Document 9Lq0zYv5YnqmZKjverda7DKZV

784 S. K. O0TH AND E. A. LINSDAY Lighting for seeing > \ \N V *1 if i'lfA (4, - .. ll'.tily;; .skv-vji./'Usl'tr '* V> u V **V't) I ' 'ft 785 Figure 35. Inspection"6f pecans. Black light makes woriny pecans glow,'whereas good ppi.ans.ar unaffected, thus making it.a simple tasl^ to sort.out'and reject.the^wormy ones ' ..... ... ^ Figure .37. Clode iip^viaw^| len in the bad 1 .spacing of dark and l_g $W S'a ground-glass Shed by the closeness Figure 36., metal airplane lamp; plastic mod tions. Black ligfit'Vu&ed in metal'ihdiistnes. for the lhspectioniof cracks iiin partB. Polar.izedfcl.ighfcJnds^ta-appiicaiion^ui^^tuitiflg.as.tsgjig..as<jastaJj.h transparent parts and plastic models of metal parts. Where; /Very small igbjje' are being inspected, magnification and projection facilitate:.the;;processi),C!^l|i lieht is an ideal solution for inspecting color proofs in the printing industra1' " ' .$1 " Colored light for color printing, Bulletin LS-122, Lamp Division, General EtSSjaL May, 1949. ^Figure 38. A smalt amouhtlbf optjcAtinaghificahbnush>ro.vid'edby'&ii<inspection(Unit'that' Ha circline fluorescent lamp as its dight source. 'Herel-the ''operator can `Bee fine dctail'mtlch :`-r without having to contend with objectionable shadows.