SURVEYING BY JAMES UNDERHILL, PH. D. U. S. Mineral Surveyor for Colorado THIRD EDITION REVISED NEW YORK JOHN WILEY & SONS, INC. LONDON CHAPMAN & HALL. LIMITED HARVARD UNIVERSITY COPYRIGHT, 1922 BY JAMES UNDERHILL TECHNICAL COMPOSITION CO. PREFACE TO THE THIRD EDITION In this edition several additions have been made, especially in the treatment of the direct solar observation. The specimen field notes, to illustrate the requirements of the office of the United States Surveyor General for Colorado, have been entirely rewritten, a different group of claims being used, and represent the practice at the present time. Thanks are due Mr. F. E. France of the office of the United States Surveyor General for valuable help and suggestions in making up the notes. 14063 |