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Things that make you :)


Andy Y
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6 hours ago, manna said:

G'day Folks

 

Latest firefighting equipment..........

 

86766382_10220820568334339_5923829038803058688_n.jpg

I like what looks like a siren on the front wheel.:good_mini:

(Plus a hose nozzle & crow bar)

Edited by melmerby
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That sir is, I believe, a “carbide lamp”. The lower part contains calcium carbide, the upper part water and there is a valve that connects the two chambers. As water falls onto the carbide, acetylene is released which is piped to the centre of the reflector and burns to give a rather yellow light, good enough in pitch black holes. The (much simplified and crude version of the) chemistry is as follows:

Calcium Carbide (CaC2) + Water (H2O) = Calcium Oxide (CaO) + Acetylene (C2H2)

For further reading (if interested), look up Union Carbide and Frederick Baldwin’s New York patent of 1900 for a bicycle carbide lamp.

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Pity the gag's inaccurate!

Archimedes of Syracuse didn't calculate a definitive Pi or a way to deduce it, only a pretty close approximation.

Even the ancient Egyptians, a millenium earlier, got close. (3.1605)

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25 minutes ago, kevinlms said:

No, I’ll quietly fester here thanks. I did however notice the advert to the left indicating where Richard Branson’s ugly new cruise ship is going to be employed and the intended clientele - another that I shall quietly allow to pass me by! :lol:

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