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  • Compensated pendulums - NAWCC Forums
    Mercury compensating pendulums contain one or more glass or metal flasks partially-filled with mercury as counterweight When the mercury expands, it moves up inside the flask(s), counteracting the lengthening of the iron pendulum rod I believe such pendulums were designed to be used in true regulator clocks
  • Meaning of RA on German pendulums - NAWCC Forums
    French "retarder" meaning to delay or hold back "Avancer" to bring or move forward Usually indicated on pendulums as "R A" and on watch regulators as "R A" or "Retard" "Avance" The French terminology was used throughout Continental Europe
  • ALL ABOUT PENDULUMS - NAWCC Forums
    Clock pendulums usually have a rating nut attached to the bottom of the stick, for raising and lowering the bob, and so raising and lowering the center of gravity Raising it makes the clock run faster Lowering it makes the clock run slower [RATING NUT] View attachment 183652
  • Pendulum for Howard Miller Clock - NAWCC Forums
    use Most battery pendulums are not intended to be adjustable and it would seem this needs a real pendulum Measure the length to get the bob in the window Measure how long that is and get a pendulum that is about an inch longer to work with A wood rod would look best in this clock and be easier to shorten as may be needed Tinker Dwight
  • Two interesting pendulums - NAWCC Forums
    Bear in mind Ming that when temperature compensating pendulums were produced very few homes had central heating Inside temperature would fluctuate considerably from season to season These days we are probably unlikely to see temperature variations of much more than 10 degrees Celsius throughout the year
  • Pendulum Identification - NAWCC Forums
    These outstanding pendulums and bob assemblies were likely patented and protected from copying However, the more mundane and ordinary bobs and pendulum decorations were likely made by a clock parts manufacturer as stock parts to many and any clock manufacturer for their moderately priced and most popular clocks
  • pendulum weight - NAWCC Forums
    The repair guide doesn't list actual weights of pendulums unfortunately For all my clocks, my spreadsheet lists a as-received weight of the pendulum for a reference In most case, the weights are about the same for the style of clock say Kundo full size, or Schatz 49
  • Safety of Mercury in Pendulums - NAWCC Forums
    I have two regulators with mercury pendulums and this is what I have done From the rear of the brass caps I drilled a hole and tapped it with 6-32 thread,then with gasket material from an auto parts supplier I made gaskets to fit the inside of the caps,push the caps down on the jars and use a set screw to secure them to the rod that the caps
  • Weight driven clocks: is there a formula for the drive weight vs. the . . .
    Very general question I know Let's assume anchor recoil escapement I have a few old tallcase and wall clock movements that are missing pendulums I assume the drive weight should be a bit heavier than the pendulum bob weight The longer the pendulum, probably the heavier the drive weight needs
  • Runs a tiny bit fast. . . bob is as low on the pendulum as possible.
    This is true for Lyre pendulums - and perhaps some others I am currently experimenting with a lyre pendulum for a "94 cm" Urgos movement While the lyre assembly is about 34 inches long, the center of gravity according to a balance method is about 3 inches above the bob So adding weight to the top of the bob will slow it down some





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