Patents of Interest to Builders.

Progress, Volume XIV, Issue 12, 1 August 1919, Page 579

Patents of Interest to Builders.

Reinforced Concrete Structure patent, No. 41259, has been taken out by James Parker, and Omerod Mitchell, both of England. It consists of interposing within the thickness of the concrete walls of such structures a partition or thick -

ness of flexible waterproof material— such, for instance, as

bitumastic sheetingin close proximity with which, but held in spaced relation thereto, the reinforcing members are suitably disposed and tied together, and to which the

concrete in a plastic condition is applied by hand by passing the samp through the spaces in or between the reinforcing members and; then building up and finishing the facing-surfaces. /

. Ore Concentrator— patent, No. 41448, has been taken out by Ferdinand G. Gasclie, of Chicago. Consists in directing a stream of the particles in a single direction across a floor at a velocity which initially is substantially uniform irrespective of the varying size and ■weight 1 of the particles, and against an atmosphere, which absorbs the enepgy of motion of the individual particles, thereby causing the precipitation of the particles upon said floor at points near and far from the point of initial projection according to the varying size and weight of the particles. The apparatus comprises an ore-pulverising machine, in combination with an ore-container wherein the pulverised ore may be held ufider air-pressure a valvcd outlet for said container for the discharge of the -ore with a portion of compressed air, a gun or nozzle which receives the-pul-verised ore and air, and a concentrating-floor over which said nozzle is directed. Other features arc : contained in invention. •

Boad Surfacing A patent, No. 41226, has been taken out by Leonard G. P. Spencer, of Auckland, which, consists of

the combination of reinforced concrete and tar macadam roadways, and two concrete wheclways tied together at intervals with rcinforced-concrotc ties.

Wood, etc., Protecting and Fire-proofing — patent, No. 41149, has been taken out by Artcnox Co., of Delaware, U.S.A. It comprises treating materials with an ammoniacal solution containing a zinc compound, but substantially free of other non-valatilc constituents, said solution having an alkaline reaction towards phcnolphathalein, and its content of combined zinc being at least about 5 per cent. Other features are contained in invention.