltage for the solenoid.

Abstract: The friction clutch for a motor vehicle comprises a fly-wheel having a clutch cover on which a diaphragm spring is supported through retaining bolts. The retaining bolts axially displaceably pass through the diaphragm spring and the clutch cover and are secured on the side axially remote from the diaphragm spring on a plate spring which is supported on the clutch cover. The plate spring carries all retaining bolts and concentrically surrounds the rotation axis of the clutch. The plate spring ensures play-free clamping in of the diaphragm spring. The plate spring is preferably independently centered on the clutch cover so that the passage openings of the retaining bolts can be of such large dimensions that no friction occurs.

Abstract: A flat jet nozzle for spraying coolant on a continuously conveyed billet with a wide angle spray along the width of the billet is formed with a cylindrical wall having a discharge slot extending in the circumferential direction of the cylindrical wall, with the slot having a width which increases from the middle of the slot toward the outer sides thereof.

Abstract: A self-timer device which announces its operation with sounds, and in which the sound volume or loudness changes in accordance with environmental sound or exterior noise around the camera so as to always tell the operator with a proper sound that the self-timer is in operation.

Abstract: In the disclosed distance measuring device a light source projects light on an object to be photographed. A photo-electric converter for receiving light reflected from the object includes at least one photo-electric converting portion whose electric charge varies according to the quantity of light incident thereon. A control includes a first electric charge store which stores an electric charge produced at the photo-electric converting portion while the light is projected from the light source, a second electric charge store which stores an electric charge produced at the photo-electric converting portion while light is not projected from the light source, and a detector which detects at least one of the amounts of electric charge stored at the first and second electric charge stores. The control varies the quantity of light projected by the light source on the basis of the result detected by the detector.

Abstract: New organosilicon compounds of the formula ##STR1## R represents a hydrogen radical with 1 to 6 carbon atoms, or a phenyl radical;R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and represent hydrogen or methyl radicals;R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are the same or different and represent hydrogen, fluorine or hydrocarbon radicals with 1 to 8 carbon atoms, or fluorinated hydrocarbon radicals, in which at least one R.sup.5, R.sup.6 R.sup.7 or R.sup.8 radicals must be a fluorine or a fluorinated hydrocarbon radical;Y is a hydrolyzable radical, hydroxyl radical or organosiloxanyl radical;A represents ##STR2## in which R.sup.9 may be the same or different and represents a hydrogen or a methyl radical; anda has a value of 0, 1, 2, or 3.

Abstract: An encapsulated electrostatographic toner material preferably employable in a pressure fixing process and improved in the fixability after storage of the toner material comprising a core and a shell enclosing the core, in which:said core comprises, a polymer, a solvent having a boiling point of not lower than 180.degree. C. which is capable of dissolving the polymer or causing the polymer to swell, a colorant and a particulate magnetizable substance hydrophobically treated or coated on the surface; andsaid shell is prepared by an in-situ polymerization process such as an inner polymerization process or an outer polymerization process.

Abstract: An expansion dowel includes an axially elongated sleeve-shaped dowel body slit in the axial direction from the leading end. A spiral-shaped expansion body is located in the dowel body in the axially extending region of the slit. By axially displacing the expansion body toward the leading end of the dowel body it widens radially outwardly and in turn expands the axially slit region of the dowel body providing the required anchoring effect.

Abstract: In the formation of a crankshaft, such as used in small gasoline motors for lawn motors, chain saws and the like, separately produced crank webs, shaft pins and crank pins are used to form an integral crankshaft. Initially the various parts are shaped to the desired dimensions. The crank web can be stamped from a metal strip or it can be a forged sintered part. A shaft pin is inserted in sliding contact with an opening in a crank web and then the two parts are secured together by pressure welding. Another crank web and shaft pin are assembled in a similar manner. The two webs are then interconnected by a crankpin positioned in another opening in each of the webs and a connecting rod is installed on the crankpin.

Abstract: A conductor device having at least one spiral which is formed from at least one conductor, each conductor consisting of wires which are stranded together to form a bundle. In addition, the wires belonging to a conductor can all consist of the same material or of different materials, one of which has a large breaking strength and the other one having high electric conductivity. The conductor device can connect, for example, in a heart pacemaker, the contact electrode inserted in the heart with an electric pulse generator. The conductor device provides a relatively high electric conductance with great flexibility, expandability, breaking strength and, in particular, fatigue resistance.