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MMD > Archives > December 1996 > 1996.12.07 > 06Prev  Next

Lock and Cancel Valve Design
By Matthew Caulfield

Damon Atchison asks about a design for a lock-and-cancel valve. Durrell Armstrong's Player Piano Company sells one, which looks from the illustration like it is made out of two Wurlitzer unit blocks and some channeling of no great complexity. Anyone who understands pneumatic valve operation could design his own. All you need to do is have one Wurlitzer or Lauter-Humana block (or similar channeling in a block of wood) arranged so that when the "on" tube from the tracker bar opens to atmosphere, tripping the valve, the valve by some pneumatic or mechanical action maintains that "on" tube open to atmosphere via a teed connection. The cancel valve, when it is tripped by the "off" tube from the tracker bar simply momentarily blocks the continuously-open-to- atmosphere connection to block 1, causing block 1 to return to closed position and remain there until another "on" signal starts the cycle over again. I _love_ pneumatic valves!

In another note, Damon asked us to fill in the blanks in this: Tickle The Ivories, played by Walter H---er. Our own Rob DeLand's roll catalog has the answer: QRS Autograph Roll 100066 is "Tickle The Ivories", played by Joe Collins, composed by Wallie Herzer. The same catalog lists one other roll composed by Wallie Herzer, but none played by him. So far I have come up cold on Damon's other mystery, in which he asks us to complete the title: "When You Wore Wh------". Monday I'll take a look in the ol' copyright files.

[ It might be "When You Wore What I Wore"(?), telling of two ladies
[ who discover that they're wearing identical dresses ! -- Robbie

(Message sent Sat 7 Dec 1996, 21:19:16 GMT, from time zone GMT-0500.)

Key Words in Subject:  Cancel, Design, Lock, Valve

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