BOB era "instrument" approaches

[secretone]

I know from real life experience that simple IFR approaches can be flown with a non directional radio beacon, bearings to the runway from said beacon, and a stopwatch. Whether that's that they did or not, I cannot say...

This method should allow you to descend safely to say 400 feet above the ground assuming that there are no terrain hazards nearby. If the ceiling is lower, then this sort of approach can become very dangerous.