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Standard atmosphere

Description: This report was prepared at the request of the National Advisory Committee for Aeronautics and discusses the need of a standard set of values of pressure, temperature and density at various altitudes and points out the desirability of adopting such values as are most in accord with actual average conditions, in order that corrections in individual cases may be as small as possible. To meet this need, so far as the united states is concerned, all free-air observations obtained by means of kites and balloons at several stations in this country near latitude 40 degrees N., have been used, and average values of pressure, temperature, and density, based upon those observations, have been determined for summer, winter, and the year, and for all altitudes up to 20,000 meters (65,000 feet). These values are presented in tables and graphs in both metric and english units; and in the tables of densities there are also included values of density for other parts of the world, more particularly for Europe. A comparison with these values shows that, except in the lowest levels, the agreement is very satisfactory.
Date: January 1, 1923
Creator: Gregg, Willis Ray
Partner: UNT Libraries Government Documents Department

Meteorological conditions along airways

Description: This report is an attempt to show the kind of meteorological information that is needed, and is in part available, for the purpose of determining operating conditions along airways. In general, the same factors affect these operating conditions along all airways though in varying degree, depending upon their topographic, geographic, and other characteristics; but in order to bring out as clearly as possible the nature of the data available, a specific example is taken, that of the Chicago-Dallas airway on which regular flying begins this year (1926).
Date: January 1, 1927
Creator: Gregg, W R
Partner: UNT Libraries Government Documents Department

Frost and the Prevention of Damage by It

Description: "All frost protection methods, from the simplest to the most complicated, can be carried on more successfully if the processes by which the earth's surface cools at night and the factors which influence the rate of cooling are well understood. In the first part of this bulletin an attempt has been made to describe in a simple, elementary manner the changes that take place at and near the earth's surface on a frosty night, so that persons protecting plants or trees may be able to understand how their protective devices operate to prevent damage and in what manner they are most efficient. In treating a matter of this kind it is practically impossible to eliminate all technical terms, but so far as possible these have been carefully explained in simple language. The larger portion is given over to a discussion of the various methods and devices now being used for protection against frost, together with a chapter on temperatures injurious to plants, blossoms, and fruit." -- p. 2
Date: 1920
Creator: United States. Dept. of Agriculture.
Partner: UNT Libraries Government Documents Department

Modern Methods of Protection Against Lightning

Description: "This bulletin will give those persons interested in protection against lightning concise, practical, and up-to-date information accompanied by specifications for installing the equipment so as to secure the greatest degree of protection with the type of installation chosen.... The several sample sets of specifications, given herein, calling for rods and fittings of differing cost, will enable the prospective buyer of lightning protection to make an intelligent choice." -- p. 2
Date: 1917
Creator: Covert, Roy N.
Partner: UNT Libraries Government Documents Department