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1919-01-01
Technical Paper
190048
E H COLPITTS
In a rapid and illuminating sketch of the early work done in electricity and magnetism the subtle and close connection between pure research and so-called industrial research is shown. Building on the work of Faraday, Maxwell and Hertz, Marconi, in our day, had the confidence to do the practical thing. From the Hertz oscillating system he passed to grounded antennas at both sending and receiving stations. From the well-understood tuning of electrical circuits and the coherer of Professor Branly he secured increased efficiency and selectivity. Mr. Edison, following the early work of J. J. Thomson at Cambridge University, England, devised the first practical application of the electron apparatus, the Edison relay. The vacuum tube became in the radio field an amplifier, an oscillator and a modulator, the audion. In addition to these interesting developments are the Poulsen arc, the Alexanderson alternator and other alternators of German design.
1918-01-01
Technical Paper
180022
J G ZIMMERMAN
1917-01-01
Technical Paper
170007
ELMER A. SPERRY
The author calls attention to the unreliability of the magnetic compass when used for aerial navigation and to the possible development of the gyroscopic compass for this purpose. He then explains how the drift of an airplane in flight makes it difficult to follow with accuracy a given course devoid of landmarks, unless an accurate drift indicator using the principle of the stroboscope is available. The development of such an instrument is then described, as are also means for synchronizing it with the compass. The use of the automatic synchronized instrument in flight over land is outlined, and its application to flight over water is described in considerable detail. Rules for aerial navigation over water, observation as to movement of wave crest and determination of wind velocity and direction are considered in their relation to the use of the instrument.
1917-01-01
Technical Paper
170053
H. E. RICE
The author discusses in this paper a few of the problems involved in the design of ignition equipment. Some of these problems have been solved and some remain to be solved. The early history of the development of ignition apparatus is traced, reference being made to the vibrating coil type of ignition operated by dry cells or storage batteries, various types of magneto and dual-magneto systems, and combined generator and storage battery systems. The balance of the paper refers more particularly to batteries and ignition proper. The two types of battery ignition, open-circuit and closed-circuit, are described and the current characteristics of each are shown graphically by means of curves. Some of the problems encountered in the development of present battery systems are next considered and such topics as reduction of inertia in the contact-arm, overcoming harmonic vibration, advantages of one-piece cams and the function and design of the condenser are treated in detail.
1917-01-01
Technical Paper
170051
Burns Dick
1917-01-01
Technical Paper
170050
J. A. WILLIAMS
This paper discusses the principles of battery ignition and then describes high-tension magneto ignition. A comparison between the two types of ignition is given, and the paper concludes by illustrating diagrammatically how and why a very hot spark causes the engine to produce more power and to economize on fuel consumption.
1916-01-01
Technical Paper
160005
ALEXANDER CHURCHWARD
1916-01-01
Technical Paper
160006
FRANCIS R. HOYT
1916-01-01
Technical Paper
160002
JOSEPH BIJUR
1916-01-01
Technical Paper
160004
FRANK CONRAD
1915-01-01
Technical Paper
150042
T. H. SCHOEPF
1914-01-01
Technical Paper
140004
W. H. CONANT
1914-01-01
Technical Paper
140034
ALBION D. LIBBY
1913-01-01
Technical Paper
130020
J. W. Fitzgerald
1913-01-01
Technical Paper
130015
C. C. MUNSON
1912-01-01
Technical Paper
120008
J. W. FITZGERALD
1912-01-01
Technical Paper
120033
C. F. Kettering
1912-01-01
Technical Paper
120036
LEONARD KEBLER
1911-01-01
Technical Paper
110019
A. J. DOTY
1911-01-01
Technical Paper
110020
R. C. Lanphier
1909-01-01
Technical Paper
090005
S. W. RUSHMORE, HERBERT L. TOWLE
1909-01-01
Technical Paper
090010
H. M. BECK
1909-01-01
Technical Paper
090009
EDWARD SOKAL
1908-01-01
Technical Paper
080005
J. O. HEINZE
1908-01-01
Technical Paper
080011
BRUCE FORD
1908-01-01
Technical Paper
080014
H. VANDERBEEK
Viewing 16531 to 16558 of 16558