Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 162
chner, for one can alwaystrace the curve of log / experimentallyas a function of I, as has been explainedabove. The method discussed in the aboveanalysis seems to solve, as completelyas one can expect, the problem of deter-mining the range of a projector in practice,Engineers and officers employing… … Fig. 2. Cartesian Co-ordinates. On the scale of ordinates OY the logarithms of / are markedout, and the scale is graduated in terms of /.The abscissa OX carries values of x and thescale is graduated in terms of x. ABC re-presents the relation log /=4+if+2 log X. In this case a = l. ODj is a…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
