Home Made Speaker Experiment

Here is an easy way to demonstrate how sound is reproduced electronically.

This is how this simple speaker works:

(Note that on most speakers the magnet is stationary and the coil is attached to a moving cone.)

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How an elevator affects magnetometer trace

I made this video to show how an elevator affects the magnetometer trace. This is something, for those using a magnetometer to detect earthquake precurors, to be aware of. Notice the characteristic of the trace. Not to be mistaken as an earthquake precursor.

(Editor’s note: Simon is using the magnetometer described in this post. He lives on the 7th floor and sees very little traffic noise on his daily recordings, but at certain times of day he had been plagued by some very regular signals, always about the same size. In this video he shows how he finally tracked down where they’re coming from.)

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Summer 2011

Several classes were run this summer. Once again we found it very difficult to get the students to go home at the end of the two and a half hour course periods. It seems they just can’t get enough of this! Here is a summary of their activities:

Most of the projects, such as the crane required some woodwork so a lot of sawdust was flying around in the beginning.

The 4 wheel drive car continues to be a popular project and several were made this summer.

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Student Seismology Research Station – Seismometer and Magnetometer Recording Via Computer Sound Card

(Seismology = the study of earthquakes
Seismometer = device for measuring earthquakes
Magnetometer = device for measuring magnetic fields)

One cannot ordinarily record earthquakes via a computer sound card as they don’t respond much to the slow vibrations experienced in earthquakes. (Update: not strictly true. See my latest on this: Simplest Seismometer – Experiments with direct recording through PC sound card) However, with some cheap electronic trickery and clever software, it can be done, and very adequately for the purposes of study. The seismometer above, made by a high school student, in its first night of testing recorded this local 3.8 quake – a magnitude 1 in Taipei:

(click on the pictures for larger versions)

and as a surprise bonus, some filtering of background noise revealed this distant quake as well. It was a 5.9 from 1000 km away in the Philippines.

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Making animated GIF pictures

(Graphics Interchange Format, “GIF” is a computer image format that has become popular on the internet.)

It’s not very difficult to get children interested in computers. (What an understatement.) And if one hopes that their interest can be channeled into something useful, this is a fun way to start. Animated GIFs are a great way to create interesting web pages, blogs email attachments etc., and the ability to create them will be a useful skill in any future internet-related career.  It’s not hard to learn how to make them. I’m describing here how I have made them on the Linux operating system. I use it for two main reasons:

1) It is all freely available software, so one will not be tempted to use pirated software and set a bad example.

2) Children are rarely familiar with it so they will not be distracted by their favorite games, chat programs etc.

These were some of my students’ first attempts.

Jonathan's table tennis player

Lily wagging her tail. Made by Ariel

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Hot Ice (Sodium Acetate) Experiment

Sodium Acetate: a chemical compound made by combining acetic acid and sodium bicarbonate, or simply just plain old vinegar and baking soda. It is used as a flavouring ingredient in snack foods and in hand warmers. Chemical formula: CH3COONa.

This is a video of a first attempt at experimenting with sodium acetate.  Experiment performed in Taipei, Taiwan.

It was a fun experiment to do. The result wasn’t exactly what we were going for. Better luck next time.

Disclaimer: Kids’ Resource Center or the person who posted this video are not responsible for any harm or injury caused in using the information contained in this video. Use the information at your own risk.

To see the successful experiment go here: Sodium Acetate (Hot Ice) Experiment Success

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Simple Magnetometer Science Project Using Water as Lens

(Click on photos to see full size image.)


A magnetometer such as this can detect small changes in the Earth’s magnetic field. It can be useful to monitor these changes as they may indicate the occurrence of natural phenomena that can influence our lives. Certain kinds of solar activity for example, have the potential to disrupt communications and power systems. Large earthquakes are also known to produce magnetic changes prior to their arrival. (This project was originally intended to work in conjunction with the search coil magnetometer project for predicting earthquakes.) Continue reading

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DIY Toy Wooden Tank

Last winter one of our students who had made practically everything, suggested making a
small wooden tank. It was basically an exercise in woodworking techniques. This is how it evolved… Continue reading

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Andy’s animation

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Joyce’s story – Be a Doctor

(PDF – Chinese text)

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Annie’s Scare the Dog story

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Jordan’s Polar Bear story

This was done in one of the winter vacation projects. The story and clay figures are Jordan’s work.

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Henna & Joanne’s broken car story

This story was put together by two students in about an hour on a previously made paper mache landscape. The two (sisters) had been having a tough time with English in school and were getting further “behind the eight ball” when their parents decided some tutoring might help. The use of clay during the lessons made it more interesting and provided plenty of opportunities to connect the English they were learning to something more real than just words on a page.

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Can earthquakes be predicted? A simple magnetometer for detecting earthquake precursors

magnetometer: n. [Magneto- + -meter]
An instrument for measuring the intensity of magnetic forces [1913 Webster]

precursor:  One who, or that which, precedes an event, and indicates its
approach; a forerunner [1913 Webster]

Scientists, particularly in Japan, have for many years been gathering evidence of electromagnetic signals that come from under the ground before earthquakes. The bigger the signal, the bigger the quake is likely to be. This can occur hours before, and in some cases, days or even weeks before the quake itself. Why it happens is not well understood but current theory is that it has to do with rocks creating large electric currents as a result of crushing or grinding under high pressure. Several methods have been used to detect these reportedly erratic, electromagnetic pulses. The method described here is one of the simplest. Technically, it’s called a “search coil magnetometer.” This does not respond to very slow magnetic changes, but it can sense short-term ones, making it suitable for detecting earthquake precursors. Continue reading

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Field Workshop in Taitung and comments on natural farming

We sometimes wondered if it would be possible to travel around, running handcraft workshops in other locations. I was skeptical because there are so many tools and materials used in our projects. Forgetting one particular sized screw or nail might ruin a whole workshop.

We had also wondered if it might be possible to assemble some of our projects into kit sets. The main concern being that if too much preparation is done beforehand, the child won’t learn as much, and one might as well buy a ready-made one from the local toy store.

Finally we had an opportunity to try these things out on a small scale…. Continue reading

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