magnetic drums

Mike Loewen mloewen at
Mon Nov 24 12:49:20 CST 2008

    This section of the SAGE "Theory of Operation of Drum System for 
AN/FSQ-7 Combat Direction Central and AN/FSQ-8 Combat Control Central" 
document (1958) talks about the composition of the magnetic drum rotors:

"Section Drum Rotor

    The magnetic drum rotor (figs. 1-5 and 1-6) is a Monel metal cylinder, 
coated with copper and plated with nickel-cobalt.  The 0.01-inch copper 
coating fills the porosity of the Monel metal and provides a diamond 
polished surface.  The 0.0005-inch nickel cobalt plating is a dia-magnetic 
alloy characterized by high remanence.  This plating provides the magnetic 
storage capabilities of the drum surface.  The rotor is 10.7 inches in 
diameter, 12.5 inches long, and weighs 105 pounds.  Its shaft is mounted 
on ball bearings and has a toothed pulley connected by a belt to the drum 
motor pulley."

Mike Loewen				mloewen at
Old Technology

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