g One of the finest of luminous optical effects with water, and it is also found that this variation very over (he glass with thick shellac varnish as follows: which persistence of vision has to do is that known as closely follows the percentage of resinous matter con- Starting under the goblet at… … terminates i n size. The original of the photograph, Fig. 4, produced Fig. 4.—COLORED ELECTRIC STAR PRODUCED "WITH the center at the in this manner with a large generator, was over three Fig-. 2—LUMINOUS GOBLET. INTERRUPTED CONDUCTOR. feet across. Exquisite color effects may be secured by bottom.…
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![An illustration from XIV [i.e. Vierzehnter] Verbandstag Verband deutscher Juweliere, Gold- & Silberschmiede Strassburg, vom 7.-11. August 1914 : verbunden mit einer Ausstellung alter & neuer Goldschmiedearbeiten und Uhren (1914)](https://img.insideoutlibrary.com/img/200/ia-xivievierzehnter00stra-27-8.webp)
