Dry grinding of the jet and anvil type is improved by removing partially ground material from the grinding chamber and then re-injecting it into the chamber against a plurality of rotating anvils. The grinding procedure is further enhanced by removing a portion of the gas carrying the material so as to reduce the load which must be accelerated by the jet.

A holographic method and apparatus for storing and retrieving information only by authorized persons, particularly used for identifying the bearer of a record of such information, comprises storing the information on a record medium as a hologram, scrambling the image of the information on the hologram so that it cannot be recreated except by authorized persons using a master code, and then recreating the scrambled holographic image using apparatus that eliminates the effect of the master code. ...

A device for teaching fractions and their equivalents comprising a web of material having a plurality of horizontally disposed lines extending across it. The lines are divided into segments with each of the lines being divided into a different number of segments corresponding to different fractions. Means are provided for moving the web past a window whereby each of the lines and the fractions thereon may be observed by the student.

The invention relates to a programming process and device which provides a cyclic supply of sequences proportional to a given fractional part of the actual duration of a working cycle, particularly of a machine, such sequence being set by the signals produced by two sensitized units, both of which can be either in a sensitized state or in a nonsensitized state.

A display fixture for textile products such as bedspreads is disclosed. The fixture has the top a sloping display rack divided by removable partitions. At one end the fixture has a sloping display bin with a drawer provided at the other end. Two or more such fixtures may be provided on a common base.

A passive ferromagnetic detection station in which the position of the ferromagnetic object carried by a person may be indicated. A plurality of gradiometers mounted at predetermined vertical positions along two vertical members are used to sense any disturbances in the earth's magnetic field. Each gradiometer has a predetermined pattern or area of sensitivity to magnetic fields in which it senses disturbances in the earth's magnetic field. In a preferred embodiment the sensitivity patterns may ...

A transducer generates a signal whose amplitude corresponds to the vibration amplitude of a machine under test. The output of the transducer is passed to a comparator which gives a logic 1 output when the transducer output signal lies outside an acceptable range, and a logic 0 output when it falls within the range. If a logic 1 output occurs, the length of time for which it persists is measured and, if it persists for greater than a preset time, an alarm is actuated.

An enabling circuit selectively generates first, second and third enabling signals. The first enabling signal enables a pulse generator means which generates a train of clock pulses. The second enabling signal enables a gating means which applies the clock pulses generated by the pulse generator means to the up input terminal of an up/down counter. The third enabling signal enables a gating means which applies the clock pulses generated by the pulse generator means to the down input terminal of ...

Cocoa flavored syrups having a high cocoa content and excellent stability and flow properties at room temperature may be produced by using an amylolytic enzyme and a sufficient proportion of Dutch process cocoa to provide a syrup pH of 5.5 to 7.5. The syrup is made by alternate addition of cocoa and sweetener to sufficient water to achieve a solids content of about 58 to 65 weight percent, adding an amylolytic enzyme, heating to a temperature of about 175.degree. to 185.degree. F. for at least 1...

A reclining chair has a frame and a seat fixedly and immovably secured to the frame. A back is pivotally mounted to the rear of the frame and extends downwardly beneath the seat. A leg rest is pivotally mounted to the front of the frame and includes an inwardly curved portion at the top thereof which extends beneath the seat. The lower part of the back is connected to the curved portion of the leg rest through a link member such that movement of either the back or the leg rest imparts movement t...