Journal of Research of the National Bureau of Standards, Volumes 32-33

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Department of Commerce, National Bureau of Standards, 1944 - Chemistry

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Page 233 - As a unit of resistance, the international Ohm. which is based upon the ohm equal to 109 units of resistance of the CGS system of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grammes in mass, of a constant cross-sectional area, and of a length of 106.3 centimetres.
Page 233 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 193 - To locate zero time (the time at which crystallization would have begun in the absence of undercooling), make a preliminary plot of the time-resistance observations covering the liquid cooling line and the equilibrium portion of the freezing curve. For this plot, as shown in Fig. 6, the time scale is taken so that 10 mm is equivalent to 1 min and the resistance scale (for a...
Page 32 - C, in an appropriate fraction of a given naphtha when there are known the relative amounts of the foregoing five classes of hydrocarbons, or alternatively for each class, the amount of one of the main components of that class.
Page 144 - Meyer, of the Bureau of Plant Industry of the United States Department of Agriculture...
Page 161 - ... benzene through isopropylbenzene. The separation of the aromatic hydrocarbons from the paraffins and naphthenes was quantitative within the limits of measurement, and their recovery was complete within the normal operating loss of material in processing. Experimental determinations were made of the quantity of aromatic hydrocarbon adsorbed per unit quantity of adsorbent, for a number of different binary solutions of aromatic hydrocarbons with paraffins or...
Page 401 - Preparing Refractory Oxides, Silicates, and Ceramic Materials for Analysis by Heating with Acids in Sealed Tubes at Elevated Temperatures," Journal of Research of the National Bureau of Standards, Vol 33, 1944.
Page 325 - Volumes2 of (d), cloth bound, consecutively paged and indexed. Volumes 15 to 22. 1910-1928: (/) TECHNOLOGIC PAPERS ' OF THE BUREAU OF STANDARDS, Tl to T370. Prior to T203 issued only as separates. (g) Volumes 2 of (/) cloth bound, beginning with T203, volume designated No.
Page 406 - Knowing this law of ColourBlind vision, we may predict any number of equations which will be true for eyes having this defect. "The mathematical expression of the difference between ColourBlind and ordinary vision is that colour to the former is a function of two independent variables, but to an ordinary eye, of three; and that the relation of the two kinds of vision is not arbitrary, but indicates the absence of a determinate sensation, depending perhaps upon some undiscovered structure or organic...
Page 32 - The gasoline fractions of different crudes are composed of the same hydrocarbons, the differences from one crude to another being essentially in the relative amounts of the foregoing five classes of hydrocarbons.

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