It's actually amazing what you learn on this list from time to time (apart from 
how methods of measuring things can take over some people and make them 
personally aggressive that is!)
As a car enthusiast - which is a very expensive hobby unfortunately - the term 
'tonneau' is used to describe a soft top for cabriolet (drop head) cars to 
cover over the 'living quarters' (so to speak) in order to protect the cockpit 
from rain - usually as a temporary measure (ie to quickly protect against a 
shower).
I wonder how the term came about and why it appears to have been adopted from a 
metric measure?  Currently I'm looking for one for our latest metal addition to 
the family (a Triumph Stag).

Steve

Date: Sun, 26 Apr 2009 04:22:43 -0700
From: [email protected]
Subject: [USMA:44874] Metric Act of 1866, was IEEE/ASTM SI-10
To: [email protected]

Pat,
 
The USMA laws page includes the Metric Act of 1866.  It has been amended to 
remove invalid conversion tables, but the history section at the bottom has 
scans of the actual bill and tables.
 
We were using meter, liter and deka- at the time.  However, the metric ton 
(1000 kg) is described with two terms, tonneau and millier,  I assume 
"everyone" later simplified tonneau to tonne, and the other died out.
 
However, both sets of spelling have been used.  The Mendenhall Order of 1893 
(found on same page) uses metre, litre, and even gramme.
 
Also on the same page, U. S. Grant's report to Congress on the Treaty of the 
Meter uses "meter" but it is only a US report, not the original.
 
Finally, the Upton report of 1878 seems to indicate that the original spellings 
of "are" and "stere" (cubic meter) omitted the final "e", although the Metric 
Act of 1866 shows a final "e" in both cases.
 
These are just data points.  I've never seen anything that would represent a 
scholarly tracking of the situation.
 
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