A pair of V block centers, for being used with a conventional V block, in order to support and center any rectangular stock upon the V block, while being machined; the pair of V block centers each consisting of an elongated rectangular bar, which has one of its longitudinal corners cut out to form an inside square corner, in which a rectangular work piece is positioned, an opposite longitudinal corner of the bar being cut off at a forty-five degree angle, in order to rest against the angular fac...

A building block comprising a pair of plane walls which constitute a front and rear wall thereof, the front and rear walls being formed without connecting bridges or webs therebetween and being maintained in spaced relationship by an insulating material. In one embodiment the block is formed from two block parts, the first block part including the front wall of the block and the second block part including the rear wall of the block, the arrangement of the block parts being such that the parts a...

A connector block having at least one internally bussed section comprises an electrically insulating housing having top and bottom faces and an electrically conductive buss contact. The housing has exposed on one face a plurality of apertures adapted to receive leads and exposed on an opposite face a plurality of first openings in line and communicating with the apertures respectively and a second opening bridging sides of and communicating with the plurality of first openings. The electrically ...

A tank block has an inner surface facing a glass melt, an outer surface facing away from the melt, an upper or head portion and a lower or base portion. An inner layer is formed of a material which is highly resistant to corrosion by the glass melt. A central layer is formed of a material which is less resistant to corrosion and is joined to the inner layer. An outer insulating layer is firmly joined to the central layer. The tank block is designed so that the inner layer is thickest at those ar...

A building wall utilizes a pair of cementuous blocks having a thermally insulating space therein-between The blocks are fastened together by tie rods whose ends are secured in the spaced apart blocks. The portion of the rods extending between opposed lateral surfaces of the blocks have a portion of the length thereof formed into a "V" shape for concentrating water condensation trapped in the space between the blocks permitting the condensation to fall freely downwardly in the space. The blocks m...

A block polymer of an alkyl vinyl aromatic compound, conjugated diolefins and an alkyl-vinylpyridine with the central poly(diolefin) segment being branched by copolymerization with divinyl benzene to give a composition having improved 100 percent modulus, usually from 400 to 1400 pounds per square inch.

A wooden vent block for use in construction to provide attic ventilation has patches of screen pressed into vent holes in the wooden member, in an interference fit. The elastically deformable screens are of an undeflected size slightly larger than the vent holes, so that they deform when pushed in and become springingly locked in place. At the opposite side of each hole is an air conduit tube press fit into that side of the hole, with the vent block angled in accordance with the roof line so tha...

Block copolymer of the structure A-B wherein: A is a polylactone block of recurring units: ##STR1## wherein PM is a linear polymethylene chain having from 2 to 13 carbon atoms, B is a polyoxymethylene block of recurring units --CH.sub.2 O--. The block copolymer contains at least 2 wt.% of block B and at least 0.1 wt.% of block A. The block copolymer can be used as modified polyacetal when rich in block B, or as special additive for plastics materials when rich in block A.

A mixture of isomeric methyl ethenyl benzenes having a particular distribution of isomers is useful for preparing polymers with advantageous properties. The isomeric mixture may be polymerized with other monomers to produce copolymers.

A chain block having an attaching member connected to the load-free end link of a load chain entrained around a load sprocket wheel rotatably supported by and between a pair of lateral plates. The attaching member is pivotally mounted at one end portion thereof between the pair of lateral plates by a pin which extends through the attaching member and the pair of lateral plates. The other end portion of the attaching member at which the latter is connected to the load-free end link of the load ch...