Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 559
candles. Inside of the box at the top and bottom of the windoware two horizontal broad bars (Fig. 3). the space between them * Communicated by the Director.E. T. Z.. 38, p. 188, 605, 1917. 543 544 Notes from Nela Research Laboratories. [J-F. I. bein^ adjustable by handwheel H. Hence the vertical… … from the apex of the V to the point midway between the hori-zontal bars. This window is placed about 30 cms. from thephotometer screen and illuminates it directly. The sphere window, of a type originated by the EngineeringDepartment several years ago, has two rough-ground flashedopal glass disks at…
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