GEOGRAPHIC ADMINISTRATION BUILDINGS SIXTEENTH AND M STREETS NORTHWEST, WASHINGTON, D. C. GILBERT GROSVENOR, President JOHN OLIVER LA GORCE, Vice-President JOHN JOY EDSON, Treasurer FRED M. BERTHRONG, Assistant Treasurer HENRY WHITE, Vice-President O. P. AUSTIN, Secretary ORGANIZED FOR "THE INCREASE TO carry out the purposes for which it was founded thirty-eight years ago, the National Geographic Society publishes this Magazine. All receipts are invested in the Magazine itself or expended directly to promote geographic knowledge. AND DIFFUSION OF GEOGRAPHIC KNOWLEDGE" discoveries form a large share of our knowledge of a civilization waning when Pizarro first set foot in Peru. THE Society also had the honor of subscribing a substantial sum to the expedition of Admiral Peary, who discovered the North Pole. NOT long ago The Society granted $25,000, and in addition $75.000 was given by individual members to the Government when the congressional appropriation for the purpose was insufficient, and the finest of the giant sequoia trees of California were thereby saved for the American people. ARTICLES and photographs are desired. IMMEDIATELY after the terrific eruption THE Society is conducting extensive explorations and excavations in northwestern New Mexico, which was one of the most densely populated areas in North America before Columbus came, a region where prehistoric peoples lived in vast com. munal dwellings and whose customs, ceremonies, and name have been engulfed in an oblivion. THE Society also is maintaining expeditions in the unknown area adjacent to the San Juan River in southeastern Utah, and in Yunnan, Kweichow, and Kansu, China-all regions virgin to scientific study. Copyright, 1926, by National Geographic Society, Washington, D. C., in the United States and Great Britain. All rights reserved. Entered at the Post Office at Washington, D. C., as Second-Class Mail Matter. Acceptance for mailing at special rate of postage provided for in Sec. 1103, Act of October 3, 1917, authorized July 1, 1918. "Who sells it?" is Certain jewelers have built up one country or in makers' tests You can rely on the judgment ing in your hands the most accu 12 A view in the beader Toom Crawford Avenue Station of Commos WELL disen Com pur ChicREL Iwe SUDOPE and one 160.000 W zurbo-gearators ant served by 15 Loltes already installed 800 kv.urbo-gen erator and 5 more hule now be ng added. Pressure 60f pozdr zemunerating 5 Sarren and units. CocaGratan Anderson Probes and White archrines P m stalled by WA H Pone Chicaga CRANE #PRE MATRULEONEAN LIQUID, SAS, OIL P, up, up, go steam pressures and temlower cost. The prevailing steam pressures when Crane Co. was founded in 1855 were 35 to 50 pounds to the square inch. Today, the Crawford Avenue Station of the Commonwealth Edison Company, Chicago, operates at 600 pounds. What will pressures be in 1955? The answer will come as engineers, in pursuit of increased operating efficiency, specify higher pressures and temperatures. Always, the Crane chemical and metallurgical laboratories are abreast of their demands. With confidence, they look to Crane for safe materials. For as pressures and temperatures are increased to save coal, new hazards come, greater strains on metals that lose strength as temperatures rise. So the prime requirement is safety, safety of plant and safety of human life. To this responsibility of supplying safe piping equipment to hold in leash the tremendous power of high pressures and superheat, Crane experience and research are dedicated. product for the purpose To serve every human activity, there are Crane products precisely engineered for their particular tasks. You may need giant valves for waterworks, power plant, or oil field; or only a small faucet to control running water. Crane makes them all in many types and sizes: for safety, dependability, and economy. CRANE PIPING MATERIALS TO CONVEY AND CONTROL STEAM, LIQUID, GAS, OIL WRITE CRANE CO., GENERAL OFFICES, 836 S. MICHIGAN AVENUE, CHICAGO Branches and Sales Offices in One Hundred and Fifty-five Cities National Exhibit Rooms: Chicago, New York, Atlantic City, San Francisco and Montreal CRANE EXPORT CORPORATION: NEW YORK, SAN FRANCISCO, MEXICO CITY, HAVANA C CRANE: PARIS, BRUSSELS |
