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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869 Excerpt: ...selected about fifty of these groups of lines denoted by common numbers, and compared the lines of each group, the one with the other, by a simultaneous observation of the different metals to which they belong. Some of the lines were found to be too faint and ill-defined to admit of being more accurately determined in position relatively to each other, The following lines appear with ray instrument to be coincident: Zn, As 909 Na, a 1005 0, As 1737 Na, Pb 1000 Te, N 1366 Cr, N 2336 Of a much larger number of groups, the lines were, by careful scrutiny, observed to differ in position by very small quantities, corresponding for the most part to fractional parts of the unit of measurement adopted in the Tables. These are: Sn 459 Ba 6215 Te 657 Bi 837 "3 Co 937 Sb 1081 Te 1485 Zn 1797 Sb 458 8 Bi 621 Cd 656 Sb 837 Sb 937 5 Aul081-5 Fe 1485-3 Pd 1798 The character of the lines is indicated as follows: --A line sharply denned at the edges, and narrow when the slit is narrow, s. A band of light, denned as a line, but remaining even with a narrow slit, nebulous at the edges, n. A haze of light irresolvable into lines, h. Double band, too close for measurement, d. The comparative intensity of the lines is indicated by the smaller figures placed in the position of exponents against the numbers in the Tables....The scale extends from 1 to 10, and includes fractional parts of unity to represent the very faint lines. Na. K. Ca. Ba. 16173 16382 16511-5 16561-5 16591-5 16651 17451 1817-5 20211 s 20292 2060 h 21451 s 21761-5 s Sr. 19992 h Ag. Solar. Air. When the induction spark is taken in oxygen, a faint line is seen nearly in the position of the nitrogen line 1718 Since the lines of oxygen have a diminished intensity when the spark passes in air, this line wou...
