The name Rocket comes from the Italian rocchetta, meaning "bobbin" or "little spindle",[37] given due to the similarity in shape to the bobbin or spool used to hold the thread to be fed to a spinning wheel. The Italian term was adopted into German in the mid 16th century, by Leonhard Fronsperger in a book on rocket artillery published in 1557, using the spelling rogete, and by Conrad Haas as rackette; adoption into English dates to ca. 1610.[38] Johann Schmidlap, a German fireworks maker, is believed to have experimented with staging in 1590.