ciple of dynamical reversibility. The principle of microscopic reversibility. Applications. Monday, November 22-" SOME APPLICATIONS OF STATISTICAL MECHANICS TO SYSTEMS THAT ARE CHANGING TOWARDS THE CONDITION OF EQUILIBRIUM." Boltzmann's H-Theorem. Extensions of the H-Theorem. Critique of the H-Theorem. Transport problems. Rate of chemical reaction. The existence of homogeneous non-catalyzed gas reactions. The rate of decomposition of nitrogen pentoxide. The temperature coefficient of rate of decomposition. The mechanism of activation. The transfer of energy to molecules. CHRISTMAS WEEK LECTURES FOR YOUNG PEOPLE BY ROBERT W. WOOD PROFESSOR OF PHYSICS, JOHNS HOPKINS UNIVERSITY, BALTIMORE December 27, 28, 30 and 31, 1926, at Three O'Clock, P.M. RECREATIONS WITH RADIATIONS Monday, December 27, 1926 Analogies between sound and light. Waves originated by vibrators. Things that vibrate. Interference of sound-waves, two sounds producing silence. Resonance: a vibrator set in motion by waves. Detectors of sound and light other than the ear and eye. Singing flames and the rotating mirror. Beats between two flames of different pitch. Flames that hear notes inaudible to the ear, and flash in rhythm to the ticking of a watch. Rijke's tube or the organ pipe that blows itself. High frequency sounds that destroy life. Water jets that are sensitive to sound. Why the drops scatter in a fountain. Scattering prevented by electricity. How rain drops form and why we have large drops in a thunderstorm. Can rain be induced artificially? Rain makers and their devices. Stroboscopic experiments with the fountain. Electrical vibrators and Hertz waves. An electrical system that pulsates every three seconds. TUESDAY, DECEMBER 28, 1926 Why we think that light consists of waves. White light and colored light. A lamp which causes moving white objects to appear in brilliant colors, though stationary objects appear white. Lamps that show all objects as uncolored. Why objects appear colored. Colors produced by absorption (body color) and by selective reflection (surface color). The colors of the sky and sun-set colors. The spectrum. Absorption and emission spectra. Metals that burn. How the spectroscope tells us what the sun and stars are made of. THURSDAY, DECEMBER 30, 1926 Fluroescence substances which manufacture light of one color when illuminated by light of another color. Phosphorescence substances or storage batteries for light. Interference of light. The colors of thin films. The opal and reflection by multiple films. Chlorate of potash irridescent crystals. Stationary light waves. Lippman's color photographs. Polarized light. Two perfectly transparent substances are opaque to light in a certain position. Colors shown by crystals and minerals in polarized light. FRIDAY, DECEMBER 31, 1926 Invisible light. Infra-red rays and how they are detected. Ultra-violet light. Uses of invisible light in peace and war. Secret signalling. Experiments with the ultra-violet lamp. Fluorescence and phosphorescence under ultra-violet light. Squeezing the stored light out of phosphorescent substances by infrared rays. MEMBERSHIP DIRECTORY HONORARY MEMBERS Brigadier-General JAMES ALLEN, U. S. A. (Retired), Army and Navy Club, Washington, D. C. Colonel GEORGE L. ANDERSON, U. S. A. (Retired), Delafield, Wisconsin. Prof. SVANTE AUGUST ARRHENIUS, Nobel Institute, Stockholm, Sweden. Prof. NIELS BOHR, Institute of Theoretical Physics, University of Copenhagen, Copenhagen, Denmark. Brigadier-General JOHN J. CARTY, American Telephone and Telegraph Company, 195 Broadway, New York City, New York. Mr. THOMAS A. EDISON, Orange, New Jersey. Prof. CHARLES FABRY, Professor of Physics, University of Paris, 1 Rue Victor-Cousin, Paris (5e), France. General G. FERRIE, Inspecteur