E. Howard Marine Clock approx. 1870

[pocketsrforwatches]

Working on what I believe is a #69 E. Howard marine clock dating to approx. 1870. I normally work on pocket watches and don't do much clock work, but this is a time only with a platform escapement running at 16,200. After COA including removal and cleaning of mainspring I have what I consider poor amplitude at around 145 degrees. The mainspring is pretty big in this clock but I didn't measure it when I had it out. (Dumb!) The clock is running pretty well even at 145 degrees amplitude. Questions are, what should I expect amplitude to be for this clock and should I try to source another mainspring?

Thanks,
Roger

 

[shutterbug]

I guess the biggest factor is "does it keep time?". Usually, if the amplitude is too small, the clock will gain time.