The US Company of Military Historians published an article by Robert Stone
Heres the citation: Robert G. Stone, "British Military Blankets, 1776-1813," Military Collector & Historian
, vol. 49, no. 1 (Spring 1997), 37-39.
In the article, he describes the stripe yarn as medium to dark brown which he supposes to originally black, but it is interesting to note that his reproductions now have blue yarn for stripes.
In his product flyer from July 2008 Stone states that his reproduction blanket is a composite of 13 original British Army blankets researched in various collections. His repro blanket dimensions are 67 x 86; has double woven stripes at each end (AWI blue, 1812 brown), and different placement of GR stamp for each period.
http://www.1stusinfantry.com/uploads/5/ ... _stone.pdf
The Revlist forum has a few posts that expand on this information.
On 5 November 2000 Katie Caddell noted,
The blankets are all in public collections which include the Lexington (Massachusetts) Historical Society; Fort Ticonderoga; New Windsor Cantonment State Historic Site, New York; Naval Museum, Washington Navy Yard; and the Maine Historical Society, which has an impressive 4 blankets in its collection.
http://groups.yahoo.com/neo/groups/Revl ... pics/24464
Dana Twiss posted this on 1 July 2007 regarding the blankets examined by Stone that are in the collection of the Maine Historical Society:
To add to the discussion, in my day job, I recently catalogued four or five British issue blankets that were aboard the HMS Boxer when it was captured. While the event is 1812, the blankets fully fit the description of 18th century British military issue blankets. While inconsistent in size, which may have been due as much from use as construction, they were all consistent in the following features:
1-top and botton there were two parallet brown stripes running from edge to edge. Each stripe was approximately 1/8th inch wide and the stripes were 1/4" apart. The outermost stripe ran 2" from the edge, top and bottom.
2-The broad arrow point touched the bottom of the top two stripes, the tips of the arrow are 4.5" apart, the shaft of the arrow was 4" long. (I neglected to measure how far in the shaft was from the edge for my notes).
3-Th GR was below the arrow, and 4.5" tall. The G was 3" wide, the R 3.5" wide, the space between then was 3.5", and the tip of the leg on the R was 1.5" from the edge.
This particular blanket had one yellow point and was apparently made in or around the Whitney area as it was woven full width, not pieced. Wool was a natural, "off-white".
The blankets, overall, measured approximately 93" long and 64" wide with some variation which can be attributed as much to use and "care" as inconsistency in manufacture.
Apparently the auction of the goods aboard the Boxer gave everyone in Portland (then known a Falmouth), Maine an opportunity to have a blanket as there are several in the collections of the Maine Historical Society.
http://groups.yahoo.com/neo/groups/Revl ... pics/97233
In a post from the same date Steve Rayner noted that the blanket in the Ft. Ticonderoga collection is similar to the Boxer blankets.
Blanket size is interesting. Here is a summary of what Ive found so far:
Henderson article: 90 x 72
Trotter letter: 84 x 66 (4 lb 3 oz)
Bradford AWI: 84.5 x 65.5
Boxer 1812 (x4): 93 x 64
Stone repro: 86 x 67
Brit hospital: 90 x69 (4 lb)
Note that although the 1812 blankets from the HMS Boxer are approximately 93 x 64, Stones reproductions are 86 x 67, which is closer to the AWI blanket dimensions. (My modern hospital blanket actually comes closest to the dimensions of the Boxer blankets, and at 4 lbs is close in weight to the Trotter letter specs. Too bad it does not have the end stripes.)
My conclusions: a British Army blanket from the 1812 period would be approximately 93 x 64, have two black/brown lines woven at each end, and the broad arrow/GR marking as described by Dana Twiss.