Abstract: An agricultural wheel assembly constructed of a plastic wheel half and a metal half releasably secured together for use with agricultural row crop planters and grain drills. The plastic wheel half has a smooth flat or shallow cup for eliminating the problems related to "rooster tailing". The metal wheel half having a deep cut configuration for clearance when mounted on the agricultural equipment and exhibiting structural strength above and beyond that of the plastic wheel half. The wheel halves are releasably but tightly locked together. An improved clincher base tire for the plastic-metal wheel assembly having an offset tire lip for depth/gauge control and a base having a dependent nose adapted to be snugly received at the juncture of the wheel halves for substantially eliminating soil infiltration between the tire and the wheel assembly when mounted on the plastic half.

Abstract: A mounting bracket or socket for use with a flexible highway sign capable of being rolled up for storage and portability. The mounting bracket being molded from a non-rigid, elastic material that is reasonably transparent and having a socket for accommodating a frame member for the highway sign in a non-rotatable relationship. The plastic bracket including a securing platform integrally molded therewith for securing the bracket to the highway sign. A reinforcing member of substantially the same length as the mounting bracket for clamping the highway sign between the bracket and the reinforcing member. The sign engaging surfaces of the bracket and the reinforcing member each include tear resistant elements for clamping the sign to thereby transfer the sign tearing load from the fastener securing the bracket and reinforcing member to the highway sign.

Abstract: An improved perfluorinated, ion-exchange polymer, either in the form of a membrane or a thin film useful as the electrolyte in chemical sensors. The polymer is treated with an acid, such as boric acid or a mixture of boric acid and phosphoric acid, to maintain the ionic conductivity of the polymer to approximately 180 degrees Centigrade. The improved polymer electrolyte is utilized to sense moisture by a two electrode structure with the electrodes arranged in interdigital fashion and the electrolyte film cast over the electrodes. The electrolyte is included in a 3 electrode sensor for sensing various types of gases.

Abstract: A method and apparatus for warning a motor vehicle operator of an approaching emergency motor vehicle having a sounding siren. The method comprehends selecting two frequencies A'-B' that fall within the siren frequency range and providing a microphone for detecting the sound signals including the siren signals and filtering out the electrical siren signals by a band pass filter. The selected A' and B' frequency signals are individually detected to provide output indications thereof representative of an A'-B' frequency transition. The output indications are processed for determining the preselected number of frequency transitions and producing a warning signal representative of the approaching emergency vehicle. The warning signal is utilized to give the motor vehicle operator an audible alarm and/or a visible alarm and deenergizing the motor vehicle's sound system.

Abstract: A method and apparatus for finding an edge of a workpiece prior to machining the workpiece by a machine tool. The apparatus includes a collar that is mountable to be secured to the head of a machine tool. The collar has four flat surfaces spaced in quadrature on the outside surface thereof and an adjustable reference member extending outwardly therefrom for initial calibration. The apparatus also includes an edge finding assembly that is releasably clamped to the collar at the reference members for edge finding and carrying a dependent contact probe coupled to a dial indicator for indicating the movements of the contact probe, the collar and edge finding assembly being adapted to be fixed in a preselected vertical plane when mounted to the collar secured to the head of a machine tool for finding the true zero X & Y reference edges of a workpiece to be machined.

Abstract: A two-piece, detachable traffic channelization element having an improved base element. The base element has a low profile, dome-like configuration with a ballast storage chamber. The storage chamber may be completely filled with a sand ballast and sealed in its storage condition by a cover secured to the chamber. The base element is molded of a resilient crush resistant plastic so that when it is fully ballasted, need not be ballasted again, and which low profile base can be traveled over by motor vehicles without engaging the base. The detached base, filled with ballast, can be continuously traveled on by motor vehicles, including loaded trucks, without damaging the base element and rendering it useless and the need to be replaced.

Abstract: A device and method for protecting D.C. powered electronic equipment to be isolated from a D.C. marine power source for minimizing the interference of extraneous signals on the power signals along with a back-up D.C. power source for powering the electronic equipment in the event of the loss of operative power signals from the D.C. source. The device may include a remote indicator for signalling the marine vessel operator that the electronic equipment is being powered from the back-up power source and not the main power source.