des Services de la Telegraphie Militaire et des Transmissions, 51 bis, Boulevard Latour-Maubourg, Paris, France. Prof. GEORGE FORBES, No. 11 Little College Street, Westminster, S. W., London, England. Prof. HENDRIK A. LORENTZ, Zylweg 76, Haarlem, Holland. Senator GUGLIELMO MARCÓNÍ, Royal Italian Senate, Rome, Italy. Dr. A. A. MICHELSON, Professor of Physics, University of Chicago, Chicago, Illinois. Dr. RALPH MODJESKI, 818 Widener Building, Philadelphia, Pennsylvania. Rear-Admiral JOSEPH B. MURDOCK, U. S. N. (Retired), Danbury, New Hampshire. The Hon. Sir CHARLES A. PARSONS, 6 Windsor Terrace, Newcastle-on-Tyne, England. General JOHN J. PERSHING, War Department, Washington, D. C. Mr. RALPH W. POPE, 16 Castle Hill Avenue, Great Barrington, Massachusetts. Dr. SAMUEL REA, Retired President, Pennsylvania Railroad Company, Room 215, Broad Sir ERNEST RUTHERFORD, Cavendish Professor of Experimental Physics, The University of Cambridge, Cambridge, England. Rear-Admiral WILLIAM S. SÏMS, U. S. N., General Board, Naval War College, Newport, Rhode Island. Mr. FRANK J. SPRAGUE, Consulting Engineer, President, Sprague Safety Control and Signal Hon. WILLIAM C. SPROUL, 117 South Sixteenth Street, Philadelphia, Pennsylvania. Rear-Admiral DAVID WATSON TAYLOR, U. S. N., 1813 19th Street, N. W., Washington, Sir JOSEPH J. THOMSON, Trinity College, Cambridge, England. Prof. WILLIAM CAWTHORNE UNWIN, Palace Gate Mansions, Kensington, London, England. Dr. PIETER ZEEMAN, Stadhouderskade 158, Amsterdam, Holland. CORRESPONDING MEMBERS Prof. A. S. EVE, McGill University, Montreal, Canada. Prof. JOHN SEALY TOWNSEND, New College, Oxford, England. IN MEMORIAM Mr. ISAAC B. THORN. MEMBERS ABBOTT, ROBERT R., Metallurgical Engineer, The Peerless Motor Car Company, Cleveland, Ohio. ABRAMS, PETER, 918 Chestnut Street, Philadelphia, Pennsylvania. ACHESON, Dr. EDWARD G., Manufacturer, Acheson Corporation, 689 Fifth Avenue, New York City, New York. ADAMS, BENJAMIN FRANKLIN, Vice-President, Charles F. Adams, 218-224 North Water Street, and for mail, 948 Buchanan Avenue, Lancaster, Pennsylvania. ADAMS, Dr. EDWIN P., Professor of Physics, Princeton University, and for mail, 12 Nassau Street, Princeton, New Jersey. ADAMS, MERRITT H., Woodlawn Terrace, Beechhurst, Long Island. ADAMS, WILLIAM, Jr., Electric Furnace Department, The Ajax Metal Company, Frankford Avenue and Richmond Street, Philadelphia, Pennsylvania. ADDICKS, WALTER R., President, Consolidated Gas Company of New York, 130 East 15th Street, New York City, New York. ADSIT, CHARLES G., Engineer, 555 Electric and Gas Building, Atlanta, Georgia. AIKEN, FRANK, 401 Ábbottsford Road, Philadelphia, Pennsylvania. AKIMOFF, NICHOLAS W., Mechanical and Hydraulic Engineer, 1013 Harrison Building, Philadelphia, Pennsylvania. ALBRECHT, A. C., Vice-President, North Bros. Manufacturing Company, Lehigh Avenue and American Street, Philadelphia, Pennsylvania. ALBRECHT, HERMAN C., Manager Purchasing, Stores and Transportation, Philadelphia ALLAN, ANDREW, Jr., Manufacturer of Bearing Metals, Harrison, New Jersey. ALLEN, ARTHUR HARTMAN, Jr., Inventor, Victor Talking Machine Company, Camden, ALLEN, HENRY B., Metallurgical Engineer, 8112 St. Martin's Lane, Chestnut Hill, Philadelphia, Pennsylvania. ALLEN, JAMES, Brigadier-General, U. S. A., Army and Navy Club, Washington, D. C. ALLEN, WILLIAM N., Retired Chemical Manufacturer, 557 Church Lane, Germantown, Philadelphia, Pennsylvania. ALSBERG, Dr. CARL L., Stanford University, California. AMES, Dr. JOSEPH S., Director, Physical Laboratory, The Johns Hopkins University, Baltimore, Maryland. ANDERSEN, OLAF, Geologist, Norges Geologiske Undersoliske, Kronprinsensgt 2, Oslo, Norway. ANDERSEN, ROBERT, Teacher, The Episcopal Academy, Overbrook, and for mail, 35 