Well, Would you believe I was one of kids in the photo.
my father owned a scaffold and shoring rental company that also rented tower cranes. We used arrow to erect and dismantle the cranes and man hoists. Very easy to lift a boat into a pool. Water displaced 4 inches.
why? After purchasing the owls nest from canoe cove, a large party was planned for the christening at royal van in Stanley park but the boat build was late and the date was a problem. My brother joked about using the pool, and my father grew a smile much like the grinch.
as a foot note, Between 1960 and the mid 80s, we supplied the majority of shoring and equipment on Vancouver concrete structures until the business was sold.