Bunnell Pony Relay




Bunnell Pony Relay

12A       Considering the "spectacle" frame of the CQA, I'm surprised that Bunnell didn't describe this little relay as having a "monocle" stop post.

      A pony relay is smaller than a main line relay (this model measures 6 by 3.5 inches) and its resistance is lower. Where main line relay are commonly wound to 150 ohms (the minimum is 120 ohms), pony relays won't exceed 100 ohms.

      In a construction method popular with many manufacturers of relays, the wood base is itself mounted on a cast iron "surbase," as Bunnell called it (that's an architectural term). In addition to adding weight for stability and improved looks, the surbase provided a space under the wood base for mechanical and electrical connections.

      Pony relays are not as big and impressive on the collector's shelf as the larger models, but the 1900 model with its unique stop post and horizontal tension adjuster will hold its own in any display of instruments.

12B       The contact post of this small relay mimics the tubular gooseneck found on many pony and main line relays. While this single spool relay was not designed for telegraph work, a two-spool version on the typical wood and iron base was also available for use on landlines.

12C      In commercial telegraph work, a proper word count was important. It could determine the charge for a telegram, the pay for a reporter, or the wage for an operator. If you collect telegraph instruments, don't overlook accessories like this.

Pony Relay

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