256 THE BOOK OF THE LANTEKN. 



hot glue and weight operation must be repeated, until the 

 batch, say two dozen slides, is complete. When com- 

 plete, this batch, with a piece of blank board at each end 

 of the pile, may be screwed up between a couple of car- 

 penter's cramps, and left before the kitchen fire all day or 

 all night, until the glue is thoroughly hardened. When 

 quite dry and hard the slides may be separated and again 

 arranged between the cramps, in such a position that their 

 edges can be run over with a sharp plane. After this they 

 can be separately rubbed on every edge with glass paper, 

 and, when dusted, they are finished. 



The advantages of these carriers are many. Firstly, 

 you may drop one from a height of 6 feet from the floor 

 with absolute impunity. Secondly, if the zinc patterns 

 be correctly cut, the slides will register correctly with one 

 another. Thirdly, six dozen, which is about the usual 

 complement for a lecture set, will pack in the space 

 occupied by three dozen under the old system. The sole 

 disadvantage pertaining to these carriers is, that the pic- 

 tures cannot be readily shifted from one to another. The 

 remedy is obvious. For lectures of an ephemeral cha- 

 racter, I mean for those the subject of which is merely 

 of passing interest, use the old form of carrier, but for , 

 more permanent ones adopt mine. 



LANTERN LEGS. 



It is given to a few to know what it is to arrive at a 

 schoolroom or other lecture-hall in some remote country 

 district, and to expect to find a few conveniences ready to 

 hand. The first thing to ask for is a table, upon which 