West LaCrosse Avenue, Lansdowne, Pennsylvania. ANDERSON, CYRUS, Patent Lawyer, (Attorney-at-Law), 519 Land Title Building, Philadelphia, and for mail, 440 Haverford Road, Narberth, Pennsylvania. ANDERSON, FRANK, Mining Engineer, 1172 Harvard Avenue, Salt Lake City, Utah. ANDERSON, Dr. ROBERT J., 2448 Beekman Street, Cincinnati, Ohio. ANDREAU, ROLAND L., Consulting Chemical Engineer and Research Chemist, Laurel Springs, New Jersey. ANDREWS, W. S., Consulting Electrical Engineer, General Electric Company, Schenectady, New York. ANDRUS, LUCIUS B., Guaranty Building, Indianapolis, Indiana. ARCHBALD, SARA T., Professor of Physics and Chemistry, Rosemont College, Rosemont, Pennsylvania. ARMSTRONG, WILLIAM R., Clerk, Powers-Weightman-Rosengarten Company, Philadelphia, Pennsylvania. ARNOLD, Dr. H. D., Director of Research, Engineering Department, Western Electric Company, New York City, New York. ARNSTEIN, HENRY, Consulting Engineer, 191 East Roosevelt Boulevard, Philadelphia Pennsylvania. ARNY, Dr. H. V., Teacher and Chemist, 115 West 68th Street, New York City, New York. ARRHENIUS, SVANTE AUGUST, Physicist, Nobel Institute, Stockholm, Sweden. ASHBROOK, Dr. DONALD S., Chemist, 2404 Willard Street, Wilmington, Delaware. ASHHURST, JOHN, Librarian, The Free Library of Philadelphia, Logan Square, Philadelphia, Pennsylvania. ASHWORTH, HAROLD, 4925 Pulaski Avenue, Philadelphia, Pennsylvania. ATKINSON, ROBERT, Hampton Institute, Virginia. ATLEE, JOSHUA W., Naval Architect, William Cramp and Son's Ship and Engine Building Company, and for mail, Riverton, New Jersey. ATLEE, WALTER, Civil Engineer, 6 West Read Street, Baltimore, Maryland. ATTERBURY, W. W., Brigadier-General, President, Pennsylvania Railroad Company, Broad Street Station, Philadelphia, Pennsylvania. ATWATER, RICHARD M., Jr., Consulting Mining Engineer, Scarsdale, New York. AUSTIN, Dr. LOUIS W., Bureau of Standards, Washington, D. C. AUSTIN, W. L., Vice-Chairman of the Board, The Baldwin Locomotive Works, 500 North Broad Street, Philadelphia, Pennsylvania. AYRES, EUGENE E., Jr., Chemical Engineer, Sharples Specialty Company, 23rd and Westmoreland Streets, Philadelphia, Pennsylvania. BABCOCK, A. F., Engineering Assistant, Traffic Department, Eastern Area, Bell Telephone Company, 1631 Arch Street, Philadelphia, Pennsylvania. BACON, Dr. RAYMOND FOSS, Chemical Engineer, Chemists Building, 50 East 41st Street, New York City, New York. BADENHAUSEN, CARL W., Mechanical Engineer, Short Hills, New Jersey. BAEKELAND, Dr. L. H., Research Chemist, Snug Rock, Harmony Park, Yonkers-on-Hudson, BAKER, GEORGE FALES, Physician, 403 Lafayette Building, Philadelphia, Pennsylvania. BALLARD, R. H., Vice-President and Assistant General Manager, Southern California Edison Company, Edison Building, Los Angeles, California. BALLENTINE, WILLIAM I., Vice-President, Advance Rumely Company, La Porte, Indiana. BALLS, WILLIAM H., South Philadelphia High School, Broad and Jackson Streets, Philadelphia, Pennsylvania. BANCROFT, JOHN, Manufacturer, Wilmington, Delaware. 135 BANCROFT, JOSEPH, Vice-President and Treasurer, Joseph Bancroft and Sons, Wilmington, Delaware. BANNISTER, J. C., University Club, 76 East Monroe Street, Chicago, Illinois. BANTA, CLIFFORD, Chief Chemist, Barrett Company, Margaret and Bermuda Streets, BARDO, CLINTON L., Vice-President, American Brown Boveri Electric Corporation, P. O. BARNES, JAMES, Professor of Physics, Bryn Mawr College, Bryn Mawr, Pennsylvania. BARNES, JOHN HAMPTON, Attorney-at-Law, Morris Building, 1421 Chestnut Street, Philadelphia, Pennsylvania. BARNETT, EDWIN S., Wheat Starch Manufacturer, 7011 Cresheim Road, Mount Airy, Philadelphia, Pennsylvania. BARNHART, G. EDWARD, Aeronautical Engineer, 1547 East Walnut Avenue, Pasadena, California. BARR, Major