lOO 



THE POPULAR SCIENCE MONTHLY. 



The parts which have been already described being completed, 

 proceed to fix them together with glue. Their correct position can 

 be seen at a glance by reference to Fig. 12. 



Fig 8. 



Pig. 9. 



First fix the cradle, 6, upon the rod, 4 within three-quarters of 

 an inch of the end next the tube, 5, upon the cradle, as shown. The 

 stage and support can next be fastened, but first insert tlie paper 

 tube, Fig. 11, in wooden tube, 5, and measure the most convenient 



Fig. 10. 



place to fix the stage, so that the object-glass can approach the object 

 without bringing the tube too low down. A trial will at once fix the 

 proper spot. 



The legs are attached by screws to the cradle, as seen in Figs. 

 1 and 2. The whole being now in form, clean and French-polish. 



Fig. 11. 



Also paint the inside of the paper tube a dull black, using drop-black, 

 turpentine, and a little Japan varnish to fix color, and the outside 

 with a mixture of Indian and common inks. Finally, line tube, 

 5, with a piece of fine cloth. If this is neatly done, the paper tube, 



