Positive Earth, had an advantage the the car body did not corrode as fast (its not the reason for that way around) but all the switches contacts corroded, including the contactor points, the reason I believe cars swapped over to Neg earth was the radios worked better we are talking 1950/60s, NOW todays cars all use solid state switching and we are back to switching the negative line although the car body is still negative.
iirc, the DR going to 'exchange equipment' would be to to with call charging, which makes sense because you wouldn't want an exttra hour of call charge when you manually advance the clock
You should get a clock card machine. These were used to record working hours of employees by printing the time on a paper card. These machines were controlled by a master clock too.
@@LOOKMUMNOCOMPUTER it would be hilarious to find one and get "timecards" museum guests could punch in and out on as a memento of their time in the museum.
We used to have those at the cable factory I worked at. We had to punch in and out. There used to be a big queue at the clock before we left because no one was allowed to clock out even a second early. You would be invited for a talk with the boss LOL
Im here for the clocks, not a manicure. I dont think I would even notice unless you asked me round for tea and crumpets. 🤣 BTW nice clock 🤣 Thanks for the update 👍👍
The reason why the earth is positive is to reduce the effect of electrolysis stripping the copper out of the wires in the ground when they got wet. Despite the convention that current flows from positive to negative, electrons actually flow from the negative to positive.
If you get chance visit the Great Central Railway (north) in Ruddington they have a full masterclcok setup driving the clocks in that building which is regularly maintained by the Royal Horological Institute
How did I not know you had a 2nd channel here. I've been nerding out over clocks for a couple months now (just posted a video on PTP). Would've loved to see this video _before_ mine, but ah well! Fascinating to see the old mechanical ways :)
Just set up an NTP server for my LAN (maybe my next box will support PTP, who knows), now I'm itching to set up a master clock backed NTP server, wonder how drifty it's be
Sam don't put yourself down, You're far from being an idiot! - Keep up the good work! - And thank you for sharing, I wish i was fit enough to travel so i could get to the museum and see all of your creations in person!
Reminds me of sitting in classes in school and sometimes when the class was almost over the clock’s minute arm would tick backwards once or twice and while no one said anything you could feel the psychic energy of the whole class go “C’mon man, WTH!?!” This explains it 🤣
ayy you know new sandals lol. Incidentally I just finished a tandem asterisk to connect both of our exchanges together works pretty well, there is a line for each direction. also depending on the amount of clock you have on each circuit you need to balance it with resistors, more clocks less resistors and less clocks, more resistors. this is so the current is regulated to each clock solenoid stopping them from burning out when there aren't many clocks
I am envious of the master clock, they are very expensive to buy. I picked a couple of lovely TR slave clocks from a reclamation yard some years ago. I built a (very simple) module to drive them from the NPL radio time signal. Had some mechanical problems with the slave clocks, they need a bit of a tune up. Planning to make a vid about getting all that going again now I am inspired by this one! Cheers!
Thanks for posting this information. I have a NTR master clock and two NTR slave programmable clocks and can't figure out how to wire them properly so your video should give me some clues. Will need to watch it a few times to understand it all though.
Cool! Tbh you could get away with just using a 5000 ohm relay to drive it! You Might be able to fashion something together if you can’t find a GMT34 relay set
@@LOOKMUMNOCOMPUTER Yes, I'll get there eventually. One of my clocks requires a +24v-24v pulse to advance the geared di-pole motor for a 1-minute step. I'm a mechanical engineer so electrics is alien to me.
Nice video. It was funny to see the minute hand advancing that quickly. when you toggled that switch. Could you please explain as well how these slave clocks work?
The pulses from the master clock fires an internal solenoid within the slave clock(s) which in turn turns the clock's fingers when pulsed (in many cases, though certainly not all, the slave clocks only advance 'minute by minute' with each pulse as opposed to second by second like a normal electric or a wind up clock would) Hope this answers your question?
@@andyblackpool Thanks for your reply, Andy. So that means that you only from the master clock, you can only make the slave clocks advance at the same pace, not that they actually display the same time. It seams cumbersome to me to service a system like that, specially when the clocks are far away from each other. Do all central clock systems work in a similar way?
@@thomasamsterdam Cumbersome judging by todays clocks yes but these things are ancient and used well before solid state and electronic mechanisms were invented! Imagine for instance a large railway station dozens of clocks on say 25 platforms, several waiting rooms, offices and despatch yards run precisely in tandem; none of them ever needed winding or adjusting. That was the rationale behind master and slave clocks all of them told the exact same time as each other and they all moved on one minute forward at precisely the same time as each other too.
Interesting (and more compleex than I expected!) One suggestion, when you add text comments to the video, keep them on screen a little longer, by the time I see them they have vanished (may be my old worn out eyballs not running fast enough!)
