Hypocycloid prove that an epicycloid with "k" cusps moves snugly inside one with "k"+1 cusps. The evolute of a hypocycloid is an enlarged version of the hypocycloid itself, while the involute of a hypocycloid is a reduced copy of itself. The pedal of a hypocycloid with pole at the center of the hypocycloid is a rose curve. The isoptic of a hypocycloid is a hypocycloid. Curves similar to hypocyloids can be drawn with the Spirograph toy. Specifically, the Spirograph can draw hypotrochoids and epitrochoids. The Pittsburgh Steelers' logo, which is based on the Steelmark, includes three astroids (hypocycloids of four cusps).
Herman Fisher of the wooden blocks in 1934, the first to use plastic in 1950 in Queen Buzzy Bee’s wings and the creation of “National Baby Week” in the fifties. Herman Fisher Herman Guy Fisher (November 2, 1898 – September 26, 1975), was born in Unionville Pennsylvania. He is best known as the co-founder of the famous toy brand Fisher-Price. Herman G. Fisher was born in Unionville, Pennsylvania in 1898. He graduated from the Pennsylvania State University where he was a member of Sigma Pi fraternity in 1921 with a BA in Commerce and Finance. In 1930, he got together with Irving