60 PHOTOGRAPHIC FACTS AND FORMULAS 
Amer 
Phot 
LUG AEY VERIRIR ENN eV Sian) elles on) bi fos! pla 1 
Wellington Film ..........20.2. 1 
Wellington Ortho Process ....... 9 
Wellington Ordinary ..........- 4 
Wellington Speedy Portrait ...... 1 
Wellington Extra Speedy ........ 4 
Wellington Iso speedy & Anti-scr. . 1 
Wellington Studio anti-screen .... 
Wellington Press & Spec. extra speed. 1% 
Wellington Xtreme .........2.06 yy 
Wellington super Xtreme ......-. % 
Wratten Panchros|) .(...:s sc «s/ei0 ls» « 1% 
Wratten Panchro. Process ....... 5 
Wratten Panchro. M ........... 5 
" B.W. Wat. Wynne Har. T.D. 
1/ 86 
6 180 vs 
160.) 180. i, 86 M 
1 32 85 MM. Swe 
% 90 60 Q 
1/6 180 86 @G M 
16) 2500) (AER ae M 
1/6. 180. “seu M 
1/16 500 143 E MS 
1/12, 350. «12098 Ss 
1/12) 350 .; 2200s Ss 
1/16 500’, 142 ae vs 
16.) G80 yee MS 
Me i ee 
1e GB yoo 
Exposure.—The following table shows the exposure cor- 
responding to the number found by adding the five factors. 
Bian) a8 Ny ag 
———_—_— |] | | |] 
fe ———— 
D an he 2A 
+f 
: 10: x 
135 
or 153 § 
cf SY Ss 
— | Ef | | 
30 
2314) 24% | 24ry 
Bae |) S658 aes 
303 
ee 