Abstract: An electrochemical gas sensor having a solid ionic conductive electrolyte therein and adapted to sense trace levels of reactive gases in the parts per million range. The electrochemical sensing cell has a pair of catalytic electrodes attached to the opposite sides of the solid electrolyte. The sensing cell is supported and contained to permit the distribution of reactant gases over the electrode surfaces for reacting thereat and thereby providing an external electrical current flow representative of the quantity of the reactant gas undergoing sensing.

Abstract: A resilient dispenser (30) for dispensing two flowable materials in touching association is provided. When the dispenser is squeezed the materials are dispensed through juxtaposed apertures such that the materials share a common boundary after dispensement. A removable spout (60) allows easy filling of the dispenser. Various embodiments (130,230,330, 430,530) are provided, some of which impart interesting patterns to the dispensed materials. The invention includes extension to more than two materials or restriction to one material. A method of use is provided.

Abstract: An electrochemical gas sensor having a high surface area gas diffusing electrode defined for diffusing gases to be sensed to reach the catalyst surfaces of the electrode to provide the cathodic reduction of oxygen in a gas mixture undergoing sensing thereat. The sensor is adapted to sense trace levels of reactive gases in parts per billion. The sensor provides for ready purging of reactive gases from the electrolyte solution for the cell. The cell is essentially insensitive to the rate of flow of gas delivered to the cathode electrode and the minor mechanical stirring of the electrolyte solutions leading to output signals of improved signal-to-noise ratios more accurately signalling the concentrations of reactive gases, such as oxygen in gas mixtures.

Abstract: A portable hammock kit having aminimum of modular components for assembling and disassembling the modular components for storage or transportation to another location and store all components in a convenient carrying bag. The hammock stand can be assembled with three modular components without fasteners or tools. The hammock stand accommodates a hammock bed suspended from a pair of modular leg assemblies that allow for vertical adjustment of the elevation of both the head and foot ends of the hammock bed. A canopy can be readily mounted and dismounted over the assembled hammock stand.

Abstract: A two-piece, detachable traffic channelization element having an improved base element. The base element has a low profile, dome-like configuration with a ballast storage chamber. The storage chamber may be completely filled with a sand ballast and sealed in its storage condition by a cover secured to the chamber. The base element is molded of a resilient crush resistant plastic so that when it is fully ballasted, need not be ballasted again, and which low profile base can be traveled over by motor vehicles without engaging the base. The detached base, filled with ballast, can be continuously traveled on by motor vehicles, including loaded trucks, without damaging the base element and rendering it useless and the need to be replaced.

Abstract: The disclosed filter element is a screen filter having a vane arranged on the outside surface of a screening element for improving the filtration of solid contaminants from a liquid undergoing filtration. A single cartridge screening element may be quickly cleansed with in a minimum time interval with raw water and without requiring the removal of the filtering element.

Abstract: A flexible highway safety sign capable of being rolled up for storage and portability and mounting a high-way flag. The safety sign is useful with flexible frame members that allow the mounted sign to bend in response to winds and wind gusts without tipping over and taking a set. The frame members include a clamping assembly for mounting a plurality of flag arms with the highway sign. The clamping assembly permits a pair of flag arms to be pivotally secured thereto between a flat displaying position and a storage position. The storage position allows the flag arms to assume a side-by-side relationship with the folded frame members to the sign to permit the flexible sign to be wreapped around the members for storage and/or transport.

Abstract: A method and apparatus for advance warning signaling to a motorist of an ice condition on a driving surface. The method steps include mounting a plurality of traffic signalling devices along a driving surface for sensing the prevailing temperatures and thereby continuously signal a motor vehicle operator of the changes in temperature as he approaches a driving surface subject to freezing to permit him to take any necessary precautionary corrective action in driving the motor vehicle. The signalling devices utilize thermostat elements for sensing a narrow temperature range adjacent the freezing temperature and provide visible signals, preferably two colors for signalling a warm or nonhazardous temperature, a cold temperature signalling a frozen driving surface or a combination or mixture of the colored signals to permit the motor vehicle operator to be warned, in advance, as he approaches a driving surface that is becoming colder, leading to a stretch of a driving surface that may be frozen.