[Q]: Sentence: A variation of the incandescent lamp did not use a hot wire filament, but instead used an arc struck on a spherical bead electrode to produce heat. Question: What did an alternate version of the incandescent lamp substitute for a wire filament?
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[A]: yes

[Q]: Sentence: The Allied leaders were "thunderstruck" by this from a political standpoint, though none of them had offered Eisenhower guidance with the problem in the course of planning the operation. Question: What geographic area was the primary objective of Eisenhower?
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[A]: no

[Q]: Sentence: To save space and for ease of reading, these are typically circular devices rather than the classic linear slide rule shape. Question: What is the slide rule used for?
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[A]:
no