246 THE BOOK OF THE LANTERN. 



The opaque lantern was first devised by Chadburn, and 

 for a long time was known by his name. Its construction 

 is simple enough. The object is so placed that it can be 

 strongly illuminated by the condensed rays from either 



one or two limelights ; an objec- 

 tive lens being used to form the 

 image on the distant screen. 

 The annexed diagram, fig. 63, 

 will explain the relations of the 

 different parts of a good opaque 

 lantern. LL are the limelights, 

 CC the condensers, O the ob- 

 jective, and E the object to be 



shown. At one time, a large instrument of this type was 

 made for casting the image of a human face on the screen, 

 the lenses being of immense size. I saw this instrument 

 at work more than once, but its effect was most dis- 

 appointing. It certainly was not worth the trouble and 

 expense incurred in its construction. It was, of course, 

 fitted with a reversing lens, so that the face should appear 

 the right way up. The owner of this face, by the way, 

 suffered tortures during the short time of exhibition, for 

 the powerful limelights close to, and on each side of his 

 head, were so hot that they blistered his skin. He was 

 made to smile at the audience, and then to drink their 

 good health in a glass of wine, a refreshment which the 

 poor man really needed after his grilling. 



Under the name of Aphengescope a contrivance is now 

 made for fitting on to the ordinary form of lantern, thus 

 dispensing with the cost of extra lenses. With a lantern 



