A Manual Of Photography

PORTRAITURE BY THE DAGUERREOTYPE. 107 of the violet rays, as was first suggested by ^0WE,^f MLSMS in England, who having somewhat modified -P arrangements, succeeded still better in obtaining copies of the ^ of this description is constructed as follows. 12. Fi^. 12 is a sectional view of the apparatus. .At one end of a box shaped as in the figore, midhaving a^ to the lotted” lines5 and 'will he thence reflected to me Forhas certainly the advantage of àÈg°^eà quantity of light upon the plate, but it has à greats advantage of limiting the size of the ' Retures which of seven inches diameter, we only procu P$ leng will be perfect over two square niche ,ipng-th of three inches diameter and fourteen 1nebes^ length, pictures of a foot square may where single objects be seen that the mirror is only applicable wnerc g J "V ^„T^the sensibility of the surface of the plates was Eventual y Goddard appears to have been the greatly increase - combination with iodine ; and it was first to employ M olaudet and others, that chlorine subsequently to ) to the same extent as the had an accelerating power, but not w br°TheTe discoveries led to that amazing degree of sensitiveness which now enables us, in good light, to take a picture in less than a second of time.