Description: Revised edition. Report discussing the fowl tick, which commonly affects chickens but also other poultry. Topics discussed include fowl tick distribution, effects of tick attacks or infections, life cycle, and methods of combating the tick.

Description: Revised edition. Report discussing how buyers of beef cattle can determine the value of cattle offered in public sales. Topics discussed include parts of the carcass and classification systems used in judging cattle. Includes a suggested scorecard.

Description: Revised edition. "The purpose of this bulletin is to suggest methods of collecting, preparing, mounting, and preserving plant specimens of various sorts which can be used by teachers of agriculture. To instructors in agriculture who have had special training along these lines, doubtless many of the suggestions here given will seem superfluous; but there are many teachers who are called upon to teach agriculture who have not had such training, and who will doubtless welcome specific information as to how to prepare the materials needed for illustration and demonstration purposes in the classroom." -- title page

Description: Report issued by the U.S. Bureau of Mines on a survey of the New Albany oil-shale deposits in Indiana. The experimental procedures for surveying and sampling these shale deposits are presented in detail. This report includes tables, and graphs.

Description: This report deals with the calculation of the equilibrium, statistical stability, and damping of the tail plane. The author has simplified the present theory of longitudinal stability for the particular purpose of obtaining one definite coefficient characteristics of the effect of the tail plane. This coefficient is obtained by substituting certain aerodynamic characteristics and some dimensions of the airplane in a comparatively simple mathematical expression. Care has been taken to confine all aerodynamical information necessary for the calculation of the coefficient to the well-known curves representing the qualities of the wing section. This is done by making use of the present results of modern aerodynamics. All formulas and relations necessary for the calculation are contained in the paper. They give in some cases only an approximation of the real values. An example of calculation is added in order to illustrate the application of the method. The coefficient indicates not only whether the effect of the tail plane is great enough, but also whether it is not too great. It appears that the designer has to avoid a certain critical length of the fuselage, which inevitably gives rise to periodical oscillations of the airplane. The discussion also shows the way and ...