Re: [time-nuts] Antique precision timing device without electronics

In message <20170317220437.4a4ff406...@ip-64-139-1-69.sjc.megapath.net>, Hal Murray writes: > >e...@scace.org said: >>Frequencies around 15 Hz were common on early 20th century cables, >> depending on the degree of success in compensating for the inherent >> capacitance on a cable

Re: [time-nuts] Antique precision timing device without electronics

Don't forget, seawater is the return path... > On Mar 17, 2017, at 18:04, Hal Murray wrote: > > > e...@scace.org said: >> Frequencies around 15 Hz were common on early 20th century cables, >> depending on the degree of success in compensating for the inherent >>

Re: [time-nuts] Antique precision timing device without electronics

e...@scace.org said: >Frequencies around 15 Hz were common on early 20th century cables, > depending on the degree of success in compensating for the inherent > capacitance on a cable thousands of miles long surrounded by conductive > sea water. Is the sea water relevant? Does enough energy

Re: [time-nuts] Antique precision timing device without, > electronics

...@febo.com wrote: Message: 8 Date: Fri, 17 Mar 2017 01:34:39 +0100 (CET) From: "iov...@inwind.it" <iov...@inwind.it> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Antique precision timing device without

Re: [time-nuts] Antique precision timing device without, > electronics

In message <338b9eed-8664-3876-afdf-610abc420...@irtelemetrics.com>, Dan Kemppainen writes: >What the lowest frequency tuning fork oscillator ever built? Was 1Hz >ever achieved commercially? Does flagpoles count ? :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20

Re: [time-nuts] Antique precision timing device without, > electronics

, time-nuts-requ...@febo.com wrote: Message: 8 Date: Fri, 17 Mar 2017 01:34:39 +0100 (CET) From: "iov...@inwind.it" <iov...@inwind.it> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Antique precision

Re: [time-nuts] Antique precision timing device without electronics

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,

Re: [time-nuts] Antique precision timing device without electronics

In message , Eric Scace writes: > Frequencies around 15 Hz were common on early 20th century cables, >depending on the degree of success in compensating for the inherent >capacitance on a cable thousands of miles long surrounded by

Re: [time-nuts] Antique precision timing device without electronics

rch 16, 2017 4:23 AM > To: time-nuts@febo.com > Subject: [time-nuts] Antique precision timing device without electronics > > Hi all, > > I was recently asked to resurrect this interesting device by a colleague > who collects antique scientific instruments. It's a "Chrono

Re: [time-nuts] Antique precision timing device without electronics

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. --

Re: [time-nuts] Antique precision timing device without electronics

On British submarine telegraph cable systems, repeater stations and receiving sites employed tuning forks. Repeater sites were at cable traffic junctions or islands; e.g., Ascension and St Helena Islands in the Atlantic, Cocos Keeling in the Indian Ocean, Norfolk Island (junction) and

Re: [time-nuts] Antique precision timing device without electronics

Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bill Hawkins Sent: Thursday, March 16, 2017 1:05 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Antique precision timing device without electronics Hi Morris, If there's no active

Re: [time-nuts] Antique precision timing device without electronics

Mike Seguin" <n1...@burlingtontelecom.net> >Data: 16/03/2017 22.33 >A: "Discussion of precise time and frequency measurement"<time-nuts@febo.com> >Ogg: Re: [time-nuts] Antique precision timing device without electronics > >Very interesting use of a tuni

Re: [time-nuts] Antique precision timing device without electronics

I think Bob Pease of National Semiconductor fame mentioned looking for the earliest use of phase locked loops and finding a reference to a European clock maker who had a master pendulum clock with a mechanical coupling that phase locked newly built clocks when left connected overnight. On Thu, 16

Re: [time-nuts] Antique precision timing device without electronics

-Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Morris Odell Sent: Thursday, March 16, 2017 4:23 AM To: time-nuts@febo.com Subject: [time-nuts] Antique precision timing device without electronics Hi all, I was recently asked to resurrect this interesting device

[time-nuts] Antique precision timing device without electronics

Very cool! Thanks for sharing. You could probably use any of the large vintage neon bulbs to replace the missing lamp. Cheers, Corby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Antique precision timing device without electronics

For the bulb you can probably replace it with a W1A or AR-1bulb which is an argon bulb commonly used in old school contact printers they have a purple hue and also emit long wave UV light I doubt if they are still manufactured but a photo shop or studio or chemist shop which developed film

Re: [time-nuts] Antique precision timing device without electronics

for setting the weights at the end of the fork tines? Best regards, Bill Hawkins -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Morris Odell Sent: Thursday, March 16, 2017 4:23 AM To: time-nuts@febo.com Subject: [time-nuts] Antique precision timing

[time-nuts] Antique precision timing device without electronics

Hi all, I was recently asked to resurrect this interesting device by a colleague who collects antique scientific instruments. It’s a "Chronoscope" made by the H. Tinsley company in London in the early 20th century and used to measure time intervals with the precision of those days. It's large