If you had a timeclock measuring the working hours of the day, but wanted to adjust the clock time because of daylight savings time, you might want to advance the clocks without advancing the timeclock an hour as well. (advancing the timeclock would mean paying your workers an extra hour; can't have that!) So perhaps that's the reason for the separate 30 second timers. One for time and one for anything measuring duration.
This matches what I was told when I went on a tour of a place that (used to) have a master clock. It was for measuring/metering out duration of things, time cards, phone bills, or the place I toured the scientific and chemistry equipment wanted to do "every X hours..." or mark/progress a paper scroll analog cylinder thing with the next measurement every "tick"
I have a Swedish master clock made by Westerstrand with a nice L.M. ericson logo on. But I’m missing a pendulum and pendulum spring. I have not been able to source either. Perhaps someone knows where to find suitable parts?
The most electrically synchronised clocks I’ve seen in one place in at theclockworks.org (in south London) who also have a library of all things clocks.
The main issue with a positive earth electrical system in a car is that an electric fuel gauge sending unit is dodgy. That wasn't a big deal before 1961, when most cars had a 6 Volt battery and did not have a fuel gauge. After 1961, that all changed, at least in North America.
First! Sup Sam! Got motivated by you to hack my Casio Privia PX-120 =P Building a midi controller / modular synth from scratch using just the key matrix
The negative polarity is for corrosion reduction - the leakage to earth that would occur if insulation were damaged opposes the corrosion. The relatively high 48V leads to lower current and minimizes resistance loss over long haul cables.
This capitule is extra (not) obsolete. An arduino does that 16000000 times per second. Imagine if you use this tech. It would take half a year to run the equivalent of 1 second
Positive Earth, had an advantage the the car body did not corrode as fast (its not the reason for that way around) but all the switches contacts corroded, including the contactor points, the reason I believe cars swapped over to Neg earth was the radios worked better we are talking 1950/60s, NOW todays cars all use solid state switching and we are back to switching the negative line although the car body is still negative.
"Unless you've got a wall of 80 clocks..." Well, we know what the next museum exhibit is going to be now.
iirc, the DR going to 'exchange equipment' would be to to with call charging, which makes sense because you wouldn't want an exttra hour of call charge when you manually advance the clock
Yes that makes sense! I have the relay sets for that but haven’t wired them in yet. Makes sense
You should get a clock card machine. These were used to record working hours of employees by printing the time on a paper card. These machines were controlled by a master clock too.
I’m yet to find one that is electromechanical! Rest assured if I find one! I certainly will try to get hold of it if it’s reasonable. Cheers
@@LOOKMUMNOCOMPUTER it would be hilarious to find one and get "timecards" museum guests could punch in and out on as a memento of their time in the museum.
@@LOOKMUMNOCOMPUTER I’ve got one I could send over. Where can I send the information?
@@FloydBunsen it would certainly be of interest! There’s a contact form on thismuseumosnotobsolete.com :)
We used to have those at the cable factory I worked at. We had to punch in and out. There used to be a big queue at the clock before we left because no one was allowed to clock out even a second early. You would be invited for a talk with the boss LOL
Im here for the clocks, not a manicure. I dont think I would even notice unless you asked me round for tea and crumpets. 🤣
BTW nice clock 🤣
Thanks for the update 👍👍
The reason why the earth is positive is to reduce the effect of electrolysis stripping the copper out of the wires in the ground when they got wet.
Despite the convention that current flows from positive to negative, electrons actually flow from the negative to positive.
This is right up my street, so many little tiny projects put together for one big one.
If you get chance visit the Great Central Railway (north) in Ruddington they have a full masterclcok setup driving the clocks in that building which is regularly maintained by the Royal Horological Institute
How did I not know you had a 2nd channel here. I've been nerding out over clocks for a couple months now (just posted a video on PTP). Would've loved to see this video _before_ mine, but ah well! Fascinating to see the old mechanical ways :)
Just set up an NTP server for my LAN (maybe my next box will support PTP, who knows), now I'm itching to set up a master clock backed NTP server, wonder how drifty it's be
Sam don't put yourself down, You're far from being an idiot! - Keep up the good work! - And thank you for sharing, I wish i was fit enough to travel so i could get to the museum and see all of your creations in person!
Reminds me of sitting in classes in school and sometimes when the class was almost over the clock’s minute arm would tick backwards once or twice and while no one said anything you could feel the psychic energy of the whole class go “C’mon man, WTH!?!” This explains it 🤣
Like Joel in "Risky Business".
Hope i'll be able to visit the museum someday, i love tinkering with old tech myself and this place looks like a dream
ayy you know new sandals lol. Incidentally I just finished a tandem asterisk to connect both of our exchanges together works pretty well, there is a line for each direction. also depending on the amount of clock you have on each circuit you need to balance it with resistors, more clocks less resistors and less clocks, more resistors. this is so the current is regulated to each clock solenoid stopping them from burning out when there aren't many clocks
I am envious of the master clock, they are very expensive to buy. I picked a couple of lovely TR slave clocks from a reclamation yard some years ago. I built a (very simple) module to drive them from the NPL radio time signal. Had some mechanical problems with the slave clocks, they need a bit of a tune up. Planning to make a vid about getting all that going again now I am inspired by this one! Cheers!
