Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 648
Daylight photoorraph showing positious aud character of shadows. Note shadowcompare with those shown in artificial light photograph below. (Min. illumination in shadows nndercases at left-hand side.Max. illaniination in centre of passagewayshown in foreground of photograph. ) 111 (k)ur aud = 11-5 … Artificial light photograph of room shown al)i>vi. HhowmK )iosiIioiik und cliiiraclcr of shadowo.Note shadows under specimen cases and compare with daylight photograph nbove. Shadow Ratio (Min. illumination in shadows under \cases at left-hand side. IMux. illumination in centre of pas.ageway…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
