> Looking to get good colour photos of some of these > older HP counters (and similar offerings from other > manufacturers) in the pre/early Nixie etc period.
Here's an opportunity to own an HP 522B for $25, including shipping in the US. The unit has 5 decades of ten vertical neon indicators each. It works. Yes, it's a 100KC counter/ timer. I got it from a blasting cap plant where I worked in the early sixties. It was used to measure the delay time of time delayed blasting caps, used to remove successive layers of rock from a quarry or tunnel wall. The start pulse came from the blasting machine, attenuated. The stop circuit was normally closed by a pencil lead held in alligator clips for quick replacement. The cap broke the lead when it fired. For a while, it was used in Pinewood Derby races. It has never been exposed to weather and looks new inside. Bill Hawkins [EMAIL PROTECTED] _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
