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Technology

Engineering

Making A Ruby Laser – Part Four

11th September 2018 Doc Mike Finnley 1856 Comments

The Doc’s ruby laser focused onto a lighter flint. The flint has been glued to the end of a match stick. The ‘explosion’ measures approximately 4 inches diameter. Interesting things to note are the ‘candy [more…]

Engineering

Making A Ruby Laser – Part Three

14th August 2018 Doc Mike Finnley 2666 Comments

More information on laser speckle can be found here:  Speckle pattern A Mirror Alignment Tool The most important part of constructing a ruby laser (or any laser with external mirrors) are getting the mirrors alligned [more…]

Dr Mike Finnley, Going Postal
Engineering

Making A Ruby Laser – Part Two

31st July 2018 Doc Mike Finnley 2178 Comments

(a ruby rod lit by two bright blue LEDs. Due to the IR filter in my camera the pink colour is actually red. What you are seeing is the absorption of the blue light and the [more…]

Engineering

Making A Ruby Laser – Part One

21st July 2018 Doc Mike Finnley 1750 Comments

Introduction For many years the Doc has had the desire to attempt the construction of a ruby laser. After six months of hard work, disappointment, late nights, lots of booze and a drained bank account [more…]

20th Century

The Spitfire, of course

29th May 2018 GrumpyAngler 3804 Comments

Ask anyone from the general public to name a great aeroplane or a great British fighter of WWII, and chances are they will say, without hesitation, “The Spitfire of course.” If you ask why you [more…]

20th Century

The Baby Boeing

2nd April 2018 Æthelberht 1494 Comments

I think most of us here don’t get terribly excited at the thought of the Boeing 737. It’s quite mundane, unremarkable, pedestrian even. I suspect more than a few of us here have been herded [more…]

Beware of Geeks Bearing GIFs, Going Postal
Engineering

I Learned About Flying From That

17th September 2017 Beware of Geeks bearing GIFs 0 Comments

When I was a young boy, I hated flying. I mean, really hated it. I think it was due to a traumatic flying experience on a transatlantic flight to Florida in a 747, back in [more…]

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