Assembled clippings from U. S. Patent 2,757,000, "Bowling pin-setting mechanism", including Figure 2, altered by uploader to highlight candlepins in blue.
Collage of excerpts clipped from U.S. Patent 2,208,605 -- "Bowling pin setting apparatus", issued to Gottfried J. Schmidt on July 23, 1940.
1895 Bowling lane in cross section, showing screw-adjustable mechanisms on sides and in middle, to facilitate straightening and leveling of the bowling alley surface.
Newspaper article (The Oregon Daily Journal, Portland, Oregon, U.S., November 7, 1905) reporting winning of a ten-pin bowling tournament with a Brunswick Mineralite bowling ball