Thanks for posting this information. I have a NTR master clock and two NTR slave programmable clocks and can't figure out how to wire them properly so your video should give me some clues. Will need to watch it a few times to understand it all though.
Cool! Tbh you could get away with just using a 5000 ohm relay to drive it! You
Might be able to fashion something together if you can’t find a GMT34 relay set
@@LOOKMUMNOCOMPUTER Yes, I'll get there eventually. One of my clocks requires a +24v-24v pulse to advance the geared di-pole motor for a 1-minute step. I'm a mechanical engineer so electrics is alien to me.
Fascinating stuff this. Thx.
Love your enthusiasm pal, Keep it going!
Nice video. It was funny to see the minute hand advancing that quickly. when you toggled that switch. Could you please explain as well how these slave clocks work?
The pulses from the master clock fires an internal solenoid within the slave clock(s) which in turn turns the clock's fingers when pulsed (in many cases, though certainly not all, the slave clocks only advance 'minute by minute' with each pulse as opposed to second by second like a normal electric or a wind up clock would) Hope this answers your question?
@@andyblackpool Thanks for your reply, Andy. So that means that you only from the master clock, you can only make the slave clocks advance at the same pace, not that they actually display the same time. It seams cumbersome to me to service a system like that, specially when the clocks are far away from each other.
Do all central clock systems work in a similar way?
@@thomasamsterdam Cumbersome judging by todays clocks yes but these things are ancient and used well before solid state and electronic mechanisms were invented! Imagine for instance a large railway station dozens of clocks on say 25 platforms, several waiting rooms, offices and despatch yards run precisely in tandem; none of them ever needed winding or adjusting. That was the rationale behind master and slave clocks all of them told the exact same time as each other and they all moved on one minute forward at precisely the same time as each other too.
The worst part of these videos is that I'm many thousands of miles away from seeing it in person.
I’ll have to wire mine up now!
Interesting (and more compleex than I expected!) One suggestion, when you add text comments to the video, keep them on screen a little longer, by the time I see them they have vanished (may be my old worn out eyballs not running fast enough!)
If you had a timeclock measuring the working hours of the day, but wanted to adjust the clock time because of daylight savings time, you might want to advance the clocks without advancing the timeclock an hour as well. (advancing the timeclock would mean paying your workers an extra hour; can't have that!)
So perhaps that's the reason for the separate 30 second timers. One for time and one for anything measuring duration.
This matches what I was told when I went on a tour of a place that (used to) have a master clock. It was for measuring/metering out duration of things, time cards, phone bills, or the place I toured the scientific and chemistry equipment wanted to do "every X hours..." or mark/progress a paper scroll analog cylinder thing with the next measurement every "tick"
1:13 we call that Kosmo Time
I have a Swedish master clock made by Westerstrand with a nice L.M. ericson logo on. But I’m missing a pendulum and pendulum spring. I have not been able to source either. Perhaps someone knows where to find suitable parts?
Damn cool timekeeping tech again. Makes you on par with Emmett. Where do you get it all? :)
The most electrically synchronised clocks I’ve seen in one place in at theclockworks.org (in south London) who also have a library of all things clocks.
Nice to see some so into things which make no sense at all - I love it, exactly like me with my museum and youtube channel Flipperstein Schmatz...
The main issue with a positive earth electrical system in a car is that an electric fuel gauge sending unit is dodgy. That wasn't a big deal before 1961, when most cars had a 6 Volt battery and did not have a fuel gauge. After 1961, that all changed, at least in North America.
i never heard about this Technology, but i have to say that i love these klickedi klickedi klaks klaks
It’s wired positive earth to help reduce corrosion in metals.
Could you use these units to work a sequencer :)
Check the vid on my main channel in October I did it :)
I love learning shit
First! Sup Sam! Got motivated by you to hack my Casio Privia PX-120 =P Building a midi controller / modular synth from scratch using just the key matrix
Awesome news!
set up an NTP server running off of it? 😁
"Earth is actually positive voltage"
Yup.
That's like a Calligraphy compared to my handwriting.........
the phone systems have always been -48 volts... there must be a reason!
The negative polarity is for corrosion reduction - the leakage to earth that would occur if insulation were damaged opposes the corrosion.
The relatively high 48V leads to lower current and minimizes resistance loss over long haul cables.
This capitule is extra (not) obsolete. An arduino does that 16000000 times per second. Imagine if you use this tech. It would take half a year to run the equivalent of 1 second
well yeah but that aint the point
All that wiring and mechanical malarkey, and the museum STILL can't make a decent batch of fish-n-chips.
Plural of tooth is teeth.
Not tooths 🤔😊✌️✌️