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Gsearch [sprague otis trolley elevator]
Author: WebDigger
Date: 08-20-2021 - 21:51

I hadn't realized Frank Sprague had made so many significant contributions, to both horizontal and vertical transportation. Nor had I been aware of the work of his descendants/survivors. -- [en.wikipedia.org]

Gsearch [sprague otis trolley elevator] -- [www.google.com].

Here's more about the man and his family -- Aunt Anna's Boys -- [paulwmarino.org]

Here are a couple of IEEE articles you may find interesting --
• Frank J. Sprague invents -- the constant-speed dc electric motor -- [ieeemilestones.ethw.org] [pdf]
• a Sprague invention -- multiple unit train control -- [www.nxtbook.com]

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