Demonstrates the differences between alternating current and direct current arc welding processes, and in particular the finer control available with AC machines at the time.
1/1/1944
9/10/2014
1/1/1949
8/18/2014
11/15/2013
12/31/1938
4/3/2013
1/1/1999
1/23/1987
1/1/1996
4/1/1999
11/25/2011
6/30/1996
1/1/1972
4/23/1986
4/15/1931
1/1/1997
6/6/1984
5/23/2006
2/10/2009
7/11/2006