•You are quite correct, Bob. Momentum is the correct term for the effect where a body tends to continue moving in the same direction. I used the term inertia as this is a more widely used everyday word and still gives the reader the intended understanding. All the best, Nicholas Simons. ...

•Momentum is the quantity of motion in a moving body, and may be expressed as its mass multiplied by its velocity. Inertia is better stated as something that has to be overcome in order to produce a change of velocity, either at rest or moving. Steve Bentley Vancouver, B.C., Canada

•Nicholas Simons wrote: > The Watt's linkage consists of three pin-jointed links that create > a straight line motion without any recourse to a straight edge. Just to be nit-picky: It only creates an _almost_ straight line. However, the small "S swing" can be made as small as one wants. Regards Hara...

•Hi again all, Thanks to my friends here I have been able to locate most of the parts that are missing from my Weber Duo-Art. However, I'm still missing the L-bracket and linkages for hooking up the hammer-rail lift. If anyone has a spare part that they would be willing to part with, I would be extr...

•I have a customer that took the player action out of a Price & Teeple player before I could get there and document where everything is supposed to go. I have everything back except the bottom bellows assembly which has the stack cutoff box. All the leakage were also taken out. I found those except ...

•-- non-subscriber, please reply to sender and MMD -- We have a Weber Duo-Art that had been taken apart without a diagram on putting the soft pedal linkage back together. I have figured out the part that comes from the action to the keyboard but I can't figure out what goes from there to the pedal. ...

•We have an English Weber 6'1" grand pedal-electric Duo-Art, circa 1924-1927, from which several parts have been removed at some long-ago time. One part in particular is the linkage between the accordions and the expression box. If anyone, especially our UK friends, has one of these pianos and would...

•Hello All! It has been about 10 years since my last submission to the MMDigest. Normally I'm an avid reader but this time I need some help in finding a missing part. I was recently given a wonderful little gem of a Recordo grand by a very dear close friend of mine. It's a Schaff Brothers 4'8" Simpl...

•Hi All, I don't know whether the correct terminology for these parts is 'screw' or 'bolt' because they are actually metal screws. I'm speaking, of course, of those small screws that hold together the various pieces of metal linkage in the Duo-Art system. There's a rebuilder in Canada who needs twen...

•I think the screws for linkages in the Duo-Art piano may be known as 'shoulder screws'. These are very common in old players and in many nickelodeon players such as the Wurlitzer roll changer. These screws are easily available or you can make your own with drill rod stock and a lathe. I prefer to b...

•Does anyone have Aeolian Orchestrelle linkages left over from a restoration project? Obviously this would have happened if you had to combine two non-working Orchestrelles into one working machine. The pieces I am looking for are the all-wood links and the wooden-plus- metal-rod ones. I might need ...

•Hello MMD, I am finishing up restoration of a Steinway "OR" reproducing grand piano for a client in Maine. I am in need of the small bellows and associated linkage that provides the hammer rail lift. This small bellows usually lives behind the spool box, and receives its suction from the Theme prim...

•My 1919 Franklin Ampico has been missing the "roll adjusting rod" since I bought it in 1975. This is the basic Amphion upper guts that Ampico used in their uprights. This piano has been rigged to shift the tracking bar from the roll adjusting pneumatic instead of shifting the piano roll. After havi...

•[ Jamie Brewer wrote in 160421 MMDigest: > This piano has been rigged to shift the tracking bar from the > roll adjusting pneumatic instead of shifting the piano roll. Personally I would leave it as is, shifting the tracker bar instead of shifting the paper -- much safer for old rolls. The late Duo...

•A big "Thank you" to all for the help I got from the board. I was able to acquire the needed tracking parts and got the installation finished up this morning. I just wrote it up in my "public blog" if anyone cares to read about it. http://jamiebrewer-brick1101.blogspot.com/2016/04/piano-tracking-re...

•I'd appreciate hearing some opinions regarding what's the best lubricant for the pump linkages in a Standard brand player system. I've drilled out the "wallowed out" holes in the linkage setup where the parts rotated on the pins, and press-fitted bronze bushings where they were (1/4" long x 1/4" I...

•Over a year ago, I bought a wall-mounted Symphonion Clock at auction. I have attached pictures and it stands about four feet tall. The clock mechanism is being serviced at the moment and the Symphonion plays well but needs a good clean. However, I have no idea how the clock was linked to the Sympho...

•Beginning on page 216, Q. David Bowers' "Encyclopedia of Automatic Musical Instruments" pictures and describes several models of Symphonion's musical clocks, and they all mention that the musical disc part of the clock can be set to play after the clock strikes, according to the owner's wishes, and...

•Hmmm. I wonder if the clock movement is the original one. I say this because of the strike hammer, which is waiting to hit a gong that's not there and doesn't look like it ever was there to begin with. I know nothing about these clocks. Was the music box supposed to start at certain hours, or on th...

•If this is anything like my clock, you will find that the strike has been modified from a 2-hammer "bim-bam" strike, to a single hammer, with a lever (the "bam" hammer) that is operated after the last gong. That lever pulls a string that activates the start lever of the music box. Marc Kaufman ...