W. B. No. 208. U. S. DEPARTMENT OF AGRICULTURE, BULLETIN F. VERTICAL GRADIENTS OF TEMPERATURE, HUMIDITY, AND WIND DIRECTION. A PRELIMINARY REPORT ON THE KITE PREPARED UNDER DIRECTION OF WILLIS L. MOORE, CHIEF U. S. WEATHER BUREAU, GIFT Supt. of Documents MAY 2 T551.5 f Hon. JAMES WILSON, LETTER OF TRANSMITTAL. Approved: Secretary of Agriculture. SIR: I have the honor to transmit for publication, herewith, a paper on Vertical Gradients of Temperature, Humidity, and Wind Direction, being a preliminary report on the kite observations of the year 1898, by Dr. H. C. Frankenfield, forecast official. Dr. Frankenfield states that in the preparation of this paper he has freely consulted with Professors Abbe, Bigelow, and Marvin, of this Bureau. An introductory chapter on the Kite Meteorograph, Construction, and Operation is added by Prof. C. F. Marvin. This report discusses probably the largest amount of free-air meteorological observations ever taken within a like space of time over so great an area, and I believe will be found to have added something to the general knowledge of temperature and hygrometric conditions of the lower levels of the air. Very respectfully, JAMES WILSON, U. S. DEPARTMENT OF AGRICULTURE, WEATHER BUREAU, OFFICE OF THE CHIEF, Washington, D. C. Secretary of Agriculture. 405921 WILLIS L. MOORE, Chief United States Weather Bureau. 3 |