Bryn Mawr College monographs . he printed page from which theoblerverfeadwas when held in the horizontal position. cp. per sq. in.; inthe 45 deg. position, cp. per sq. j 6 The bright spots on the doors of the apparatus case rated at 100 cp Pf »;^2en the^°Ttin Fig. 2, were not in the field of view when the tests were taken. That is when the tesiwere taken, the doors were thrown open, and all of the apparatus which might giv(specular reflection was removed. fc^ -^ c ,053 ?^^ H^L^ i ? .war .coa r M r < 11 HH ???j ?m^^H HUH 9 |H ^H H mn t ^^^^^^^1 ^1 ^^^H ^Hh ^1^1 { „„ ^^m ? B
Bryn Mawr College monographs . he printed page from which theoblerverfeadwas when held in the horizontal position. cp. per sq. in.; inthe 45 deg. position, cp. per sq. j 6 The bright spots on the doors of the apparatus case rated at 100 cp Pf »;^2en the^°Ttin Fig. 2, were not in the field of view when the tests were taken. That is when the tesiwere taken, the doors were thrown open, and all of the apparatus which might giv(specular reflection was removed. fc^ -^ c ,053 ?^^ H^L^ i ? .war .coa r M r < 11 HH ???j ?m^^H HUH 9 |H ^H H mn t ^^^^^^^1 ^1 ^^^H ^Hh ^1^1 { „„ ^^m ? B H H ^^^^H L ^^^B aS ^1 H ^^M ?B ^H I ^^^^^^^^^^^^1 mb9 ^^^^^^1 ^^^Hl ? ^ il ^m H^H ^?: 1 1 1 1 f i ^?1 1 Fig. 3.—Showing brightness measurements of all surfaces having very high or verylow brilliancj, semi-indirect system. The brightness of the printed page fromwhich the observer read was, when held in the horizontal position, cp. persq. in.; in the 45 deg. position, cp. per sq. Pg- 4—Showing brightness measurements of all surfaces having very high or verylow brilliancy, indirect system. The brightness of the printed page from whichthe read was, when held in the horizontal position, cp. per .sq. in.;in the 45 deg. position, cp. per sq. in. 453 fe:rrEE and rand: efficikncy oi? the Eye sented.^ The other three positions are indicated in the photo-graphs by (x). They will be referred to in the tables and charts,in order, by the numerals II, III, and IV. Table I shows the number and wattage of the lamps used atthe outlets A, B, C, D, E, F, G, and H; and Table II shows theillumination measurements for each of the 66 stations repre-sented in Fig. I. These measurements were made with the re-ceiving test plate of the photometer in the horizontal, verticaland 45 deg. planes.^ * The track along which the test card was moved was parallel to the east andwest walls of the room. During the three hours of reading which intervened be-tween
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Keywords: ., bookauthorbrynmawr, bookcentury1900, bookdecade1900, bookyear1901
