I only went caving once with Robert. I don’t like crawling in confined spaces, even under my house to run cables (I’ve paid local kids to drag phone and Ethernet cables under the house). I’m ok in confined spaces if I can stand or sit.
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That is interesting about the magnetic drum! Around 1978 I was working as an electrician on a DP(dynamic positioned) oil rig drillship. It had two separate computer systems, one (Honeywell) that controlled the positioning system, and another that ran the engine room and power generating system. That one had a "magnetic drum" but it was the ET that maintained it, not me. I never could find out how it worked, except that I was told it was a common small type of system used in the US to run such things as saw mills. The drum would not have been anywhere near as big as the one shown in your video, as it was in a much smaller cabinet. I cannot recall who the manufacturer was.Quote:
The MRSC used a FASTRAND II magnetic drum for storage
The ship itself, although only about a year old at the time, had twin screws driven by old submarine DC propulsion motors! 6 on each shaft if I recall correctly, speed and direction SCR controlled.
Most of those wires would be redundant in an EV.