H. C. Long. Skate Device. Application Filed May 8, 1920. Patented June 7, 1921. [Original Patent Document].
[Washington, D. C.]: United States Patent Office, 1921. 28 x 19.5 cm. Two pages of illustrations on two leaves (recto only), plus 3pp of printed text; stapled together at lower margin. Light soiling and toning; hole punched to first leaf and taped over; black marker and evidence of sticker removal to corner of first leaf; stamps ("Amusement and Exercising Devises" and "Draftsman"). Good+.
Patent document for a wildly improbable invention that, amazingly enough, appears to have been used successfully by the inventor: a skate affixed to a helmet which the wearer could use to skate down a ramp while balancing on his or her head. Hillary C. Long was a Ringling Bros. circus performer who, if a Ringling Bros. poster in the Huntington Library collection is telling the truth, "puts his skates upon his head and wears his hat upon his feet while accomplishing apparently impossible stunts," like hopping down stairs and skating down a divided ramp on his head. (See https://hdl.huntington.org/digital/collection/p16003coll4/id/2035/).
The patent includes drawings of the skate helmet, as well as a detailed printed description of its components, etc.