Indianapolis Times, Volume 42, Number 311, Indianapolis, Marion County, 8 May 1931 — Page 5

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AIRLINE ADOPTS GROUND ‘BLOCK' SIGNAL SYSTEM Red 'Flagging’ Posts Every 25 Miles to Warn Pilot of Hazards. By Seripp-Hou>ard Xctcspaper Alliance WASHINGTON .May 8. The Ludington line, busiest air line in the world, today adopted the block signal system of the railroads for controlling its traffic between New York and Washington. There will be five “blocks,” one every forty miles, along the 200mile airway. No plane will be permitted to fly past a red signal light. Later the blocks will be reduced to twenty miles each, with the installation of signal lights at emergency landing fields, according to Paul F. Collins, vice-president in charge of operations. With thirty planes flying north and south daily, the Ludington line found it necessary to devise a substitute for the “flagging’* system formerly used to stop ships. The line plans to remove the radio equipment from its planes, relying entirely on the block system for control of traffic. While radio is extremely valuable on most airlines, it has not been found feasible for this short and heavily traveled route. In the future the movement of every plane will be controlled by Henry Brown, assistant operations manager, from his office at Wash-ington-Hoover airport. Over the teletype system he will

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Heiress Found

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Fifteen-year-old' Dorris Louise Dempsey, above, runaway daughter of a wealthy York YPa.) lumberman, was discovered by police living in a tawdry furnished room in New York. Four of her recent companions—three men and a girl —were arrested and held for questioning.

receive weather reports from the pilots as each plane lands at one of the fields. These will be co-ordi-nated with the government’s weather reports, and Brown will know every minute exactly what the weather Is all along the 200mile airway. He will control all the signal blocks from his office, and can stop any plane along the route by setting a red light against it.

STATE DENTAL ASSOCIATION TO MEET MAY 18 Convention, Scheduled for Claypool, Will Last Three Days. Several speakers known nationally to dentists are scheduled to appear on the program of the Indiana State Dental Association convention in the Claypool, May 18-20, according to Dr. E. E. Voyles, in charge of arrangements. The association today invited every dentist in the state to attend, regardless of membership. Opening session will be devoted to clinics, when veteran and young practitioners will explain the significance of work on exhibit. Monday afternoon, Dr. Clarence O. Simpson, St. Louis, professor of radiodonita at Washington university, will lecture on "A Survey of Radiodontia Service and Methods of Improving It.” Other speakers will include Dr. Charles Lyons, University of Michigan, on “Oral Surgery;” Dr. R. H. Taylor, Indianapolis, “Cast Partial Dentures;” Dr. H. B. Morrow, Indiana university school of dentistry, “The Problems of Children’s Dentistry for the General Practitioner;” Dr. C. J. Hollister, state department of health, Harrisburg, Pa., on “Mouth Hygiene and Public Dental Health Education;” Dr. E. Vernon Hahn, Indianapolis, “Head Neuralgias and Their Treatment,” and Dr. Edward H. Bruening, Omaha, “Some •Highlights of Dental Research.”

THE INDIAN APOT.IS TIMES

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