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<DIV><FONT face=3DArial size=3D2>What I should have added was it seems to m=
e that=20
after 1850, generally, JT & Co used angular canons, radial &=20
conventional, and flat heads. They (?) never used Doncaster heads.</FONT></=
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<DIV><FONT face=3DArial size=3D2>JW & Sons used engular canons, convent=
ional but=20
not radial and Doncaster heads; later and occasionally flat heads.</FONT></=
DIV>
<DIV><FONT face=3DArial size=3D2>M&S used traditional conventional cano=
ns until=20
taking Doncasters on board, eschewing angular canons or flat heads.</FONT><=
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<DIV><FONT face=3DArial size=3D2>D</FONT></DIV></BODY></HTML>