Guessing Game Mk III : What Engineering Marvel is this.?

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Originally Posted by p38arover

Many people complain about Whitworth nuts/bolts/threads but they just don't realise the impact they had on engineering. His name should be celebrated, not scorned.

Oh, if , for the original Whitworth spanner sizes, you wonder about the relationship between the spanner size (specified size equals the bolt diameter) and the across flats sizing, it's mathematical. It's https://wikimedia.org/api/rest_v1/me...0c153684325b40 (square root 3) * diameter, i.e., 1.732*diameter - all due to the hexagon nut or bolt head. The length of the hex flat = the bolt diameter so the across flats = 1.732* diameter.

Attachment 125223

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Due to 2nd World War economies the spanner sizes were changed to save metal, hence a 7/16" Whit spanner now fits a 1/2" Whit nut/bolt.

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Originally Posted by Fifth Columnist

Due to 2nd World War economies the spanner sizes were changed to save metal, hence a 7/16" Whit spanner now fits a 1/2" Whit nut/bolt.

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Wasn't just economies. The whole Lend/Lease thing had a hand in it.

That's why I said original Whitworth.

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Originally Posted by scanfor

Foley catheter?

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So, what have you got for us scanfor? :)

Attachment 125259

Boo-yah.
Nixie tube.

Too bloody easy! All yours Toxic

https://www.aulro.com/afvb/images/im...017/07/262.jpg

Jolly good.

Have you been spying on Gav, Mitch?
Your picture looks like some sort of gas vessel.

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Originally Posted by Toxic_Avenger

Boo-yah.
Nixie tube.

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I have several boxes of them in the workshop. My daughter wants me to use them to make a digital clock for her.