1949

Popular Mechanics was founded in Chicago by Henry Haven
Windsor, with the first issue dated January 11, 1902. His
concept was that it would explain "the way the world works"
in plain language, with photos and illustrations to aid
comprehension.

For decades, its tagline was "Written so you can understand
it." The magazine was a weekly until September 1902, when
it became a monthly. The Popular Mechanics Company was
owned by the Windsor family and printed in Chicago until the
Hearst Corporation purchased the magazine in 1958. In 1962,
the editorial offices moved to New York City.
(From Wikipedia, the free encyclopedia)

Henry Haven Windsor
(1859-1924) 

Popular Mechanics first cover (January 11, 1902)