. Electric railway journal . en poured, or otherwise applied, be-tween the slabs. When this cement sets, within, say, 10minutes after application, the homogeneous mass therebyformed becomes an integral part of the slabs. This flooring may be sawed, planed or drilled and nailsmay be driven through it without danger of cracking orother injury. The material naturally clings to the floor orOther surfaces upon which it is laid, and does not curl at the edges or corners. Hence it is not essential to securethe material to the floor, except under certain conditions,such as when the slabs are small and
. Electric railway journal . en poured, or otherwise applied, be-tween the slabs. When this cement sets, within, say, 10minutes after application, the homogeneous mass therebyformed becomes an integral part of the slabs. This flooring may be sawed, planed or drilled and nailsmay be driven through it without danger of cracking orother injury. The material naturally clings to the floor orOther surfaces upon which it is laid, and does not curl at the edges or corners. Hence it is not essential to securethe material to the floor, except under certain conditions,such as when the slabs are small and it is necessary tokeep them from moving along the floor surface. IMPROVED HIGH-VACUUM AIR PUMP The C. H. Wheeler Manufacturing Company. Philadel-phia, Pa., has recently developed a new type of rotaryhigh-vacuum air pump for condenser purposes which occu-pies much less space than other types of pumps commonlyused. It also has the advantage of being adapted for directconnection to one of the other auxiliaries, as shown in the. End Elevation and Cross-Section of Rotary Air Pump accompanying engraving. This cut shows a Rotrex airpump and a centrifugal circulating pump direct connectedto opposite ends of the shaft of a high-speed vertical engine. The construction of the Rotrex air pump is very consists of a light cylindrical casing and a single rotoreccentrically mounted on a heavy steel shaft carried inring-oiled outboard bearings which are independent of the
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
