ro- dinary instrument, and has manufactured a large number of may claim our attention when we look at the condensers in posed, of using a small picture with large condensers, by such instruments, which are now in use in the principal col- their relation to the objects and object glasses or… … poses of demon- Thus such an attachment to his ordinary lantern was made ment, the image of each Fig. 7. j. ±tr. i«. stration, which has by Duboscq, at least as early as 1868, as the present writer would be equally bright: been heretofore constructed. But while it is desirable to is informed by Dr.…
