In 2000 the North American Sundial Society held its annual conference in San Francisco and visited the Ingleside Terraces Sundial. A century ago the site was a racetrack and as it turned into a housing development in 1913, a promotion sundial was installed with the advertisement  "largest sundial in the world".  Michael Callahan of "This Forgotten Day in San Francisco" talks about this historic dial and the developer Joseph A. Leonard of Urban Reality Improvement Company on November 15, 1913.

Read more at: http://www.sfgate.com/video/article/Forgotten-6629958.php