A Word About Separate Tension, by George Burt Stone
One hundred years ago, separate tension drums were still something of a new thing. Single tension drums were perhaps slow to fall out of vogue because they had more in common with the traditional rope tension instruments used by drummers for the past century or two. In the case of rope tension drums, the simple pull of a leather tug tightened both heads simultaneously. The same principle was true of early rod tensioned drums, the only difference being the use of metal rods and claws rather than rope and leather to tighten or loosen the heads.