Niton Test V14-84A & 1753 G-II 1/2d

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From PLMossman@aol.com Thu May 16 16:35:40 2002
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Date: Thu, 16 May 2002 19:35:34 EDT
Subject: Re: [Colonial Numismatics] Re: Niton Test V14-84A & 1753 G-II 1/2d
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In a message dated 5/16/2002 12:38:05 PM Eastern Daylight Time,
mhodder@theworld.com writes:

> Phil:
>
> Please post the gist and source of Newton's observations, if you
> would.
>
The references are in my book on p. 113. They are from Craig's, Newton at
the Mint, page 97. I don't own the book but did Xerox the pertinent pages.
The gist is that the addition of as little as 0.25% tin to copper made it
more malleable but Newton said in [? 1713] that NO MORE tin was to be added
to the copper since it reduced the intrinsic value of the coins. Pure copper
is malleable when red hot whereas if there is tin added, it will crack when
hit with a hammer. This was their only practical assay test.
>
> I wonder what the source of the tin might have been? Old pewter?
>
The tin would have been from the Cornish tin mines. They were sort of like
today's tobacco industry - the politicians were finding all reasons to keep
them afloat.

> If I found tin in a coin I wasn't sure was struck or cast, are you
> suggesting that it most likely is a cast because I saw tin in it?
>
> There would be no tin in any regal coins during Newton's regime. Probably
> the William III coppers had tin because they were cast planchets made by
> contractors.
>
Phil

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<HTML>In a message dated 5/16/2002 12:38:05 PM Eastern Daylight Time, mhodder@theworld.com writes:
 
 <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Phil:
 
 Please post the gist and source of Newton's observations, if you
 would.
 </BLOCKQUOTE>
 The references are in my book on p. 113. They are from Craig's, Newton at the Mint, page 97. I don't own the book but did Xerox the pertinent pages. The gist is that the addition of as little as 0.25% tin to copper made it more malleable but Newton said in [? 1713] that NO MORE tin was to be added to the copper since it reduced the intrinsic value of the coins. Pure copper is malleable when red hot whereas if there is tin added, it will crack when hit with a hammer. This was their only practical assay test.
 <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">
 I wonder what the source of the tin might have been? Old pewter?
 </BLOCKQUOTE>
 The tin would have been from the Cornish tin mines. They were sort of like today's tobacco industry - the politicians were finding all reasons to keep them afloat.
 
 <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">If I found tin in a coin I wasn't sure was struck or cast, are you suggesting that it most likely is a cast because I saw tin in it?
 
 There would be no tin in any regal coins during Newton's regime. Probably the William III coppers had tin because they were cast planchets made by contractors.
 </BLOCKQUOTE>
 Phil
 
 
 </HTML>

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Veröffentlichungsdatum

2002-05-16

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Niton Test V14-84A & 1753 G-II 1/2d Öffentlichkeit Deposited

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