SUPPLEMENTARY VOLUME PENNSYLVANIA BY WILLIAM W. RUPERT, C.E. SUPERINTENDENT OF SCHOOLS, POTTSTOWN, PENNSYLVANIA New York THE MACMILLAN COMPANY LONDON: MACMILLAN & CO., LTD. 1903 All rights reserved PREFACE FOR the general plan of this Supplement, and for kindly and helpful criticisms, I am greatly indebted to the authors. of the Series. Acknowledgment is also due for the following photographs: Figs. 1, 2, and 44, presented by Professor Milton C. Cooper of Philadelphia; Figs. 5 and 42, presented by Professor Ralph S. Tarr of Cornell University; Figs. 6 and 35, presented by Dr. J. T. Rothrock, Commissioner of Forestry; Figs. 7, 8, 9, 10, 11, 12, and 13, presented by Professor Daniel S. Hartline of the Bloomsburg State Normal School; Figs. 17 and 18, presented by the Westinghouse Air Brake Company; Figs. 21, 23, and 24, presented by Superintendent D. A. Harman of Hazleton, Pennsylvania; Figs. 26, 27, and 28, presented by the American Bridge Company; Fig. 46, presented by my wife; Fig. 48, presented by Miss Effie Starrett, teacher in Pottstown schools; Fig. 50, presented by Dr. J. P. McCaskey of Lancaster; Fig. 53, presented by Dr. Daniel Carhart of Western University of Pennsylvania. Hearty thanks are tendered to city and borough superintendents all over the state for valuable information respecting local matters. POTTSTOWN, PA., V WILLIAM W. RUPERT. |