Rumford, Benjamin, Graf von, 1753-1814, American Academy of Arts and Sciences · Boston · leaf 60
es the field of the photometer; but, assoon as by turning the cylinder about its axis thatwino- is made to emerge from the shadow of thecylinder on one side, the width of the shadow on thefield of the instrument will be increased. By thesemeans the widths of the two shadows which are com-pared may… … of the Light emitted by Luminous Bodies. 43 periment, are placed at different distances from thefield of the photometer, the shadows of the two equalcylinders, unassisted by their projecting wings, will ofcourse be of unequal widths. To bring their widthsto be equal was the sole object of the…
