Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 420
Fig. 56. The Weber Photometer. As an example of a portable typeof photometer, we have the Weber. This 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…
Architecture · Building · Carpentry
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