Blowing up Shag Rock on San Francisco Bay in 1900

From the San Francisco Call, May 1, 1900 — FEARFUL SHAG ROCK BLOWN OFF THE MAP Thousands of People Line the Shores of the Bay to Witness the Big Explosion. — Great Column of Water Thrown High Into the Air When the Heavy Charge of Nitro-Gelatin Expanded.
This view of the explosion was taken from the roof of the American Steel and Wire Company, at the corner of Bay and Mason Streets (Fishermen’s Wharf).
For the full article see: https://cdnc.ucr.edu/?a=d&d=SFC19000501.2.9
Image Source: https://npgallery.nps.gov/