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Non-electric alerting devices for barns

Question asked by lloveman on Dec 9, 2015
Latest reply on Dec 14, 2015 by kidwellk

I've recently received a request on my website, Fire Safety for Barns, for information regarding non-electric alerting systems for horse stables and livestock barns in Amish and Mennonite communities.  Are any such alerting systems available that operate on batteries of large enough capacity to be reliable in environments that can range from humid to dusty?  Are there other means, besides batteries, of providing power to operate such systems?   The writer has in mind some type of intercom connecting stables or barns to the residence.