Here is the 1919 catalog scans... Take a look at the sets and the Ludwig Alternator Pedal which is a remote pedal! It dampens the snare drum and cymbal for different playing techniques.
[IMG]http://www.vintagedrumguide.com/images/ludwig_sets/1919-ludwig-drum-sets-4_th.jpg[/IMG]
1919 Ludwig & Ludwig Snare Drums
[IMG]http://www.vintagedrumguide.com/images/ludwig_snaredrums/1919-ludwig-snare-drums-6_th.jpg[/IMG]