Bulletin of the Bureau of Standards, Volumen2U.S. Government Printing Office, 1906 Contains results of investigations, researches, etc., pertaining to scientific, technical and manufacturing interests of the country. |
Contenido
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 | |
| 6 | |
| 7 | |
| 8 | |
| 28 | |
| 33 | |
| 42 | |
| 71 | |
| 87 | |
| 145 | |
| 146 | |
| 160 | |
| 9 | |
| 10 | |
| 11 | |
| 12 | |
| 13 | |
| 14 | |
| 15 | |
| 16 | |
| 17 | |
| 18 | |
| 19 | |
| 20 | |
| 21 | |
| 22 | |
| 23 | |
| 24 | |
| 25 | |
| 26 | |
| 27 | |
| 189 | |
| 225 | |
| 239 | |
| 261 | |
| 267 | |
| 275 | |
| 297 | |
| 318 | |
| 319 | |
| 331 | |
| 333 | |
| 359 | |
| 414 | |
| 415 | |
| 439 | |
| 457 | |
| 479 | |
| 485 | |
| 487 | |
Otras ediciones - Ver todas
Bulletin of the Bureau of Standards, Volumen2 United States. Bureau of Standards Vista completa - 1906 |
Términos y frases comunes
accuracy accurate alloys alternating currents angle annealing approximately axis bands bulb calculated cent circuit circular coefficient coil computed constant correction cross section current sheet curve cylinder determined diameter differential direct current effect electrical electrodynamometer electromotive force elliptic integrals equal radii equation error expression filament flicker formula frequency galvanometer given gives glass heating Hence ice point increase instrument insulation light lines magnetic marble mean distance mean horizontal intensity mean radius measurements mercury meter method mirror movable coil mutual inductance Nernst Nernst glower number of turns observed obtained photometer photometer screen polarization position potentiometer r₁ radiation reading reflection resistance revolutions per minute rheostat rotation scale self-inductance strip TABLE temperature thermometer tion torsion turns of wire voltage volts wattmeter watts wave length width winding Απα ΔΜ
Pasajes populares
Página 362 - Z^Aa t>- --= sm 7 /'<and E are the complete elliptic integrals of the first and second kind, respectively, to modulus k.
Página 480 - ... of the silicate radical is different in each mineral containing that element. The examination includes minerals of which the chemical constitution is in doubt, for example, talc and serpentine. The former is not supposed to contain hydroxyl groups, while in the latter such groups are inferred. The present...
Página 480 - The interpretation of the results is based upon the assumption that if the union of the oxygen and the hydrogen in the molecule is similar to that in water, then the absorption spectra of minerals containing these two elements thus united should show the absorption bands of water superposed upon the absorption spectrum of the other constituents. On the other hand, minerals containing oxygen and hydrogen as water of constitution should not show the water bands, except hydroxyl groups, which should...
Página 166 - ... should be a minimum. A very important example of the principle that steady currents distribute themselves so as to make the rate of heat production as small as possible, is that of the flow of a steady current through a uniform wire ; in this case the rate of heat production is a minimum when the current is uniformly distributed over the cross section of the wire.
Página 34 - CONCLUSIONS. The results of this investigation may be summarized as follows: (1...
Página 465 - ... alum. Since the per cent of water present varies continuously with the vapor pressure it is generally concluded that the water of the zeolites is not analogous to the water of crystallization of most hydrated salts, but resembles more nearly the intermixture which occurs in solid solutions. In fig. 6 two curves of heulandite are given. The sections were about the same thickness, and the great difference in transparency is due to the fact that the crystals were of different homogeneity and transparency....
Página 4 - If any part of the retina is excited with intermittent light recurring periodically and regularly in the same way, and if the period is sufficiently short, a continuous impression will result, which is the same as that which would result if the total light received during each period were uniformly distributed throughout the whole period.
Página 127 - E are the complete elliptic integrals of the first and second kinds respectively and r is a general radius within or around the circular pressure region which is of radius R.
Página 34 - ... a rotating sectored disk, is verified for white light for all total angular openings between 288° and 10°, to within a possible error of 0.3 per cent, which probably expresses the limit of accuracy of the experiments. (2) The observed deviations from the law for red, green, and blue light are of the same order of magnitude as those for white light, and hence Talbot's law is verified for red, green, and blue light, though not to such a high accuracy as for white light. Moreover, a difference...
Página 467 - Group II. — Minerals Containing Water of Constitution. The first part of this group contains minerals in which the oxygen and hydrogen are present in the form of the univalent hydroxyl radical OH, and which are known as hydroxides. The hydroxides when heated also yield water, but it is a characteristic that they must be strongly heated before they are decomposed. From previous work, already mentioned, we would expect an absorption band at 3 ij, for hydroxides.