I like to find electronic oddities on eBay and then try to make something interesting out of them. Before the internet I used a company called Greenweld Electronics for surplus and unusual electronic components. In [more…]
There are lots of technical problems in designing a liquid fuelled rocket; such as how do you light it, relight it, how do you stop combustion instability shaking the rocket to pieces, how do you [more…]
Melting a hole through steel: The above image needs a little explanation! The Doc messed up his camera settings and under exposed the image. So I loaded it into Gimp and played with the curves [more…]
There are lots of weird and wonderful schemes for powering spacecraft, but in practice only three classes of engine have been built today that could realistically power a spacecraft in the next few decades. (aside: [more…]
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…]
The amount of times I see people posting here – “World ending asteroid hit us please now the world is too crazy!” Well I am here to bring a mild warning, many people understand what [more…]
Herbert O Yardley was a a code clerk in the US State Department who took an interest in codes and ciphers. He taught himself as much as he could and he proposed a cryptographic bureau. [more…]
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…]
(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…]
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