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Heliostats are gaining popularity as an economical method of daytime indoor lighting in sunny places. But this trend seems quite recent in relation the technology behind heliostats, these having been invented centuries ago.

Some solar power stations have heat storage, usually with molten salt, in addition to heliostats, and even these seem quite recent in relation to the technology involved, what if molten salt heat generation in conjuction with Heliostats had appeared in the 19th century?
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