Many laboratories are equipped with either a diamond saw or a thin carborundum wheel for cutting small specimens of minerals or rocks but very few are equipped to cut specimens 3 inches or more across. Believing that this subject may be of interest to mineralogists and petrologists I shall describe an inexpensive and mechanically simple rock saw adapted from the “gang saw” used extensively in the marble industry. In the field office, of the Section of Metalliferous Deposits of the U. S. Geological Survey, at Golden, Colorado, this saw has proved itself very useful for cutting both large and small specimens.

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