Tapping techniques and solos on various stringed acoustic instruments such as the banjo have been documented in film, records, and performances throughout the early 20th century. Various musicians have been suggested as the originators of modern two-hand tapping. While one of the earliest players known to use the technique was Roy Smeck (who used a tapping style on a ukulele in the 1932 film "Club House Party"), electric pickup designer Harry DeArmond developed a two-handed method as a way of demonstrating the sensitivity of his pickups. His friend Jimmie Webster, a designer and demonstrator for Gretsch guitars, made recordings in the 1950s using DeArmond's technique, which he described in the instructional book "Touch Method for Electric and Amplified Spanish Guitar", published in 1952.