摘要:

A theoretical analysis has been made of the effect of gradient, wind, and combinations thereof, on the take-off and landing of aeroplanes. Formulas and charts are given which permit the determination of the length of the ground run for any given conditions providing that the performance on a level surface in still air is known.The effect of wind and current on the take-off of seaplanes has also been investigated. Formulas and charts have been derived for the determination of take-off time and distance under any given conditions from a knowledge of the take-off speed, time, and distance in still air and still water. This analysis indicates that in the take-off of seaplanes the wind is in general of more importance than the current, and, in consequence, take-off should always be carried out upwind.

ISSN:1923-4287    

DOI:10.1139/cjr38a-001

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

From the viewpoint of the spectroscopic analyst, it is desirable to obtain some knowledge concerning the phenomena that result in the emission of radiation from certain types of sources. Results of intensity measurements on the vibration bands of the violet cyanogen system, and on certain lines in the tin spectrum, indicate that in the condensed d-c. and a-c. spark discharges the excitation is predominantly thermal in character, just as in the freely burning carbon arc. The values for the maximum temperature in the discharge columns of these three sources were found to be very nearly 9500°, 7800°, and 7000° K., respectively. It was observed, however, that the Boltzmann character of the distribution over various energy states was lost when the usual inductance was removed from the d-c. spark circuit.One of the five investigated tin levels exhibited an abnormal behavior, which may possibly be accounted for by the occurrence of collisions of the second kind. There is also evidence to show that the emitting column is surrounded by a relatively cold layer of atoms originating in the material placed on the electrode. This layer absorbs some of the intensity of the lines ending on the ground level.

ISSN:1923-4287    

DOI:10.1139/cjr38a-002

出版商:NRC Research Press    

年代:1938

数据来源: NRC