. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . ects shouldbe satisfied with obtaining the desired strength which theyspecify, for there is not much value or use in experimentswhich travel beyond the point originally , this desire for unreasonable results has led to theassertion of some makers that their cements have attainedcertain imaginary breakings which, instead of having analluring influence on the minds of consumers, have a ten-dency to create caution in adopting cements of such super-excellent quality. 56 A PRAC
. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . ects shouldbe satisfied with obtaining the desired strength which theyspecify, for there is not much value or use in experimentswhich travel beyond the point originally , this desire for unreasonable results has led to theassertion of some makers that their cements have attainedcertain imaginary breakings which, instead of having analluring influence on the minds of consumers, have a ten-dency to create caution in adopting cements of such super-excellent quality. 56 A PRACTICAL TREATISE ON CONCRETE. Mr. Deacons test may be termed an easily extemporizedone, and will no doubt prove acceptable to many small con-sumers who have neither time nor opportunity for adoptingthe more complicated and expensive machines. In large works it is, however, more advisable to use thehigher-class testing apparatus, so that an accurate reliablerecord shall exist of the quality of cement used and itsbehaviour when submitted to examination by a good andproperly constructed machine. Fig. Baileys Testing Machines. Fig. 3 represents a Baileys single lever machine, thetesting weight of which is applied by a stream of water MATRICES. 57 passing from the fixed cistern. When fracture arises, thevalue is indicated on the graduated glass or tin cylinder. The plan recommended for moulding the briquette usedin testing by this machine is simple. There is no pressureapplied, the mould being hinged, and when the cement hasbecome firm enough the mould is opened and removed,leaving the briquette on the pallet or board, from which it isin due course taken and placed in the water cistern. There is much advantage realized in obtaining briquettes Fig. 4.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1879
