1906 Baker Advert

http://books.google.com/books?id=NNJNAAA...;q=&f=false

Info hits that American makers imported all their tubes "in the rough".

Amateur Sportsman 1910 on tubes "Gun Barrels Past and Present": http://books.google.com/books?id=m5kXAAA...;q=&f=false

Kind Regards,

Raimey
rse