Handbook for architects and builders . ,{ibove boiling water, in a loosely closedvessel for five hours. 23. These pats, to satisfactorily pass therequirements, shall remain firm and hard,and show no signs of distortion, checking,cracking, or disintegrating. Sulphuric Acid and Mag-nesia. 24. The cement shall not contain morethan per cent, of anhydrous sulphuricacid (SO.,), nor more than 4 per cent, ofmagnesia (MgO). THE CONTINUOUS CONVEYING OF MATERIALS. BY STAUNTON B. PECK. The manufacture of conveying machinery,and its adaptation to the various industries,dates from the year 1880, when a
Handbook for architects and builders . ,{ibove boiling water, in a loosely closedvessel for five hours. 23. These pats, to satisfactorily pass therequirements, shall remain firm and hard,and show no signs of distortion, checking,cracking, or disintegrating. Sulphuric Acid and Mag-nesia. 24. The cement shall not contain morethan per cent, of anhydrous sulphuricacid (SO.,), nor more than 4 per cent, ofmagnesia (MgO). THE CONTINUOUS CONVEYING OF MATERIALS. BY STAUNTON B. PECK. The manufacture of conveying machinery,and its adaptation to the various industries,dates from the year 1880, when a companywas incorporated for manufacturing and de-veloping such machinery. This company wasorganized by the manufacturers of the Ewartdetachable link belt in response to the de-mand for these links with attachments towhich pushers or buckets could be fastened,and to requests for advice about their utili-zation for all sorts of conveying purposes. Conveyors for the continuous handling ofmaterials may be divided into two generalclasses:. Roller Flight Conveyor (a) Those which push or pull tlieir load, the weight of the load not beingborne by the moving parts of theconveyor. (b) Those which actually carry the ma- terial handled. Conveyors of the first class push or pullthe material handled along in a trough. Asthe friction of the conveyor itself and thematerial conveyed on the trough consumepower and cause wear, the field of usefulnessof conveyors of this type is confined to rel-atively small conveyors with light service;or in the larger installations, to the handlingof materials with a low coefficient of frictionand which are not abrasive in their action,such as coal, grain, etc. One of the oldest forms, which, from itssimplicity and comparatively low first costis still one of the most extensively used,consists merely of an endless chain to whichare attaciied at intervals scrapers or improved forms of this conveyor, nowmost generally used, have sliding shoes orrollers
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