TransactionsE. & F. Spon, 1886 Rules and List of members included in some volumes. |
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Seite 53 - ... or student poll. What we have before us is the lead editorial in the first issue of the subsidized house organ of...
Seite 102 - ... days to show an increase of at least 50 per cent over the strength of those at three days, but to carry a minimum of 350 pounds per square inch.
Seite 102 - Fineness. — To be such that the cement will pass through a sieve having 625 holes (25*) to the square inch, and leave only 10 per cent residue when sifted through a sieve having 2500 holes (50') to the square inch. Expansion or Contraction. — A pat made and submitted to moist heat and warm water at a temperature of about 100 degree?
Seite 94 - The whole of the cement shall be Portland cement of the very best quality, ground extremely fine, weighing not less than 112 Ibs. to the striked bushel, and capable of maintaining a breaking weight of 350 Ibs. per square inch seven days after being made in a mould, and immersed in water during the interval of seven days.
Seite 96 - FINENESS. The question of fineness is wholly a matter of economy. Cement, until ground, is a mass of partially vitrified clinker, which is not affected by water, and which has no setting power. It is only after it is ground that the addition of water induces crystallization. Consequently the coarse particles in a cement have no setting power whatever, and may for practical purposes be considered only as so much sand and essentially an adulterant. There is another reason why it should...
Seite 102 - Portland, which have been gauged, treated, and tested in the prescribed manner, to carry an average tensile strain, without fracture, of at least 176 Ibs.
Seite 102 - FINENESS to be such that the cement will all pass through a sieve having 625 holes (25") to the square inch, and leave only 10 per cent, residue when sifted through a sieve having 2,500 holes (502) to the square inch.
Seite 7 - Thermo-dynamics, which deals with the equivalents of heat and work, and have very little bearing upon the practical question of efficiency, which requires us to have regard also to the second law. According to that law the fraction of the total energy which can be converted into work depends upon the relative temperatures of the boiler and condenser...
Seite 102 - Ib. per square inch at the expiration of three days from gauging, and those tested at the expiration of seven days from gauging shall show an increase of at least 50 per cent. over the strength of those at three days ; but the briquettes broken at the seven days...
Seite 131 - ... down from father to son, was carefully tended, and never allowed to rust, being its owner's most precious possession. While in Europe the fashion continually changed, the weapons of one decade were superseded in the next, and consequently were left to rust in lumber-rooms and armouries. Mr. W. GOWLAND said he was sure that all present would agree with him that the paper which they had the pleasure of hearing was a most excellent piece of work, worthy of the warmest and heartiest praise, and especially...