- Feb 28, 2009
This looks like plate 1411 with no signature. The suspension unit is a Kern standard. Anyone know what this is?
Good looking clock - the Roman numerals are especially nice. Now if you'd payed 10x what it was worth...I just paid 4 times what it's worth and can't afford it, but I couldn't help myself. I think you're right, 1667.
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How do I account for that?
The pendulums for the Schatz 49s are heavy suckers but keep in mind, as Galileo showed, that the period is not related to the mass of the pendulum, but to its length. The ideal mass of the pendulum would be that which would guarantee the escapement would continue to trip for the maximum duration of the winding (in this case ~400 days) and no more.I just took my Schatz standard down for some cleaning, pendulum weighs 12.65. Those other two are for mini's.
The pendulums for the Schatz 49s are heavy suckers but keep in mind, as Galileo showed, that the period is not related to the mass of the pendulum, but to its length
Interesting. Can you point me at a reference that shows the dependence of the period on the mass?Think Galileo was referring to swinging pendulums. Torsion pendulums are affected by mass and spring rate.
Interesting. Can you point me at a reference that shows the dependence of the period on the mass?
I'd expect no change. The amplitude of the rotation would change but not the period.Well maybe later I'll look. For now what do you think will happen to a torsion pendulums period if you remove a couple weights reducing its rotating mass?
I wonder what the relative center of mass of the two pendulums is. For example, the regulator nut changes the period of a pendulum by moving its center of mass, not its mass. I wonder what the effect of removing two opposite weights from a four-weight pendulum would be. The center of mass would remain the same but the weight would be decreased by a significant amount.I took a suspension unit off a Schatz clock. I hung the top block and put on the Schatz pendulum. It weighs 12.6 oz and I got 8 beats in 60.52 seconds. I found a miniature pendulum, probably a Herr, and it weighs 6.7 oz and I measured 8 beats in 31.07 seconds.
I wonder what the effect of removing two opposite weights from a four-weight pendulum would be.
Schatz weights swapped out for lighter weights. Frankenstein.
SO I now have two of these clocks. My old book did not have plate 1667. But that's what they are. According to Appendix 81 in the book, the 1954 version of this plate have an escapement guard and a pendulum locking bracket. Neither of these two have those additions. When I got these clocks, they just struck me as old. So am I to assume these clocks were made "sometime" between 1932 and 1954? Is there anyway I can narrow that down? Now I just need to fine a Kern pendulum for Kern #1 and get that Schatz pendulum off it. It's a good timekeeper, but that Schatz pendulum needs to be on a Schatz!Maybe plate 1667? What does the rest of the clock look like?