What is it? 12/12/2005

[Wingnut]

Okay here is the next item:


It was used by sailors, firemen, and miners for 1820-1960 named after its inventor.


Have Fun!!!!

[Wingnut]

Btw isn't that a nice floor I put in?

[Rodster]

Yup
Great looking floor.
Rodster

[Wingnut]

what is it?
From Freebird
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I'm guessing Coleman? as in Lantern. Nice floor too!
__________________
1956 Cub Lo-Boy
JD LT133
We live so far from the mainland, our power goes out more than we do!

[Wingnut]

No it is a lamp of sorts

[bontai Joe]

Why that's a "One if by Land, Two if by sea" Lamp! Weren't they manufactured by Fred Revere? Pauls not so famous brother?

[Wingnut]

Freebird know the answer should he tell or are others still guessing?

[Oslo in NC]

If used as a minors lamp, I suspect the copper shroud with holes in it were there, of course to let in air, but the physics of it the copper dissipates the heat so rapidly that it won't let gases in the mine be ignited by the flame in the lamp. Now, get rid of that dirty old lamp off that beautiful. I'll send my address where you can dispose of that lamp. he he

[Wingnut]

If used as a minors lamp, I suspect the copper shroud with holes in it were there, of course to let in air, but the physics of it the copper dissipates the heat so rapidly that it won't let gases in the mine be ignited by the flame in the lamp. Now, get rid of that dirty old lamp off that beautiful. I'll send my address where you can dispose of that lamp. he he


That how it works and what its used for!!!!!!!

[freebird]

Lips zipped here! "The suspense is incredible, I hope it will last!" - Willy Wonka

[Wingnut]

Lips zipped here! "The suspense is incredible, I hope it will last!" - Willy Wonka


You are cruel Mr. Freebird ROF ROF


Tomorrows game is going to be harder!!!!!

[glenn27]

Miner's lamp, isn't it?... after they stopped using canaries to deteck the gases...

[Wingnut]

It's slang term for it. It was named after the invertor!

[Wingnut]

Anymore guesses?

[glenn27]

We (I) give up...This time.... :not_worth :not_worth :not_worth

[Greg]

It's a Davy lamp, used to test the presence of fire-damp.

[Wingnut]

Freebird had it! first Greg Second.

The Davy lamp is a candle containing safety lamp devised in 1815 by Humphry Davy. It was created for use in coal mines, allowing deep seams to be mined despite the presence of methane and other flammable gases, called firedamp or minedamp.

Davy had discovered that, to explode, the gas must be heated to its ignition temperature and that if such heating is prevented, combustion cannot occur. If the flame in a lamp is surrounded by metal gauze to distribute the heat over a large area, the maximum temperature of the screen is below the ignition temperature of the gas. The first trial of a Davy lamp with a wire sieve was at Hebburn Colliery on 9 January 1816.

The lamp also provided a crude test for the presence of gases. If inflammable gas mixtures were present, the flame of the Davy lamp burned higher with a blue tinge. Miners could also place a safety lamp close to the ground to detect gases, such as carbon dioxide, that are denser than air and so could collect in depressions in the mine, if the mine air was oxygen-poor, the lamp flame would be extinguished (chokedamp).

There was some controversy, since George Stephenson also produced a similar safety lamp, called the Geordie lamp in 1815.

How far the difference was appreciated at the time is hard to say; supporters of both men seem to have regarded the other as having copied their man’s idea and copied it wrongly. The Stephenson lamp (with no gauze around the flame) gave a brighter light and was popular with the pitmen. The Davy lamp was simpler and cheaper to make and was popular with the mineowners.

There were supposed safety arguments on both sides: in principle, a poorly maintained (or badly designed) Davy lamp could overheat the gauze if it met a high concentration of methane. A more serious objection to the Stephenson lamp was that it stopped being a safety lamp if the glass was broken. In the long term, the Davy lamp (or at least the principle of a gauze enclosure round the flame) won out.