Abstract: In an automatic focus detecting device in which a vibrating prism is provided on the focal plane of an objective of an optical instrument such as a camera, a photodetector element used for detecting focus is composed of a central element functioning as a main photodetector and a marginal element or elements functioning as a sub-photodetector. The marginal element detects the vibration of the image of a non-principal subject matter existing in the vicinity of a principal subject matter. The central element detects the vibration of the image of the principal subject matter. The output of the marginal element is used to compensate for the noise in the output of the central element.

Abstract: A rotary roller bit for drilling earth and rock formations, having a main body and three legs extending outwardly therefrom. Each of the legs carries a conical roller cutter with internal bearings and there is a seal around the periphery of the top of the roller cutter. The periphery of the roller cutter is spaced from the adjacent portion of the leg so as to provide a jet slot for the discharge of air. Adjacent the slot and radially inwardly is an air chamber which is formed between an annular surface of the leg and a seal ring. The air chamber is substantially greater in its dimension axially of the roller cutter and air is supplied to it under sufficient pressure to cause a jet of air to flow from the jet slot at a sufficient rate to prevent the entry of rock particles and dirt into the roller cutter.

Abstract: A roll of embossed paper towelling in which the embossing comprises lands and valleys between the lands wherein the lands are in rows extending at an acute angle to the longitudinal direction of the towelling. The acute angle of the rows of lands offsets each land with respect to the lands of the next adjacent turns or layers of the towel in the roll. That causes the layers to be held apart, and the desirable characteristics of the towels are preserved. There is also apparatus and a method for producing the embossed paper towelling. An embossing roll has a continuous spiral row of embossing elements or patterns which produce the embossing on the towelling. The spiral rows are at an angle of the order of five degrees from the longitudinal edges of the towels, i.e., the edges extending in the direction of the embossed sheet.

Abstract: A new product in the form of high tensile strength belting, and the method of making the same. The product is high tensile strength oriented nylon bonded to a layer of rubber on one or both faces. A sheet of nylon film is bonded to one face of a sheet of rubber, and the layer of nylon film on the sheet of rubber is then bonded to a sheet of oriented nylon with an adhesive which bonds the two nylon surfaces together.

Abstract: A pan retriever dolly transfers stacks to a stack conveyor. The dolly includes a retriever arm with a magnet and is mounted for reciprocating movement across the stack conveyor towards and away from the storage conveyor.

Abstract: A pigment coated phosphor used as a green emitting phosphor for a high contrast color television cathode ray tube. A green emitting phosphor is coated with TiO.sub.2 --ZnO--CoO--NiO system pigment particles.

Abstract: A casing for a retractable type tape measure includes a coil spring secured to the rule of the tape measure. The casing has an outer shell and a central interior mounting structure for attachment to the inner end of the coil spring. The mounting structure comprises a specially constructed guide post for guiding the inner end of the coil spring in a smooth relatively large radius curve about the mounting structure to the first inner turn of the coil spring, thereby to avoid sharp bends in the spring and permit the use of unannealed spring steel to form the spring.

Abstract: In a data printing device built in a camera body, the data carrying disc is located close to the bright frame in the viewfinder optical system so that the data may be viewed together with the bright frame in the viewfinder without an additional diopter correcting lens. The data carrying plate consists of a number of discs carrying different data of different diameter so that the data carrying portions of the different data carrying discs may face to the film in the camera directly, namely without any intervention between the data carrying portions and the film, whereby sharp images of the data are printed. A light intercepting plate is provided in parallel to the data carrying discs to selectively print the data.

Abstract: A method and apparatus for producing sheets of plastic having precisely controlled thickness. Two endless steel belts are positioned to provide coextensive runs between which there is a press-gap of uniform thickness. Each of the belts is provided throughout the treatment zone with a back-up pressure structure formed by a continuous array of rollers positioned along each of the belts and a back-up plate structure which is positioned to provide a precisely controlled gap for the rollers. The rollers are turned by the contact with the belt and roll along a path throughout the length of the treatment zone. Heated liquid is passed through the plates to control the temperature of the product being treated. Each of the plate structures is held against its array of rollers by a plurality of steel bearing strips, the transverse dimension of each of which is controlled by passing a heated liquid through it.

Abstract: A press for producing continuous sheets, for example, that which is fabricated into circuit boards for printed electrical circuits. There are two endless steel belts, each of which is mounted on a pair of drums or rolls which support the belts so that there are coextensive belt runs which define a treatment zone in which the product is formed. The coextensive belt runs are held in precisely spaced relationship by a pair of pressure plates which may also act as heating plates. Each of the pressure plates is supported from the press structural members by a plurality of support strips which are positioned in rows longitudinally of the treatment zone. The strips of one of those rows adjacent each of the longitudinal side edges of the treatment zone are wedge units. Each wedge unit is adjustable to flex the edge of the support plate and change the thickness of the press-gap in that area. In that way, it is possible to produce a product having precisely controlled uniform thickness throughout.

