My great, great uncle, longtime design engineer for Guglielmo Marconi had a tuning fork arrangement of the type discussed here that was enclosed in an evacuated glass cylinder. I have no idea for what purpose it was used or what happened to it when he died. On Friday, March 17, 2017, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > -------- > In message <160EF818076B4D03A0C067ED273D980B@system072>, "Bill Hawkins" > writes: > > >Conservation of power says some must be taken from the fork to operate > >the contacts. > > Electromagnetic induction could give plenty energy for that, given the > size and heft of the tuning fork. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com <javascript:;> > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- William H Fite, PhD Independent Consultant Statistical Analysis & Research Methods