OCR Text |
Show AIRPLANE COMPASSES. Of the thousands of inventions relating to the war which have been tiled in the patent offices of the Vnitod Slates and the countries of the entente allies in the last three years many have been for compasses for airplanes. The points aimed at particularly par-ticularly have lieen the elimination of errors that result from tilling and banking. The problems a re complex and have been studied for years, as the troubles worried users i" compasses long before airplanes came into t; world. The military vaine of a perfect compass for an airolane wouM o great. Willi sm-h an invention lliafis (Mi cloudy night would be coin in rat ivcly sate and ;ii,-!irs could reach predeti nniiied ob-.1- olives v. iihom emcii regard to land bearings. At I'Vcm lit. when he cannot '.v hmd or e;y ! hi ng else, the siinmwi pntflinilly has to feel his way to a large extent. |