Show VIC bl R hock ft kiowa sra top 1 la 54 ijo Us af shortly after boom thursday Thur lay arch rock rack one of the greatest ii obstructions ol to sea navigation in sin san francisco bay destroyed dei troyed over ever thirty too tons ot of altro e belof being employed empl to re wave be the rock rac k which lay boat aid told way alcatraz island and bock rock point the rock tag several acre acres in extent so and d all bat but it its summit wa was under braur the explosion vr set t off by electricity and 0 o tt TW loss the canons lon that rock and debris were mat seat tarcil it red over a vest creat are area aad and A conar of water and aone over 1000 feet la in height beight carose ros from the bay ft Is wonderful eight abe orce of the explosion was ter and dd could be b felt la in many section of the city large quantities of fish were destroyed lettro jed |