Show SUBMARINE MINE J PRACTICE AT SAN DIEGO SAN DIEGO Cal May Ia 19 Three submarine mi mines es will ill bo be exploded in inthe the tho harbor tomorrow in full fun view of Port Fort For or several weeks the twenty eighth company of coast const artil Je lery lory at t the tho fort has has' been receiving instructions in in- in handling mines on the mine plan planting tint steamer Armistead The Tho Themen I Imen men mn tomorrow mornin morning will plant three mines near the fort Later In m tho the dB day a h boat at towed the Armistead will passover pass passover over oer the mines and they will be successively sivel exploded b by an electric spark controlled from tho the shore This will complete completo the course of instruction given en b by tho the Armistead here and sho she will then go JO north |