JOHN H., Mechanical Engineer, The Barr-Morse Corporation, Ithaca, New York. BARRINGER, DANIEL MOREAU, Geologist and Mining Engineer, 1242 Real Estate Trust Building, Philadelphia, Pennsylvania. BARTH, CARL G., Consulting Engineer, 424 Whitney Avenue, New Haven, Connecticut. BARTOW, EDWARD, Chemistry Department, State University of Iowa, Iowa City, Iowa. BASSETT, WILLIAM H., Technical Superintendent, American Brass Company, Waterbury, Connecticut, and for mail, Cheshire, Connecticut. BATES, C. W., Electrical Engineer, Philadelphia Electric Company, and for mail, 403 North Narberth Avenue, Narberth, Pennsylvania. BATES, E. F., 248 Sheldon Street, Philadelphia, Pennsylvania. BATES, ONWARD, Civil Engineer, 934 John's Road, Augusta, Georgia. BAUER, PAUL SHERMAN, Student, Cruft Laboratory, Harvard University, Cambridge, Massachusetts. BAZZONI, Dr. CHARLES BLIZARD, Professor of Experimental Physics, Randal Morgan Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania. BEACH, CHARLES S., Designer and Machinest, 753 Main Street, Bennington, Vermont. BEALE, HORACE A., Jr., President, Parkesburg Iron Company, Parkesburg, Pennsylvania. BEALE, LEONARD T., Secretary, John T. Lewis and Brother Company, 705 Lafayette Building, Philadelphia, Pennsylvania. BEATH, E. R., Lapidist and Jeweler, 129 South 12th Street, Philadelphia, Pennsylvania. BECK, M. A., Vice-President and Chief Engineer, Milwaukee Electric Crane and Manufacturing Company, 294 Greenbush Street, Milwaukee, Wisconsin. BECKER, IRWIN A., Pharmacist, in care of Michael Reese Hospital, 2839 Ellis Avenue, Chicago, Illinois. BEHR, LEO, Research Engineer, Leeds and Northrup Company, 4901 Stenton Avenue, Philadelphia, Pennsylvania. BELFIELD, T. BROOM, Manufacturer, 1905 Spring Garden Street, Philadelphia, Pennsylvania. BELL, JOSEPH PERCY, Mechanical Engineer, 30th and Race Streets, Philadelphia, Pennsylvania, and for mail, 230 North Monroe Street, Media, Pennsylvania. BELL, J. SNOWDEN, Attorney-at-Law, Box 629, City Hall Station, New York City, New York. BEMENT, A. C., Bell Telephone Company, 1835 Arch Street, Philadelphia, Pennsylvania. BEMENT, WILLIAM P. (Retired), 743 Real Estate Trust Building, Philadelphia, Penn sylvania. BENNETT, C. E., Electrical Engineer, Georgia Railway and Power Company, Atlanta, Georgia. BENNETT, JOSEPH S., Jr., 6310 Woodbine Avenue, Overbrook, Pennsylvania. BENZON, GEORGE H., Jr., Vice-President, Wm. Sellers & Company, Mechanical Engineer, 252 Mather Road, Jenkintown, Pennsylvania. BERG, ERNST J., Professor of Electrical Engineering, Union College, Schenectady, New York. BERG, HOLGER V., Chemical Engineer, Newport, Delaware. BERG, P. ESKIL, Electrical Engineer, General Electric Company, Schenectady, New York, and for mail, 14 Lowell Road, Schenectady, New York. BERLINER, EMILE, Engineer, 1458 Columbia Road, Washington, D. C. BERLINER, HERBERT S., Engineer, Compo Company, Limited, 131 18th Avenue, Lachine, Canada. BERRESFORD, A. W., care of Nizer Corporation, 7424 Mackie Street, Detroit, Michigan. BIDDLE, CHARLES M., Jr., Riverton, New Jersey. BIDDLE, ELIZABETH C., 400 South 15th Street, Philadelphia, Pennsylvania. BIDDLE, JAMES C., Jr., Abbey of Gethsemani, Trappist Post Office, Kentucky. BIDDLE, JAMES G., Importer of Scientific Apparatus, Wallingford, Pennsylvania. BIDDLE, ROBERT, President, Biddle-Gaumer Company, 3846-3856 Lancaster Avenue, Philadelphia, Pennsylvania. BIERBAUM, CHRISTOPHER H., Consulting Engineer, 113 Parkside Avenue, Buffalo, New York. BIGELOW, S. LAWRENCE, Professor of General and Physical Chemistry, University of Michigan, Ann Arbor, Michigan. BILGRAM, HUGO, Machinist, 1235 Spring Garden Street, Philadelphia, Pennsylvania. Illinois. BILYEU, THOMAS, Mechanical Engineer, 697 East Broadway Street, Portland, Oregon. |