RARE 1928 Elmer Sperry Submarine Salvage Ship Proposal USS S-4 [Naval History] For Sale

"The Lee-Making Salvage Ship for Universal Service"Author: Elmer A. Sperry
Date: March 20, 1928
Format: 8-Page Typed Document on Historical Onion-Skin Paper (Carbon Copy Era)HISTORICAL OVERVIEW:
Original 1928 8-page technical proposal by legendary American inventor Elmer A. Sperry (founder of the Sperry Gyroscope Company). Written immediately following the tragic December 1927 sinking of the USS S-4 submarine, this document outlines Sperry’s visionary concept for a specialized salvage vessel. The ship was engineered to use active gyrostabilizers to create an artificial "lee"—a calm zone in turbulent seas—allowing deep-sea divers and rescue chambers to operate safely during severe storms.The end of the document features the typed name Elmer A. Sperry and the date March 20, 1928 (Note: This is a typed attribution from the era, not a hand-inked signature).

Paper: Original, delicate onion-skin paper typical of late-1920s office duplicates.

Flaws: No tears or rips. Expect light, natural age-toning/yellowing consistent with a 90+ year-old document. Text remains crisp, dark, and entirely
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