62 replies to this topic

[phildunford]

http://www.youtube.com/watch?v=OWZE6g6Ytlw&feature=related
looks like its straight off a ufo never mind invented in 1902?

Used to have one in the Science Museum - In fact used to be the standard way of getting DC current from an AC supply! Happy days!

[dr thrust]

the future of transport?

Edited by dr thrust, 11 September 2012 - 09:39 PM.

[Peret]

Used to have one in the Science Museum - In fact used to be the standard way of getting DC current from an AC supply! Happy days!

I remember that rectifier in the Science Museum from when I was about 8. It was my favourite exhibit, I'd stand there pressing the button over and over. Later I saw a big bank of them in action at one of the substations on the Southern Railway, which ran on 600VDC. Each one must have had 20 pounds of mercury in it - one pound of Hg is a little less volume than a golf ball.

Somehow, solid state rectifiers and thyristor banks don't have the same appeal.

[cooperman435]

Makes my Dewalt radio in the workshop a bit low effort now :-(

[dr thrust]

dam those pesky clever germans

Edited by dr thrust, 01 July 2015 - 06:14 PM.

[barnsley-mark]

Interesting film, I didn't realise the v2 was so big. Also really down to earth (no punning intended) engineering and construction.

[Bob Twells]

Fireworks from above:

[barnsley-mark]

I was thinking some of the rockets were getting close - interesting view point regarding bursts - so different when they are falling away.

[phildunford]

Here's a mercury arc rectifier that I think is still in use...

[Bob Twells]

Fireworks animation:

[phildunford]

http://www.youtube.com/watch?v=jJXVx9RHAfQ&feature=related really enjoyed this one

Genius!

[dr thrust]

got any spare mortar tubes...? [img]http://www.pyrosocie...ult/sleep.gif[/

Edited by dr thrust, 01 July 2015 - 06:48 PM.

[barnsley-mark]

1341523510[/url]' post='77069']
Genius!

They are amazing

[dr thrust]

An interesting video on ball milling http://m.youtube.com...h?v=O2-gg0C2Asw
Best turn the volume down though lol

Edited by dr thrust, 25 August 2012 - 04:19 PM.

[Vic]

How to make some kindling firewood with black powder.

Splitting Wood with Black Powder