How to best practice drum slides

[Austin]

Me and my teacher are getting close to the end of Bradbury part one on to the gauchos gallopade nearly, I'm looking a bit ahead but I want to know what's the best way to practice getting your drum slides in time?

[Joel Hooks]

With little effort, and looking through the first copy of Carcassi I could find. 

From the 1853 edition of Carcassi, Ditson, which predates any banjo method by two years:

that is a description of the "Drum Slide" by a different name.

Full book:

https://archive.org/details/newimprovedmeth00carc/page/110/mode/1up

[Byron Thomas]

If you want to see it in action watch the Gordon Dando video on Chris Sand's Youtube page. Horace Craddy does it in the song that starts at timestamp 50:40. Gordon Dando's Classic Banjo