Abstract: A light distribution louver for a lighting fixture wherein the louver together with supporting apparatus closes at least the bottom of the light fixture. The louver may be of unitary construction or preferably formed of individual louver sections or sectors depending upon the shape of the supporting apparatus. The louver sections or sectors may have fixed or movable vanes and in the case of sections, they may be positioned in a variety of orientations to attain varied light distribution characteristics. The invention further contemplates a structure wherein the supporting apparatus encloses the lighting fixture to afford more complete protection.

Abstract: A smoke detector having a housing including openings for admission of smoke, a smoke detecting chamber within said housing with the wall of said chamber formed of spaced overlapping elements which form a serpentine path therebetween, means on one side of said chamber for emitting light into said chamber, a light detector adjoining and shielded from said light source and a conical reflector in said chamber and on a side opposite said light source and detector.

Abstract: The method and apparatus for manufacturing an artificial tooth crown which involves the formation of a metal crown, coating the crown with porcelain materials and subjecting the coated crown to high frequency vibrations of the order of 15 to 50 Hz to condense the porcelain materials and remove air and liquid therefrom prior to firing.

Abstract: A microscope for use in applications wherein the object to be observed may move in a path along the optical axis of the microscope which includes an objective lens, collimating lens for producing a parallel beam, and an imaging lens for focusing the parallel beam to form an image, the objective and collimating lenses being movable with the object being observed.

Abstract: A dissolved oxygen analyzer which includes a sensor having a lead electrode and lead wire extending therefrom and a silver electrode and silver wire extending therefrom. The electrodes are immersed in an electrolyte and both metals are substantially pure. The silver electrode is positioned in adjoining relationship to an oxygen permeable membrane immersed in a sample water stream being tested. The sensor further includes a pressure equalizing diaphragm in communication with the sample water to maintain uniformity of pressure in the sensor with that of the water and a constant head tank maintains uniform water pressure and a thermistor monitors the water temperature and modifies the output of an amplifier connected to said wires to compensate for temperature changes.

Abstract: A detector for reducing and oxidizing agents carried by fluids which detector includes an elongated exposed porous member having an opening extending therethrough, an electrolyte gel containing a metal salt filling said opening, a first metal electrode extending through said gel and a metal electrode on the outer side of said porous member, the porous member and electrode upon being placed in the path of the fluid will cause a current to be developed between the electrodes which is proportional to the amount of chemical in said fluid. The detector is especially useful for the detection of hydrazine in boiler feed water.

Abstract: A strain gage load cell having a primary load carrying member subjected to deformation under stress, a secondary load carrying member affixed to the primary load carrying member in bridging relationship and having a portion of reduced section substantially shorter than the primary load carrying member and a strain gage affixed to said portion of reduced section of said secondary load carrying member.

Abstract: The method of affixing a bolt in a hole in foundations formed of materials such as concrete, stone or rock, wood and the like which includes inserting a bolt in said hole, filling the space surrounding said bolt with a plurality of balls, pouring a liquid curable resin into the hole to fill the interstices between the balls and then curing the resin and the resulting structure.

Abstract: An optical smoke detector having a light source and a light detector with the light detector shielded from direct light from the source. The light source is energized by a pulse generator and the outputs of the pulse generator and the light detector are fed through electric circuitry to produce one type of signal when the device operates normally and detects smoke and another type of signal should the detector fail to function in a normal manner.

Abstract: A rack for dispensing articles which includes a plurality of shelves divided into discrete channels and positioned one above the other. The shelves are each pivoted to supporting means at a point between the ends thereof and means are provided to position the shelves at one inclination for loading and at another inclination for dispensing the loaded articles.

Abstract: A knee abductor and restrainer for use on chairs such as wheel chairs and the like to aid in maintaining a patient in an upright position which includes a seat portion having straps for holding it on to the seat of a chair, a pair of restraining and supporting straps secured to the seat portion and extending upwardly between the patient's legs and partially around the body, the restraining straps having fastening straps extending from the ends thereof for attachment about the back of the chair in order to retain the patient in position and at the same time afford adaquate leg movement.

Abstract: A method and apparatus for fluidizing materials wherein a gas such as air is fed into conduits through which the materials to be fluidized flow under pressure, said air being fed into the material conducting conduits at angles in the range of 60.degree. to 120.degree. relative to the direction of material flow, the material conducting conduits being coupled with a third conduit for mixing the fluidized materials. The material conducting conduits are flushed by insertion in a container having means for effecting the flow of a solvent and a gas such as air therethrough.

Abstract: A method and an apparatus for measuring the carbon dioxide content in beer, in which a beer sample is separated in a vessel and there being created above the beer in the vessel a carbon dioxide atmosphere the pressure of which is measured. A temperature-responsive element is introduced in the beer of which the electric properties similarly vary with the temperature as the Henry constant. An electric signal proportional to the measured pressure is applied to an electric circuit arrangement of which the transfer function depends on the electric properties of the temperature-responsive element. The output signal of the electric circuit arrangement functions as measure for the carbon dioxide content.

Abstract: An analog to digital convertor for converting mechanical motion to an electric digital signal which includes a code plate carrying gray codes for measuring displacement, codes for parity bits and parity check control bits and gray code reading means and decoder therefore wherein the parity bits detect the occurrence of a readout error and producing a warning signal while the parity check control bits detect an incorrect parity check caused by errors in the sensing operation such as dirt, dust, or damaged sensing elements, and produces a second warning signal, a memory for temporarily storing the output of the decoder and circuitry inter-connected with the memory and decoder to produce a third warning signal when the difference between the outputs of the memory and the decoder is greater than a predetermined value, circuitry for producing a first error signal when only the second warning signal is present and a second error signal when at least the first and third warning signals are present.

Abstract: A pressure-sensitive adhesive tape comprising a substrate formed of high-density, flexible, open-cell polyurethane foam impregnated with a chlorine-containing elastomer and coated with a pressure-sensitive adhesive.

Abstract: Filtering means for biophysical recording apparatus for removing interference from a signal source which includes a band rejection or notch filter and means for inserting the filter into the signal circuit when the signals have a certain characteristic and for removing the filter when the signals have another characteristic.

Abstract: A bearing structure for supporting at least one end of the cylindrical housing of a cylindrical lift pump for handling large volumes of fluid, particularly sewage, and, in particular, to bearings for carrying the load of the pump which bearings include at least two supports for engaging a wear ring or track carried by the cylinder with each support disposed on opposite sides of a vertical axis bisecting the cylindrical housing and having at least two coplanar rollers carried by a first base member which is in turn pivotally carried by a second fixedly positioned base member for tri-axial motion relative thereto.