...somewhat less rate than quartz, and crushed trap for about the same as granite, but no satisfactorv estimate has been obtained for either of these. The...of the available sands, would so greatly increase itscost that the product would not be much cheaper than the crushed quartz, and would be much inferior...

...for about the same as granite, but no satisfactory estimate has been obtained for either of these, could undoubtedly be furnished of the size of grain...it in sharpness and uniform hardness of particles. The molds furnished are usually of iron or brass, the price of the former being $2, and of the latter...

...required at little, if any, extra expense. A bed of uniform, clean sand of the proper size of grain haa not been found, and it is believed that to wash, dry,...it in sharpness and uniform hardness of particles. MOT/DS The molds furnished are usually of iron or brass, the price of the former being $2, and of the...

...to 37 per cent, of crushed quartz No. 3 passes a No. 30 sieve, and none of it passes h No. 50 sieve. A bed of uniform, clean sand of the proper size of...any of the available sands would so greatly increase the cost, that the product would not be much cheaper than the crushed quartz, and would be much inferior...

...these. The use of crushed quartz is recommended by your committee, the degree of fineness to be euch that it will all pass a no. 20 sieve and be caught...it in sharpness and uniform hardness of particles. MOT.DS The molds furnished are usually of iron or brass, the price of the former being $2, and of the...