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New Zealand's first therapeutic spa opened in Rotorua in 1885 and spa treatments soon became popular. This man is receiving an electricity-based treatment in a slipper bath at the government spa in Rotorua in the 1920s. The combination of water and electricity seems alarming, but presumably the patient was insulated from life-threatening shocks.
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Reference: PA1-f-051-28-3
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.