Below is a drawing of John Lazelle who was one of two innovators in the late 1960's to construct and perform the first musical stringed drones. Below is a drawing of John by artist Frank Goad from a photograph taken in the late 1970's.
John Lazelle made a number of drones as well as drums and flutes. Some of the drones were as small as three feet with the largest 15 feet in length made from an aluminumm semi truck chasis with 25 strings and electric pickups. Another made from stainless has 125 steel strings (same size) 4.5 feet by 15" x 1 foot tall. The drones are played with steel bars sliding on the strings while picking or strumming the strings. Tapping on the strings or using the bow are alternative methods for activating the strings.
Sorry, no drone photos yet. Soon.
The photo below was taken in 1973/74 with John performing at Santa Barbara City College. Geoff's first large array midrange cabinets are seen in the background.