Indianapolis Times, Indianapolis, Marion County, 14 March 1941 — Page 19

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PAGE 19

SAVINGS EVENT!

INDIANAPOLIS TIMES

THIS SPECTACULAR

FRIDAY, MARCH 14, 1041

HOW TO DETECT RAIDER IS VITAL

Warning in Time Necessary To Co-ordinate Fire of Anti-Aircraft Units.

By MAJOR AL WILLIAMS

Times Aviation Editor The vit Wu detect

al problem in this war is] the approach of enemy

air raiders and spread the warn Ing In time to offset air 250 miles an upward and to |

{ nate the fire of anti-aircraft

hour co-ordi batteries and interceptor squaarons For this purpose former fishing trawlers, stationed in the] North Sea, are] equipped with sound detectors and radio trans- | These ships are senthe sea ramparts around | Britain, The Germans consider these jittle sentries more important than major warships. Their detectors pick up sound waves from the exhausts and propellers overhead. Each can lo- | cate general direction. Readings | from many trawlers indicate fairly accurately the speed. altitude and course of the air raiders, and this data is flashed over the anti-air- | craft and interceptor squadron net- | work, | Sound travels second In zero Rarified air at aitit perature variations, change this speed. With planes traveling 250 miles an hour approximately 365 | feet a second), and sound traveling | about 1000 feet a second, the sound | detectors are always trailing the} planes that produce the sound. For this * “lag” ingenious minds have established correction factors. Raider Can Resort fo Tricks Consider a night attack where vision is zero without searchlights. To complicate the sound problem for the defense, a clever raider pilot in a twin-engined job offsets his] engines—runs each at a different | speed. Twin-engined bombers can | thus be made to sound like a lot | of single-engined planes. The raider | also can resort to another baffling | trick of holding altitude and chang- |

mitters

ries on

Maj. Williams

about 1080 feet a | weather dry air, | udes, and tem-

ing speed by alternately closing and | opening engine throttles. | The sound data, such as it is, is| information available and | be used. |

the only SO Must that the searcilights follow thea

When it indicates | raiders are within range, electrically geared to sound detectors try to . pick out the enemy overhead. Also | meshed and geared to lights and | : detectors are the anti-aireraft guns

Problem Complex

the problem is compiex system must be |

T'hus far ouzh, but to this tied the interceptor plane opera- | tions. The zones of atmosphere | cover ed by volume of gunfire must | so that defense planes | can operat e against the raiders, and | the interceptor pilots must know | these zone limitations. If there's | a slip up, anti-aircraft gunfire may | destroy friendly planes. | Then the searchlights must be to detach themselves from » anti-aircraft batteries and coordinate with the interceptors. Too mucin illumination is as baffling to he friendly interceptor pilot overhead as too little. Add to the time interval problems the fact that about 30 seconds must elapse between the searchlight illumination of a plane target and the firing of the guns—due largely to computation of sound and searechlight data—and you have a glimpse of the engineering enigma of antiaircraft defense after dark.

2 HELD IN THEFT OF 13 WPA CHECKS

SOUTH BEND, Ind., March 14 (U. P.).—Two northern Indiana men were held here today in connection with the theft of 13 WPA checks amounting to $255 from mail boxes In Mishawaka and Elkhart. The checks allegedly were taken over a period of four months. Held! were Otto Cooper Jr, 21, Misha-| waka, and Milton W, Crabtree, 33.1 Elkhart. Bot hare former WPA employees, They were arraigned on Federal charges before U. S. Commissioner Thad Talcott Jr. yesterday and dodged in St. Joseph County jail under 32000 bond. They will await disposition in the northern U. S.| District Cour

FEROS AUTOPSY ON AGED MUMMY

* NEW YORK (U.P) »Egyptian nobleman, has zjected to an autopsy 4000 years safter his death to determine, not the cause of his demise, but the manner of his mummification, The operation, performed by Dr. Harry L. Shapiro of the American sMuseum of Natural History, dis«closed that Wah, of the 11th Dynasty Wahs, died wheh he was 30 vears old. Well preserved despite the fact that he died in the year 2010 B. C., Wah was 5 feet 2 inches tall and, judging by the care taken by his embalmers, a person of importance in his community.

CHURCHGOER HOLDS A PERFECT RECORD

BROOKVILLE, Pa. (U. P.).—The four-mile walk 80-year-old E. A. "Wedding takes each Sunday is more nan so much exercise—it keeps in--lact his 25-year perfect record for Sunday school attendance. Through snow, cold, rain and sunshine since January, 1915, Wadding has trudged four miles to and from St. Matthews Lutheran Church al nearby Ramsaytown, never missing a Sunday, and piling up more than 5000 shoeleather miles.

reaqyv

Wah, an been sub-

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