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were placed on top of the coverings to keep off rain and drifting snow. It’s not clear how many people survived these treatments.
The early devices had no thermostats, only on-off switches. It was up to the user to remain vigilant and monitor blanket temperature.
To complicate things further, heating wires were hand sewn into the blankets to prevent the wire from shifting. Stitching tended to loosen, causing occasional short circuits, hot spots, and mad dashes for the nearest water bucket.
Modern safety standards and techniques have made today’s blankets safer than ever. Controls on some are so sophisticated that they automatically respond to changing room temperatures to maintain a constant comfort level.
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