Frequent contributor to this blog and fellow Hawaii resident, Larry K., helped me solve
a nagging question I had about this photo. I have seen it identified as from the St. Kilda's Sea Baths in Melbourne, Australia, but the architectural details don't match other photos of that venerable place at all. Larry has recently been researching Australian photo sources and informs me that this is the swimming pool in Victoria Park, Kalgoorlie, Western Australia from 1917 by J.J. Dwyer.
Many thanks to Larry for his help.