Engines of of- of Death eath No 14 in m a series of 0 the old and new in iw war rear I I i J i I I k kI C H ct k- k k S I i i t tt t 4 p it 4 i k S. S I 7 4 I J t 3 5 t S S. S S 5 r L i 5 V i r- r 4 S S 'S 1 1 S S S 44 a 4 x 4 5 Finding the range of a aloe foe p plane ane in inthe the the 1918 way 2 k 4 4 4 Ss S s W S St t The modern way vay of detecting the approach of an enem enemy I air fighter The automatic brain and the automatic hand have made antiaircraft antiaircraft antiaircraft anti anti- I aircraft batteries many times more deadly against raiding planes than was the case in the World war Before the coming of the modern director a waste period of 10 seconds seconds sec see or more elapsed between findIng find find- Ing ng the range and firing the gun gunas gunas gunas as directions were phoned down to to- the gunners Under the modern method this dead time is virtually eliminated The pictures show an old type of range finder inder the I being used b by U U. S. S troops in the Ardennes in 1918 contrasting with the late type of Vickers instrument being operated b by a U. U S. S coast artillery artillery ar ar- ar- ar tillery unit A system of dead deadly accuracy Is that employed toda today against foe aircraft a marvel of oC scientific det de de- de- de t tense nse First the sound locator detects the approach of ot the enemy as far as 25 miles mUes away simply by tuning I In on its motors Connected with the tho locator by an electrical transmIssion transmission transmission trans trans- mission system are the searchlights which automatically are turned to toward toward toward to- to ward the target Then the directors get busy The They compute the speed of the oncoming enemy the angle angJe of oC approach the range tallying with future position position tion and correct all aU this with regard to to drift wind temperature etc I In two or three seconds the gunners gunners gun gun- gun I ners have all this information and I go 50 In into to action Lucky indeed is the invader who escapes their deadly fire In almost no other department of offense or defense has the scientific scientific scientific advance been greater than in antiaircraft gunnery