Circular of the Bureau of Standards, Masalah 24U.S. Government Printing Office, 1944 |
Edisi yang lain - Lihat semua
Istilah dan frasa umum
adsorbed adsorption aldonic acids alloy Ambrose H American Standard ampere anions antimony aromatic austenite Bekkedahl blankets bone chars brary buffer Buna Bureau of Standards calcium calculated carbide carbon cells cellulose cellulose acetate cement cementite changes chloride clinker coefficients coils College columns concrete constant determination dissociation effects enzymes expansion fabrics fiber flax formation fraction fractional freezing galacturonic acid grain halogen halogen derivatives heat-transfer high-purity Homasote Hycar hydrocarbons hydrolysis included ionization iron iron-carbon alloy Keulegan Kronstadt Krynitsky labeling Library machine masonry materials McAdam measurements Mechanical properties ments metals and alloys method mixtures molality mortars National Bureau obtained offset papers oxidation pearlite percent Perforated cover plate pH values prismatic protein Public range rate of heating rubber samples Schiefer sodium solution Sookne specimens steel strengths strontium structure sulfonic acids surface Technologic Papers temperatures tensile tests thermal tion treatments for glass University volume walls wool
Bagian yang populer
Halaman 58 - These are voluntary recorded standards agreed upon by producers, distributors, and consumers, covering terminology, types, classifications, grades, sizes, and use characteristics of manufactured products as a basis for better understanding between buyers and seller.
Halaman 46 - Measurement of the refractive index and dispersion of optical glass for control of product Helen L.
Halaman 61 - Mineral Wool: Blankets, Blocks, Insulating Cement, and Pipe Insulation for Heated Industrial Equipment.
Halaman 22 - The treatment used with apparatus A caused fading which averaged 20 times as fast as fading outdoors, but the speed-up factor varied from roughly 5 times for one paint to roughly 40 times for another; (2) the treatment used in conjunction with apparatus B caused fading which averaged 5 times as fast as fading outdoors, but the speed-up factor varied from roughly 3 times for one paint to roughly 20 times for another; and (3) for almost every...
Halaman 66 - No. 4), pea gravel (No. 4 to %. inch), and %-inch gravel (% to % inch) , was used, with 2% bags of cement per cubic yard in concrete tamped in place and 3 bags per cubic yard when no compacting was done. Walls, wallettes, beams, and bond pull-out specimens were tested, as well as 6- by 12-inch control cylinders. Compressive, transverse, shearing, and bond strengths are reported, as well as resistance to heat transfer, water penetration by capillarity, and rain penetration.
Halaman 37 - SO2, in the proportions occurring in portland cement clinker, is heated and cooled under equilibrium conditions. Frequent observations of a prismatic dark interstitial phase in etched, polished sections of commercial clinker and in rapidly cooled laboratory clinkers led to the present study of the relation of this phase to the system K2O.23CaO.12SiO2-CaO-5CaO.3Al2O2 and to other systems involving K2O. The prismatic phase has not been found to exist under equilibrium conditions, but has been produced...
Halaman 23 - F. Although the initial structure had some influence on the grain size of the commercial steels, no definite correlation was found between the grain size and the interlamellar spacing of pearlite, or the form and distribution of carbides. The rate of heating had a marked influence on the grain sizes at 1475 and 1600 deg.
Halaman 24 - ... was investigated. Variations of the hardness of the surface layers extending to different depths below the surface of the specimens were determined by applying different loads on a Knoop indenter. Indentation hardness tests also were made with the Rockwell superficial hardness machine. The results obtained with the Knoop indenter showed significantly lower hardness numbers for the superficial layer of the steel after the lighter degrees of rolling, the magnitude of change apparently being influenced...
Halaman 22 - The full-mat enamels were found unsuited for architectural use where appearance is important, because of fading and of difficulty in cleaning. Mild fading, found on some of the non-acid-resistant colored enamels, was associated with a minute pitting of the enamel surface, probably caused by the presence of acidforming gases in the atmosphere. The enamels of high acid resistance did not show this effect. Weathering of the panels was found to be more pronounced at those locations where there is a relatively...
Halaman 2 - The rules of the Superintendent of Documents require that remittances be made in advance, either by coupons sold in sets of 20 for $1 and good until used, or by check or money order payable to the Superintendent of Documents. Currency, if used, is at sender's risk. Postage stamps, foreign money, and defaced or smooth coins are not acceptable. Postage is not required in the United States, to United States possessions, and to countries extending franking privileges. For mailing to other countries,...