Sentence:  Not wishing to lose this great opportunity of being the first to receive <WSD>Martian</WSD> signals, we 'phoned to the manager to come over immediately and verify our "startling" discovery. [...] A day later a lineman in the employ of a stock quotation ticker agency happened to be working on the roof. [...] [H]e suggested that we might possibly be troubled with induction from these wires, and that our lead-in would perhaps be better if it ran along the outside of the building. Troubled with induction! In truth, that was the very thing which we had mistaken for <WSD>Martian</WSD> signals. 
Meaning of the word marked with <WSD> tags:  Of or relating to the planet Mars, or  its imagined inhabitants. (from 19th c.)