What can I make to keep track of time without electricity

Click For Summary

Discussion Overview

The discussion centers around creating a timekeeping device that operates without electricity, using materials that can be sourced from local department stores. Participants explore various concepts, including traditional timekeeping methods and mechanical designs, while emphasizing the need for precision in measurement.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest using a sun clock, Roman water clock, sand clock, or Foucault's pendulum as potential designs.
  • Concerns are raised about the accuracy of these designs, with a need for measurement to the nearest half second or tenth second mentioned.
  • One participant proposes a traditional watch that can be wound up, while another suggests a wall clock for half-second accuracy.
  • There is a discussion about the feasibility of using an oscillating spring or Newton's cradle, with questions about compensating for friction.
  • A participant suggests that a pendulum could work if it has low friction, but questions arise about how to mechanically count swings and achieve the desired precision.
  • Dripping water from a reservoir is proposed as a method for timing, with ideas for marking the timing on a ribbon of paper.
  • Some participants discuss the challenges of building a mechanical clock from scratch, noting the skills and tools required for high precision.
  • A water clock is mentioned as a possibility, with considerations for evaporation and maintaining a steady water level.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and accuracy of various timekeeping methods. There is no consensus on a specific design that meets all criteria for precision and handmade construction.

Contextual Notes

Participants highlight limitations in achieving the desired precision with available materials and skills, as well as the challenges of mechanical counting and energy compensation in non-electronic designs.

Who May Find This Useful

This discussion may be of interest to hobbyists, educators, and individuals exploring DIY projects related to timekeeping and mechanical design.

  • #31
sophiecentaur said:
Why not go back and ask 'them' to set realistic targets for this project or call their bluff and ask how 'they' would do it.
Agreed. I'll be more direct: Michael, what is the purpose of this project? Why are you undertaking it? Knowing that might help people understand your constraints and be able to provide more/better assistance.
 
Physics news on Phys.org
  • #32
I just want to make something like a stopwatch that can accurately measure time within a certain interval of time
 
  • #33
Would this work?
 
  • #34
Michael2525 said:
I just want to make something like a stopwatch that can accurately measure time within a certain interval of time
Thanks. "Certain interval"? Is your "accuracy" constraint based on something or just randomly selected? And do you need precision or accuracy or both?
 
  • #35
Michael2525 said:
Would this work?

That's just an odd and mediocre pendulum. I don't think it would be useful for this project.
 
  • #36
russ_watters said:
Thanks. "Certain interval"? Is your "accuracy" constraint based on something or just randomly selected? And do you need precision or accuracy or both?
What is the difference between accuracy and precision? I just need something that can tell the duration of time like a stopwatch does. It doesn't need to last hours, just a few minutes.
 
  • #37
Michael2525 said:
What is the difference between accuracy and precision? I just need something that can tell the duration of time like a stopwatch does. It doesn't need to last hours, just a few minutes.
Accuracy-and-precision-picture.png

Given that it doesn't need to last very long, that means it doesn't need to be very accurate only very precise.

Are there any other constraints we should know about? Also, the reason I asked where the constraints came from is that if we determine you can't have the precision you desire, you may decide to still do the project with less precision or not. If the constraints are not that important, you might get more people to help you who would otherwise avoid what they think is an impossible project. Also, explaining the purpose might convince people to help you who might otherwise consider this a pointless project.
 
  • Like
Likes   Reactions: Merlin3189
  • #38
Michael2525 said:
What is the difference between accuracy and precision?

Google knows these kinds of things.

Michael2525 said:
I just need something that can tell the duration of time like a stopwatch does.

Why not simply buy a http://www.bodytronics.com/p/two.html?gclid=CKba6NLDxsoCFRCNaQodw5UPPw?
 
  • #39
russ_watters said:
Accuracy-and-precision-picture.png

Given that it doesn't need to last very long, that means it doesn't need to be very accurate only very precise.

Are there any other constraints we should know about?
Thanks for the pic.
Other than it cannot use electricity there isn't much constraints. Of coarse it has to be something I can make. (Preferably something out of wood or something I can buy at a local department store.)
 
  • #40
spamanon said:
Google knows these kinds of things.
Why not simply buy a http://www.bodytronics.com/p/two.html?gclid=CKba6NLDxsoCFRCNaQodw5UPPw?
It's for a project I am working on.
 
  • #41
Michael2525 said:
Other than it cannot use electricity there isn't much constraints. Of coarse it has to be something I can make. (Preferably something out of wood or something I can buy at a local department store.)
Please see my additional questions I added after you responded. It would be helpful if you answered them. You might get more/more useful responses if we understood the point of this better.
 
  • #42
russ_watters said:
Please see my additional questions I added after you responded. It would be helpful if you answered them. You might get more/more useful responses if we understood the point of this better.
So basically what I am trying to build is a device that can precisely measure a duration (perhaps 95 seconds) like a stopwatch.
 
  • #43
Michael2525 said:
So basically what I am trying to build is a device that can precisely measure a duration (perhaps 95 seconds) like a stopwatch.
We know what. I asked why: why are you undertaking this? Why do you have these constraints (where did they come from?)?
 
  • #44
It's just a challenge I wanted to undertake, and I like building stuff.
 
  • #45
Great! In that case, all of the constraints are negotiable, which means people don't have to follow them if they think they are unrealistic. So you'll have better odds of making something that works instead of not being able to make anything at all.
 
  • Like
Likes   Reactions: davenn
  • #46
Michael2525 said:
Would this work?

The rolling ball and the collisions at each end of the track would involve significant loss of energy. Throw away the ball and the pendulum will go for much longer and with a better defined oscillation period.
 
  • #47
Michael2525 said:
It's just a challenge I wanted to undertake, and I like building stuff.
If you were to read around about ancient timekeeping methods then you could go back far enough and find something appropriate to build. It will demonstrate to you just how useful Electricity can be because an electrical solution is much more achievable for the hobbyist than regular clock making. An electromagnetic / optical system for maintaining a well made pendulum would give you a good chance of achieving your original spec. Your advantage is that this thing doesn't have to work on a small ship, rolling about in an Atlantic gale!
 
  • Like
Likes   Reactions: russ_watters
  • #48
Michael2525 said:
It's just a challenge I wanted to undertake, and I like building stuff.

It is time for you to stop being so mysterious. If you want our help, tell about your project and the origin of these constraints.
 
  • #49
For various reasons, this thread is closed.
 

Similar threads

  • · Replies 20 ·
Replies
20
Views
2K
  • · Replies 100 ·
4
Replies
100
Views
11K
  • · Replies 3 ·
Replies
3
Views
6K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 16 ·
Replies
16
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 58 ·
2
Replies
58
Views
6K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 12 ·
Replies
12
Views
4K