Abstract: In a photographic camera having a built in data printing device with an optical axis of a focusing lens of the device inclined at an angle with respect to the optical axis of the taking lens of the camera. A plurality of data carrying plates carrying different indicia are positioned parallel to the surface of the film loaded in the camera and on which the data are to be printed. The sizes of the indicia carried by the different data carrying plates are of different sizes from each other so that the sizes of the images printed on the film are equal to each other.

Abstract: In a flash discharge device including a strobe tube attached to a camera body, use is made of both the positive and negative outputs of a blocking oscillator. One output is used for charging a main capacitor to supply power to actuate the strobe tube, and the other output is used for energizing one or more indicators. Both the outputs may be used to accelerate the charging of the capacitor. The indicator energized by the output of the blocking oscillator while the main capacitor being charged may be an indicator which indicates that condition by intermittent lighting.

Abstract: An equapoised arm assembly is counterbalanced by springs enclosed within tubes that are components of the arm assembly. The arm assembly has a lower pair of parallel arms which are pivoted at their lower ends to a swivel bracket that turns about a vertical axis in a fixed bracket. Each of these arms is pivoted at its upper end to a floating bracket that is pivoted to a similar upper pair of parallel arms. An article support bracket is mounted upon the other end of the upper pair of arms and may include a universal joint assembly. The arms are tubular and each pair forms a parallelogram by virtue of the pivotal connections with the respective brackets. A coil spring is enclosed within one arm of each pair of arms to exert a counterbalancing effect upon its pair of arms. A nylon shoe is connected to at least one end of each spring and is slidable within the tube.

Abstract: A method for pelletizing liquid and viscous products. A body of the liquid or viscous material is enclosed within a chamber having discharge orifices or nozzles at the bottom of the body of liquid. There is a body of gas above the liquid which is subjected alternately to increased and decreased gas pressures so that the pressure on the body of liquid is first above and then below atmospheric pressure. That causes the product to be discharged from the orifices in droplets. The droplets are then solidified to form pellets. A predetermined liquid level is maintained within the chamber. The changes in gas pressure are produced by operating a valve which connects the body of gas in the chamber alternately to a suction line and supply line for gas under pressure.

Abstract: An image transmitting optical fiber bundle has at an end of it a field stop for defining the size of image viewed thereby. The field stop is sandwiched between a pair of transparent thin plastic films. The pair of films which sandwiches the field stop is fixed to an end of the optical fiber bundle. A face plate is further fixed on the pair of films on the end face of the fiber bundle. Since the surfaces adhered are all flat, the formation of bubbles in the adhesive is easily precluded.

Abstract: Method and apparatus for cooking products such as french toast in which the uncooked product is placed on one end of an endless steel belt upon which it is carried while being cooked. The product passes through a first cooking zone to cook it on one side, and it is then turned over and passes through a second zone in which it is cooked on the other side. The turning operation is performed by a flipper positioned between the two cooking zones which pushes spatula means under the product with a movement against the movement of the conveyor. The spatula is then swung about an axis transverse to the movement of the conveyor and directly above the cooking surface, and the product is turned or "flipped" along an arcuate path progressively with respect to the movement of the conveyor.

Abstract: An apparatus and method for producing sheets of bitumen in which a layer of liquid bitumen is deposited on a steel belt conveyor and is solidified to form a continuous web. The web is stripped from the conveyor and passes downwardly by the action of gravity to a cutting assembly which cuts the web into lengths to form sheets. The sheets are then stacked upon a discharge conveyor and are adapted for packaging.

Abstract: A light emitting indicator for a camera includes an absolute value circuit for increasing the brightness of the light emitting indicator element with decrease of the scene brightness when the scene brightness is below a predetermined level. Thus, the amount of light emitted from the light emitting indicator and falling on the photocell detector is increased to compensate for the undesired decrease of the total amount of light incident upon the photocell detector which would otherwise result in measurement of too low scene brightness. This increasing light from the indicator element precludes the setting of an undesirably extended period of exposure time.

Abstract: A tank for holding liquefied gas and including a support in the form of a vertical skirt which forms a structural unity with the tank wall. The vertical skirt has an intermediate belt or zone in the region between the transition to the tank wall and the foundation, said zone being made of a bearing material which has the properties of poor heat conductivity relative to that of the material comprising the tank wall and the rest of the skirt, a thermal expansion coefficient which lies between the values for the other skirt materials, and the ability to withstand low temperatures, said zone being thermally insulated.

Abstract: A system and method for removing colloidal suspensions or particles from a liquid, in particular tall oil soap particles from black liquor of a wood pulping process. Black liquor is moved along a flow path from an upstream to a downstream zone. First and second electrical conductors are respectively located in the upstream and downstream zones and means are provided for applying opposite electrical potentials to these conductors. For removal of anionic colloids, the first conductor is made positive and the second conductor negative. Thus, colloidal particles in the liquid having a relative potential opposite to the potential of the first conductor are attracted towards the first conductor as the liquid flows through the upstream zone, and some of the ions attached to some of these particles are stripped off by the electrical field, leaving these particles with a potential of the opposite polarity from particles not so affected.