726 



THE POPULAR SCIENCE MONTHLY. 



low upward along the axis of ' the water jet, the lamps being 

 placed in a chamber under the fountain provided with a trans- 

 parent roof. Color effects are produced by the interposition of 

 glass screens in the path of the beam. In the present 

 fountains, which rise from basins sixty feet in diame- 

 ter, the underground chamber is built upon piling, a 

 construction rendered necessary by the shifting sand 

 foundation. The piling is of unequal length, the 

 shorter piles supporting the floor structure, and the 

 longer, which project through and are seen as pillars 

 in the room, the roof. The water nozzles are grouped 

 to form nineteen composite jets, and as many power - 



Fig. 2. — Electbic Fountains. 



ful reflectors are arranged to throw a beam of light along the 

 axis of each group. It is estimated that the beam of these power- 

 ful lights has a luminous intensity of two hundred and fifty thou- 

 sand candles. The size of the fountains may be appreciated by 

 the fact that they require a twenty-four-inch supply main con- 



