Abstract: The portable apparatus for cementing edges of lengths of sheet material in adherent relationship over a roof comprises a horizontally oriented base structure having contact means at its lower surface for applying pressure upon the sheet material. The base structure has one substantially straight lateral side which is located adjacent and parallel to an imaginary vertical plane. The apparatus includes a brush member for applying cementing fluid underneath an edge of sheet material. The bristles of the brush member are at an angle of between about 90.degree. and 140.degree. with respect to the main body of the ferrule in which the heel end of the bristles are retained. A ferrule holder holds the main body of the ferrule of the brush member in vertical orientation next to the aforenoted imaginary vertical plane at a location forwardly beyond the leading edge of the base structure, with the bristles of the brush member extending away from the imaginary vertical plane.

Abstract: The new composite flexible sheet material comprises a base sheet structure made up of a thermoplastic resin layer which is flowable or fusible at predetermined sealing conditions, plus a polyester backing layer non-flowable or non-fusible at said conditions. The thermoplastic layer is thicker than the backing layer. Adhered to the thermoplastic layer is a layer of polyester fibrous material not flowable or fusible at said sealing conditions. The fibrous material layer is capable of being substantially submerged into the thermoplastic layer upon the application of sealing conditions. A preferred invertible envelope-type packet is formed by using a composite sheet having a thermoplastic fusible layer and a non-fusible backing layer, and involves placing the thermoplastic layer inwardly and the backing layer on the exterior of the envelope. Opposing walls of the envelope are united along portions thereof adjacent the envelope cavity.

Abstract: The intake system is adapted to supply a substantially intimately blended combustible mixture of fuel and air to a combustion machine. A conduit is provided for conducting a flowing stream of fuel and air to a combustion machine. Mixing means for blending the stream comprises a peripheral flow focusing structure for redirecting the flow of at least substantially all peripheral portions of the stream from vectors of generally linear flow substantially adjacent the interior surface of the conduit to vectors of inward flow interjacently substantially converging toward a central zone removed from the interior surfaces of the conduit and removed from the focusing structure.

Abstract: Apparatus for improving the skills of mathematical computation and alphabet usage, comprising a computation selector in combination with an answer verifier. The computation selector comprises a problem board member and a selector member mounted for relative rotation with respect to each other. Computational problems are carried on the problem board member with the correct answer to each problem represented by a code marking or letter code on the problem board. Selection of a specific problem is governed by chance, being the result of rotation of the selector member in relation to the problem board. The answer verifier comprises an answer board member and a visibly distinct identifier member mounted for indexing movement with respect to each other. Letter codes from the problem board are arranged on the answer board member in uniform association with the numerical value of the correct answer represented by them.

Abstract: This apparatus for supporting a human body for improved blood circulation comprises a frame, a pair of endless flexible belt assemblies having transverse roller members, means for mounting the belt assemblies on the frame to form laterally juxtaposed body support spans each consisting essentially of an upper stretch of the roller members of a belt assembly, means for moving the belts to cause the roller members to move along the body support span of each belt assembly, and track means for supporting at least some of the roller members of the laterally juxtaposed body support spans in an angular position toward a V-shaped relationship for a partially cradling body support effect.

Abstract: The invention refers to a foundation or support arrangement to be secured to the lowermost surface of a construction or to one of the lowermost surfaces of a number of legs for supporting a construction intended for marine or submarine installation. According to the invention the foundation or support arrangement comprises a plurality of downwardly directed support elements defining one or more cells or spaces therebetween which are open at the bottom. Said support elements are arranged to penetrate into any deposits present on the bottom of a sea or lake when the construction is positioned on the bottom, said deposits being received in the cells or spaces to a degree dependent on the contour of the bottom.

Abstract: A wooden cooking tool is taught wherein a shank of substantial strength connects a contoured spoon-bowl at one end and a contoured fanned spatula at the other. The spoon-bowl blends symmetrically into the shank portion and is contoured so that its outermost end projects ventrally relative to the axis of the tool. The spoon-bowl serves the function of not only a spoon-bowl per se, but also that of a handle member when the tool is turned upside down for use as a spatula. The size, shape and thickness of the spoon-bowl permit one to grip it with the fingers of one's hand inside the convex portion and the palm on the concave outer portion. The spatula is a contoured fanned structure which terminates in an angularly disposed substantially straight edge. The slope or angularity of this edge is such that the lateral extremity of it lying most outwardly from the shank is at the right of the axis of the tool as the tool is gripped at the spoon-bowl for spatula use and the spatula pointed upwardly.

Abstract: An animal facility, having a movable assembly and means for moving it along an alleyway, is equipped with means for emergency reversal of the direction of travel of the assembly at any point in its path of movement. The emergency reversal means comprises a stress balance means which normally remains in a balanced condition, but shifts to an unbalanced condition when the normal movement of the assembly is obstructed. The unbalanced condition is sensed; and actuating means responsive to the sensing is relied upon to effect reversal of travel.

Abstract: The easily serviced aeration apparatus of the invention includes a central base structure comprising a source of air under pressure, a plurality of lateral passages extending radially outward from the source, a diffuser hanger at the outward end of each lateral passage, and a dependant assembly suspended in hanging relationship downwardly from each hanger. Each dependant assembly comprises a downwardly depending flexible air conduit, an aeration diffuser at the lower end of the conduit, and means for maintaining the diffuser at a submerged depth as air is fed thereto. Additionally provided is a porous plastic aeration diffuser.

Abstract: Photographic printers of versatile character are taught. Disclosed is a printer having a lens carrier assembly which includes at least one subassembly of shiftable lens boards adapted to be moved in and out of an operative position for photographic printing. The subassembly can be moved as a unit out of engagable relationship with power means for shifting the lens boards. The power means for shifting the lens boards is not moved with the subassembly. An alternate subassembly may then be moved into position for operation by the power means. Disclosed also is a composite lens carrier assembly which, as a complete unit, can be entirely removed from a printing apparatus to permit an alternate assembly to be inserted. Additionally disclosed is a new location for a shutter mechanism, at the window into a chamber for the light-sensitive print material. Further, there is disclosed a new negative holder assembly of removable and replaceable elements. This negative holder assembly is capable of a 90.degree.