Show I 1 HO HOW W WOULD YOU COUNT THE IN ONE CUBIC INCH OF CEMENT in a eingle single c cubie able inch of portland cc meat mont such as a the manufacturer manufacturers alp ship out by the tits trainload there are irately particles now how would you go about telling whether there were that danyl laboratory experts hare devised v way of doing it so far ae as meeting the fineness re quire ments of tho the standard fica lions ia is ton cernea the spec fixations ficat ions 4 established by the united stat gov rov eminent aad the american society for testing materials Mafer lala certain exceedingly fin sieves aro close enough counters one of these oyei 1 ve i bas has hair like wires to tie cis linear boeh which means opening openings to the square inch it is io more closely woven than a fine ity of ilk silk drees dress gooda goods and 78 79 per cent tent at least of the fici f elied cement par hales mast must be mall small enough to fiat ift through it the te malting making ui luch such a etere is U an art la in itself only the best quality of ex fine bronie bronze wire drawn through diamond diee dies i is isabl cue alle he of this wire ie is needed to wre a single square foot of lore glove la in th the fin ashod elca both the wire wires and the tiny bolo between mat must be uniform ia in ize size the sieve toot gives you ae as much as you really bare have to know about the fine IOU ie of cement to meet tho the stai dari specifications although most of the cc anant particles am are much mailer smaller than the holes IB in the sieve dut but for certain experimental work in their search for a better product UK the manu rs wanted to know more they wanted to know the exact liza size of the particles parti clea that went through the sieve and ia in that way approximately how many there were to the cubic inch so 80 they called an air analyzer into service the chief difficulty about measuring the particle particles of cement coment had been that tiey stuck together it was not certain whether one or everal several were being measured ahe he alt air analyzer takes ears car of this it consists of a series of bran brass stacks tacks and 1102 nozzles and by blowing jam sarn pie pies of cement up the stacks the particle particles are thoroughly separated their lize size can then be determined by micro cople measurement it has been found in this way that it would take six ix mil rail lion average cament particles laid closely in rows to cover a square inch of glass that ia Is the fineness of finished ce cc ment which is he product of the grind ing of cement clinker the raw materials from which the clinker is made by kun kiln burning must be even finer flur eighty five per cent of them commonly must shake through the wire sieve glove if the correct results are to be obtained in buru burning lug where coal ie is used it alao also must be pulverized to approximately this fineness to get the right fuel effi elency clency s eight separate rp arate heavy crashing aad and grinding operations are required to ae coblish con lish the pulverizing necessary u in ft a typical cement mill milt |