stnicUircs a hiiiiiiiDus clTccV never l)efore ol^tained. These towers 

 further illustrated the preservation of (le])th. or the third dimen- 

 sion in li^iit. wliich feature predominated throu.^hout the Expo- 

 sition. The Tower of Jev/els was flood-lii^hted by batteries of 

 arc projectors located on the roofs of the main group of pal- 

 aces, the South Garden pavilions and the Scott Street entrance 

 gate. In order to obtain the proper gradation of light with an 

 economic distribution, it was necessary to equip the majority of 

 the projectors with properly designed diverging doors. A com- 

 plete set of color screens at each projector enabled the changing 

 of the color tone of the tower on very short nitice. The base 

 section was necessarily carried in the same relative illumination 

 as the building facades. Above this section there was a rising 

 illumination to approximately 20 foot-candles on the top ball. 

 The average value for all levels was 10 foot-candles. The shad- 

 ows cast by the rising searchlight beams Avere illuminated by 

 rose red relief lighting. At the top level there were four 30-in. 

 (762-mm.) arc projectors equipped with changeable color 

 screens for spectacular and heightening effects. The twin Ital- 

 ian towers at the entrances to the Courts of Palms and Flowers 

 were lighted in a similar way. 



THE ELECTRIC-STEAM COLOR SCINTILLATOR.— 



The scintillator consisted of combining searchlights in systematic 

 drill in colored and white beams with smoke and steam, so as to 

 produce spectacular effects or fireless fire-works, both aerial and 

 on the ground, possessing artistic color combinations and blend- 

 ings impossible with ordinary fireworks. This was further en- 

 hanced by the running of a large express locomotive at high 

 speed imder brake so as to produce large volumes of smoke and 

 steam which were illuminated in color. Other steam effects were 

 in the form of fans, plumes, wheels, fighting serpents, etc. This 

 battery was composed of 48 36-in. (914-mm.) hand-controlled 

 arc projectors. They were operated at nominal 110 volts, 110 

 amperes, and with the resistance consumed a total of 581 kw. 

 The beam candle power of each was approximately 55,000,000, 

 or an aggregate of 2,640.000,000 for the battery. With the 

 equipment of each projector was a set of seven colored gelatine 

 screens, treated with spar varnish and turpentine as a protec- 

 tion against moisture. 



The locomotive, steam apparatus and fireworks mortars were 

 located on the south breakwater of the yacht harbor. In addi- 

 tion to supplying the various steam effects such as plumes, chro- 

 matic wheels, fairy feathers, etc., this locomotive, which was a 

 modern Southern Pacific oil-burning passenger type, was blocked 

 up and locked so that the wheels could be driven at a speed of 

 60 miles (97 km.) per hour under brake. Thus great volumes 



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