- Wrote a short story called "'Futility" in 1898. It was about an unsinkable luxury liner called the "Titan'" that strikes an iceberg on its maiden voyage and sinks into the sea. After the sinking under eerily similar circumstances of the "Titanic" in 1912, it was re-published as "The Wreck of the Titan".
- Another story by Robertson, titled "Beyond the Spectrum" and published in 1914, tells of a sneak attack on the US naval fleet in Hawaii by Japanese ships, which leads to a war between Japan and the US.
- Invented a periscope that he sold to a submarine builder for $50,000.
- Found dead in his hotel room in Atlantic City, NJ, on 3/24/1915. Cause of death was listed as a heart attack brought about by an overdose of paraldehyde.
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