David, thank you so much for this info. That fly-swat patent is a real find and has made my day!
I'll check out your other links tonight when I have a moment.
Re the first drummer to use them, we'll probably never know as the first jazz didn't get recorded until 1917 and, by the look of things, brushes had already been around for a while.
I think the earliest recording I've come across so far is the Fletcher Henderson recording Copenhagen. I say think as the brush sound (if that's what it is) is pretty 'unique'. There's a section where you hear a percussion effect like a wet rag being slapped on a hard floor. This same sound can be heard on the track Knockin' A Jug by Louis Armstrong and his Orchestra in 1928. The drummer, Kaiser Marshall, played on both tracks and is definitely playing brushes on Knockin' A Jug: you can hear the sweep.
I've experimented with dead-sticking brushes on the drum head, using either hand, and provided a little force is used the sound is remarkably close to the effect Marshall achieved. Not exactly a sensitive performance, and not a style I'd like to emulate, but it does suggest that Marshall was using brushes during part of Copenhagen. No sweep though, so that style seems to have only come about in the late 20s (Zutty Singleton, mainly).
I've joined the discussion group of http://www.redhotjazz.com so hopefully I'll get some more input from early jazz enthusiasts. If anyone wants to hear the tracks I mentioned, here are the links (scroll down for recordings):
http://www.redhotjazz.com/lao.html
http://www.redhotjazz.com/fho.html
Look forward to reading your paper. Again, many thanks!
Gerry