Show A treat Kniliieerlng real A romnrknblo cnglneerlLH feat VM recently performed < In California In providing a bulwark for I great dam being built to Impound water for Ban FrnnclKO lly I single blast I soctloi of a mountain wee turnoff turn-off slid hurled Into a gorge below Two month were required lu preparation for ho blast In tunnel cut Into tha mounUIn ot rock great stores of black powder were placed while depoilti 01 giant powder were located under tho maaa to bo moved Tbo black powder Unite dower than the granite powder pow-der and the effect when electricity wtu applied to both at once was first to lift up the mail and then push I over the outgo Into the gorge A mal of rock measuring 400x00 feet and weighing nn ntlmated 150000 tons had was planned thrown exactly 01 the engineer |