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

Hi Morris: The GR 631 StroboTac includes a power line driven vibrating reed sticking into the reflector and so it's motion is stopped by the strobe. The patent has hand written comments regarding that idea. http://www.prc68.com/I/GRstrobotac.html#2331317

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

Hi > On Mar 17, 2017, at 7:41 PM, Morris Odell wrote: > > HI all, > > Thanks to all those who responded to my post and also for the great pics of > other tuning forks. It's amazing that they were still being used for > electronic purposes as recently as the 1960s.

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

HI all, Thanks to all those who responded to my post and also for the great pics of other tuning forks. It's amazing that they were still being used for electronic purposes as recently as the 1960s. Actually now that I think about it I have seen little tuning forks used to check the function of

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