| Or. Red.| Or. Red.| Or. Red.| Or. Red. 1 |10·6 ·9 1·5|6·4 4·4 5·7|2·6 7·8 1·1 | 5·2 3·4 10·4 2 | 9·2 1·4 2·9|6·2 5·3 5·5| ·1 ·7 ·4 | 7·8 3·0 5·2 3 |10·8 1·2 1·5|7·2 3·4 8·4| ·7 2·0 ·2 | 9·2 1·6 5·2 4 |10·0 2·0 1·5|6·2 4·4 6·9| ·5 1·0 ·7 | 8·2 2·0 7·3 | | | | 5 | 9·6 4·4 4·5|5·8 5·0 7·2| ·2 1·9 ·7 | 6·2 3·8 6·5 6 | 6·6 7·9 5·0|4·8 7·2 5·0| ·2 ·5 ·55| 5·0 7·5 2·0 ---+-------------+-------------+--------------+--------------- BRIGHT SUNLIGHT (South), 18--9--12. 10 Minutes’ Exposure on White Sensitized Papers. ---+-------------+-------------+--------------- NO.|GREEN SCREEN.| BLUE SCREEN.|VIOLET SCREEN. ---+-------------+-------------+--------------- |Blk. Or. Red.|Blk. Or. Red.|Blk. Or. Yel. 1 | ·26 ·69 ·10|5·2 4·4 8·4 |1·75 3·65 ·40 2 |-- ·15 ·03|6·0 3·8 6·7 |1·7 3·9 ·40 3 | ·22 ·02 ·04|5·6 5·9 6·5 |1·5 3·5 1·2 4 | ·19 ·05 ·12|4·8 5·6 6·6 |1·3 3·2 -- | | | Red. 5 |-- -- -- |4·0 10·5 2·0 | ·6 1·7 1·0 6 |-- -- -- |4·0 11·5 1·0 | ·5 1·9 1·1 BRIGHT SUNLIGHT (South), 18--9--12. 20 Minutes. | Or. Yel.| Or. Red.| Or. Red. 1 |3·1 6·1 1·8 |8·0 2·0 8·5 |4·5 7·5 4·5 | | Or. | 2 |1·9 3·7 ·8 |8·8 ·6 3·6 |5·0 6·5 4·5 | | | 3 |1·0 7·0 1·6 |8·6 1·4 3·5 |4·0 8·5 4·5 | | | 4 |1·8 4·8 1·2 |8·0 2·2 6·8 |4·5 7·5 4·5 5 |1·7 4·9 1·4 |7·6 2·4 8·0 |4·0 8·5 4·0 | Red.| | 6 |1·8 3·4 ·4 |6·4 4·4 8·2 |3·5 8·5 1·0 BRIGHT SUNLIGHT (South), 18--9--12. 30 Minutes. | Or. Yel.| Or. Red.| Or. Red. 1 |1·0 6·8 ·2 |6·4 2·6 7·5 |4·2 6·8 6·0 2 |1·8 3·4 ·2 |8·4 ·8 3·8 |5·4 8·1 1·0 3 |2·2 5·2 2·2 |8·0 2·0 7·5 |4·5 8·5 4·0 4 |2·5 4·7 2·0 |8·0 1·6 7·4 |3·7 10·3 1·0 | | | Yel. 5 |1·6 4·2 2·8 |7·6 2·6 6·8 |3·1 9·4 1·5 6 |1·5 3·9 ·2 |6·4 7·6 5·5 |3·4 9·7 1·5 ---+-------------+-------------+--------------- It would be unsafe to draw definite conclusions from a few experiments, but so far as permissible, the results show considerable differences, both in depth and in colour, of the energy of the different rays, for instance-- Compare Nos. 1 and 6 under 20 min. sunlight. Black. Orange. Red. No. 1 10·6 + 1·4 + 5·0 No. 6 6·2 + 4·6 + 7·7 or again 3 and 6, the maximum and minimum, under 30 min. exposure. Black. Orange. Red. No. 3 10·8 + 1·2 + 1·5 No. 6 6·6 + 7·9 + 5·0 The sensitiveness of Nos. 2, 4 and 5 appears to have been exhausted by 20 min. exposure to sunlight, further exposure showing no reaction; whilst the sensitiveness of Nos. 1, 3 and 6 do not appear to have been exhausted by 30 min. sunlight exposure.