85 



SUBJECT INDEX 



Eight-oared shell, design and propulsion of, 



model , 117 

 Elastic shells, theory of, 6o6 

 Elastic stability, of tee stiffeners, 4-57 

 Elastic structures, impact on, 48l 



static loads in, 507 

 Elastically supported ring, experiments 

 with, 704 

 frequency equation for, 70U 

 Elasticity, measurement of, on WOLF, full- 

 scale, T-U5 

 modulus of, of materials for periscope 

 tubes, R-1 6 

 of steel from PRESTON {DD327), full- 

 scale, 318 

 of box girders, 4Ul 

 of ships, full-scale, 297; T-2 



model, 298 

 theory of, 291 



in shipbuilding, T-2 

 Elaterlte, frictional resistance of, 1U 

 Electric power supply system, 561 

 Electric sparks, brilliance and duration of, T-1 6l 

 Electrical analogy, use of, in solving hydro- 

 dynamic problems, T-225 

 use of in solving vibration problems, 

 551 ; R-226 

 Electrical engine -pressure -indicating device, 559 

 Electrical insulators, rigging, tensile tests 



of, 587 

 Electrographic oscillograph, T-151 

 Electrography, T-1 67 

 Electromagnetic damping apparatus, 269 

 Electromagnetic distant -reading apparatus, 3'^-0 

 Electronic circuit,, for condenser-type pressure 

 gage, 625 

 for diaphragm-type low-pressure gage, 665 

 Electronic methods of observation, R-51 , Ti-5^, 



R-62, R-78, R-79, R-86, R-201 , R-214 

 Electronic regulation, of d-c power supply, 526 

 Electronic transmitter, for underwater sound, 659 

 Electronic voltage regulator, U83, 502; R-51 , R-62 

 Elin-Hafergut method of welding, T-1 87 

 Ellipsoid, elastic deformation of, 606 

 ELLYSON (DDlJ-54) , gunf iring trials on, full- 

 scale, R-57 

 Emergency cargo vessel. See cargo vessel. 

 Enemy minesweeper EMS-1 , full-scale trials with 

 Voith-Schnelder propellers, 6I19 



Energy absorption, of circular plate, R-202 

 Energy-compression curves, for copper balls, R-2U0 

 Engine, marine, stopping and reversing, T-106 

 Engine. See also specific kind of engine. 

 Engine-pressure-lndlcating device, electrical, 55'-' 

 Entralnment of frequency, 558 



Entropy diagrams, internal-combustion engines, T-9'+ 

 Equations, methods of solution of, T-77 



polynomial, method for calculation of roots of, 

 568 



polynomial of sixth degree, for bodies of revolu- 

 tion, 719 

 Erosion, bibliography, T-1 88 



by cavitation, T-1 33, T-1 88 



See also Corrosion. 

 Errors in calculated stresses, determination of, 



600 

 European diary, of Capt. H.E. Saunders, R-365 

 European method of testing self-propelled models, 



T-1 27 

 European model basins. See Model basins, European. 

 Everdur brazing, for welding models, R-3'+7, R-348 

 Excitation, parametric, 558 

 Explosions, damage by, analysis of, R-296 



detonating blast-type, T-1 68 



effect of, on freely suspended target, R-27Q 



internal pressures created by, in tubes, T-226 



recording of, by high-speed photography, R-39; 

 T-1 21 



tests of, on hatch seal locks, T-1 91 



See also Underwater explosions. 

 Explosive load, behavior of steel diaphragm-s- under, 

 R-66 



resistance of steel to, R-30 

 Explosives, primers, T-49 

 Extensometers. See Strain gage. 

 External pressure, on cylindrical tubes, 30Q [T-5] 



on unfired pressure vessels, 329, 356, 387 

 "E" Boat, German, apparent slip and tactical 

 diameters of, full-scale, 628 



Failure, of medium steel, R-207 

 Falling body, stability of, R-U2 

 FARRAGUT {DD348) , rudder tests for, full-scale and 

 model, 397 

 turning movements of, full-scale and model, 336, 



397 

 Fathometer, catamaran float arrangement for towing, 

 R-340 



