In much laboratory work simultaneous observations are made on two dependent quantities, all others being kept constant. A relation is then sought between these quantities. One of the first recourses is to logarithmic and semi-logarithmic plotting. By dimensional reasoning, relations involving other quantities may then often be inferred, even without further experimentation. A device that combines speed, accuracy, and simplicity for this sort of plotting is therefore desirable as a laboratory adjunct.
In this paper the theory of logarithmic and semi-logarithmic plotting is reviewed, and a device is described which, it is thought, meets the above demands.
The theory of power and exponential finding, especially as the inverse of logarithmic and semi-logarithmic plotting, respectively, is also reviewed, and a simple addition to the above apparatus is described, by which one can read powers and exponentials.
© 1923 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
R. A. Castleman
J. Opt. Soc. Am. 16(4) 287-292 (1928)
Walter P. White
J. Opt. Soc. Am. 8(6) 767-782 (1924)
J. Opt. Soc. Am. 29(7) 267-277 (1939)