. The Granite monthly : a magazine of literature, history and state progress. e below, a smallbrook pauses a moment in a pool atthe foot of a beautiful little fall, be-fore joining the main stream in itsrapid course down over graniteledges and gleaming gravel to thepeaceful meadows below. Under shadow of Mount Cardiganare several mica mines, and the ex-plosion of dynamite is now heard in-stead of the hum of sawmills. Be-tween Isinglass hill in Grafton andthe town of Groton, there are threelarger mines operated by steam, andseveral smaller mines where handdrills are used. Professor Hitchcocks t
. The Granite monthly : a magazine of literature, history and state progress. e below, a smallbrook pauses a moment in a pool atthe foot of a beautiful little fall, be-fore joining the main stream in itsrapid course down over graniteledges and gleaming gravel to thepeaceful meadows below. Under shadow of Mount Cardiganare several mica mines, and the ex-plosion of dynamite is now heard in-stead of the hum of sawmills. Be-tween Isinglass hill in Grafton andthe town of Groton, there are threelarger mines operated by steam, andseveral smaller mines where handdrills are used. Professor Hitchcocks theory ofthe formation of granite and mica isas follows: The primeval depositsof sand and clay, by the action ofsteam, heat, and chemical agents, have been changed into gneiss and granite. The large crystals offeldspar and the scales of mica arethe products of the alteration ofclay. Mica was quarried on Isin-glass hill in Grafton more than onehundred years ago. The first methodemployed in mining was to buildlarge fires on the rock, and, whenthe surface was heated, water was. %?. *$&t \ -. .
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