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That is impressive. Have you seen the film, "Meet Me In St. Louis"? The final scenes of the film depict the main characters (all family members) at the Louisiana Purchase Exposition and they are looking at this scene as dusk arrives and the lights come on. It is very well done and gives a good idea of the spirit of this fair. I have learned that this fair was advertised at the Pan American Exposition in 1901 in the Missouri pavilion.

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I have plenty of black-and-white night view postcards from the 1904 St. Louis World's Fair, but color night views are much harder to come by. Here are a few examples:




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Seeing the night-time postcards reminded me that I didn't know who did the illumination. Somewhat difficult to find out, since most references lead to Tesla and Westinghouse at the 1893 World's Columbian Exposition.

However, I eventually found the full text of "The St. Louis electrical handbook; being a guide for visitors from abroad attending the International electrical congress, St. Louis, Mo., September, 1904":


Which states

"On the inside of the pillars forming the Colonnade are

vertical lines of lamps, each unit consisting of three

incandescent lights, the first having a clear bulb, the sec-

ond a ruby, and the third an emerald tint. This enables

many color effects to be obtained, as all the lights of one

color can be turned on or any combination of them can

be blended. This is obtained by arranging the colored

lamps upon different circuits.

The current supply is from a three-phase system, sep-

arate feeders extending to each color of light with a com-

mon neutral for all three. Water rheostats are arranged

in each circuit so that the effect of the lights gradually

increasing in brilliancy up to full power can be obtained.

With these different combinations set programs are ar-

ranged for the edification of the evening visitors."

"Three phase" of course must mean it was an alternating current system (a la Westinghouse/Tesla).

The text also says that they expected to use a total of a half million 8-candle power lamps, and arc lighting was not used because it would clash with the glow of low power incandescent lamps.

I also found a less credible source (it has mistakes about the first use of AC lighting) that says the Ferris wheel was powered by electricity in St. Louis. Other soruces say it was powered by a 1000 horsepower reversible steam engine in Chicago (plus it had a second steam engine for backup), and it seems more likely it was also steam powered in St. Louis. This may be sloppy research and refer to the illumination only. One source says it was illuminated by "Edison bulbs"; if so, it must also have had a steam engine with a DC dynamo. Can anyone provide a reference for the electricity source for the Ferris wheel illumination (as opposed to the Expo illumination)?

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