Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 420
photometer, shown inFig, 57, is very compact and is especially.adapted to measuring intensity of illumination aswell \as the value of licrhtsources; it may be used forexploring the illumination ofrooms or the lighting ofstreets. This apparatus consists ofa tube A, Fig. 58, which ismounted… … Fig. 57. L. I)U r II1 no- uenzi ne, IS mounted at the end of this tube. The benzine used should be aspure as possible, and the flame height should be carefully adjnstedto 20 mm. when takino; readincrs. At rijrlit anHes to the tube Ais mounted the tube B which contains an eye ])iece at (), a Lum-…
Architecture · Building · Carpentry
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Original microscopic drawings made between the years 1824 and 1840 mostly published in works by Dr. Goring & A. Pritchard [graphic]. (1824)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b21301177-83-1.webp)
