 |
| ALTITUDE CLASSIFICATION TEST. Making
electrocardiograms during test. Official photograph, U.S. Army. |
 |
| THE RUGGLES ORIENTATOR in which the candidate is whirled and tested. William Guy Ruggles, the inventor, is sitting at the lower right. |
The old question of why sound sometimes travels much farther than at other times may be answered as a result of experiments soon to be made in England, when the firing of big guns will be broadcast by radio from the artillery proving grounds at Shoeburyness. People for miles around will have the opportunity of hearing the guns by radio, and then, several minutes later, of hearing the actual sounds as they travel through the air.
The automobile is faced with the charge of being an indirect cause of cancer. Dr. Chevalier Jackson, well-known bronchoscopist of Philadelphia, is inclined to believe that the inhalation of gasoline fumes and small particles of tar in the air may be implicated in the surprising increase in cancers of the lungs that has taken place in the last 10 to 15 years.
TimeLine Archives
