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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
  • 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 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
  • 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
  • Lyre -vs- Wood Stick Pendulum. - NAWCC Forums
    The reason I tell you this is I don't want you to think that you can simply find a balance point, then measure to the suspension and know effective pendulum length For many pendulums, the difference between the center of gravity and center of oscillation is small so what you are doing is a good first approximation
  • 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
  • Newbie Question: Why typically 4-ball pendulum? | NAWCC Forums
    Others used ball pendulums (2-ball, three-ball) from the mid-1880's up to 1909 when the first fully adjustable 4-ball pendulum was patented by August Schatz Their patent rights extended into WW1 so they had almost exclusive use of this design to the end of 1915, but after that every maker started using 4-ball pendulums of various configurations
  • 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





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