Hi: Here are some interesting patents:
May 13, 1879 http://www.google.com/patents?id=ez5TAAAAEBAJ&dq=215381 - air synchronization http://www.google.com/patents?id=48BzAAAAEBAJ&dq=271347 - Electric & air winding & synchronization http://www.google.com/patents?id=JgRCAAAAEBAJ&dq=275700 - VICTOR POPP http://www.google.com/patents?id=JwRCAAAAEBAJ&dq=275701 - VICTOR POPP http://www.google.com/patents?id=nhpFAAAAEBAJ&dq=278159 - electric & air http://www.google.com/patents?id=725bAAAAEBAJ&dq=349494 - air synchronization http://www.google.com/patents?id=BlVyAAAAEBAJ&dq=362462 - air winding & synchronization http://www.google.com/patents?id=4H5rAAAAEBAJ&dq=567983 - air powers pendulum Jul 8, 1902 http://www.google.com/patents?id=a7RmAAAAEBAJ&dq=611822 - "Western Union" Electromechanical wind & Sync http://www.google.com/patents?id=sk1dAAAAEBAJ&dq=704333 - air powered self winding The "Western Union" Self Winding Clocks which were in use for a long time were based on patent 611822 4 Oct 1898, not that much different from the above. There may have been 500,000 of these in service. http://www.prc68.com/I/SWCC.shtml#Pat Have Fun, Brooke Clarke http://www.prc68.com Marc Bury wrote: > Some more details from the pneumatic clocks in Paris in 1880: > (Sorry for the g00gle-style translation) > > In "Le Magasin Pittoresque" in 1880, we can read an article entitled > "Unification of time on the electricity and compressed air". > > Regarding the pneumatic clocks, we read "... Already clocks operating with > this new system, invented by Mr. Popp from Vienna, have been installed in > Paris ... > A central clock is setup so that whenever the pendulum hits the sixtieth > second of a minute, there is a trigger switch that delivers the compressed > air in containers, it rushes immediately into the tubes of the network, and > inflate a bellows which is at their end. By blowing, the bellows raises a > small lever that rotates one step in a wheel that has sixty, and each > corresponding to one minute. At the same wheel is set the minute hand Dial > moving a minute ... > The installation of the first fifteen dials required eighteen kilometers of > pipes, and their establishment is such that all the people who live near the > pipeline network that can receive time at home. It is sufficient to hook a > small diversion conduct on the central pipe that brings home the compressed > air provided by the administration. " > > In another part, I read that the pressure pulse is maintained during the 21 > first seconds of each minute. > > Also I found a couple of pictures from such public clocks installed in the > streets. > http://www.casimages.com/img.php?i=090312075720411213302119.jpg > http://www.casimages.com/img.php?i=090312075720411213302120.jpg > > -Marc- > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
