Ball shaped tweeters: any success?

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In German magazine funkschau 22 1956 was description of some ball-shaped tweeter. According to the article, tests of such omni-directional speaker was promising, but I have not seen anything real.

Does anybody have any information?
 

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Given that we haven't seen that many of them over the last 57 years I assume they were not that much of a success.

Looking at the drawing I don't think it would have been truly omni-directional.
Horizontally it certainly covers 360deg but vertically it would appear while the equator expands pole-to-pole shrinks. This would limit vertical dispersion to around 90deg I'd guess.
 
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