The seminal sketch

I was sorting through some old stuff recently and came across the original sketch of the PDL systems. Although I was eventually going to use XtrackCAD to plan the system I find that paper and pencil works best for concepts – so here it is the rough sketch that started it all. You can see that at that time I have thought of a turntable or a traverser – but had just lighted on a 4′ diameter turn-around loop.

 

 

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