
The Helium-Neon Laser
Introduction In my laser articles Iv’e often mentioned the helium-neon (He-Ne) laser which I have used to align the feedback mirrors and make holograms. I thought that it would be remiss of me not to [more…]
Introduction In my laser articles Iv’e often mentioned the helium-neon (He-Ne) laser which I have used to align the feedback mirrors and make holograms. I thought that it would be remiss of me not to [more…]
Previously, on “Heat my House” My house is a fairly typical Swedish design, built in the 60s ( it’s 2 years younger than me) with hot water radiators. The whole house, including the heated cellar, [more…]
My wife and I recently drove just shy of three thousand miles to see friends and family in the American Midwest. We started just outside Philadelphia, located in the southeast corner of Pennsylvania on America’s [more…]
Science, like a sport, is an art that’s well practised. To lose educates you more than to win instantly. Okay, that’s corny but I’ve found that my project failures have taught me more information and [more…]
I guess quite a few of you will have had to undergo a Magnetic Resonance Imaging scan over the past few years. As you lie in the machine’s tube with headphones on to muffle the [more…]
Introduction Some of you may know that the Doc has been ill after falling off of a ladder. A very bad accident and I was lucky not to break anything (other than my confidence at [more…]
Introduction As a child I loved playing about with magnets – I still do. They can move heavy objects – such as lifting cars at a scrap yard. They can also move light (-weight!) objects [more…]
Introduction In part one we looked at how a gyroscope seems to defy gravity. This is accomplished by angular momentum. We’ll come back to that later 🙂 In part two we looked at how a [more…]
I have always loved snowflakes. On a chairlift, with your head down into a biting wind, one is allowed about twenty minutes to study them settling on your clothes. They have two classes of symmetry; [more…]
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