Google had never heard of Skeduflo. I hadn't either, and I once did work on critical path programs using UNIVAC computers. It was apparently an analog computer for computing PERT charts. It probably never got beyond the prototype, or there would be more history around it.

That's a neat idea. I can see how it would work. A PERT chart is a time-oriented acyclic dependency graph. Each task has a duration, and tasks can be in parallel. At join points in the graph, the later end time determines the time value for the end node, and that feeds the following tasks.

So an analog computer could do this with voltage=time and resistance=duration. The picture shows a compact plugboard at the lower right. That's the dependency graph. Then there are lots of knobs, for setting task duration. For each join point, there would be a circuit to pass through the higher voltage (maybe just diodes, although diode drop would be a problem; might need an op amp). Then you have lights to tell you which path is longer at each join point. Now you can tweak the knobs and adjust the schedule. There ought to be a meter available for reading out times, but maybe that's external.