84 



SCIOPTICON MANUAL. 



to produce countless variations in the effects developed, 

 by which an endless variety and constant novelty can 

 be secured. 



For this purpose there is needed in the first placed the 



simple apparatus 

 shown in our wood 

 cut, consisting of a 

 small tank, made by 

 securing two plates 

 of glass, about 4x5 

 inches, with four 

 clamps, against a 

 strip of rubber 

 about inch thick, 

 bent into the three 

 sides of a rectangle 

 and notched at the corners to facilitate its bending. 



"We then require one or more glass pipettes provided 

 with elastic balls, such as are made by the rubber manu- 

 facturers. This little apparatus is shown in 

 Fig. 27, where A is the rubber ball, B the 

 glass globe of the pipette, and C its point 

 drawn to a moderately fine orifice. 



A few small pipettes made by simply draw- 

 ing short pieces of glass tube to a fine point, 

 are also useful. 



In addition, a few bottles with such ordi- 

 nary chemicals as will be mentioned further 

 on, will complete the outfit. 



Having placed the tank, three-quarters full 

 of water, as an object in the lantern, a num- 

 ber of chemical reactions can be shown, as 



J?l*/.X,f, 



follows : 

 Experiment 1st. Pour in a little solution of sulphate 



