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November 29, 1943. 

Dean T. Sayville 
New York University 
The Bronx, New York, New York. 

Dear Sir; 

Thank you very kindly for your interest in my idea regarding; A mechanical apparatus for the study of meteorological phenomena, particularly as related to the pilot and the operation of his aircraft. 

The present method of teaching the science of meteorology is mostly theory with little or no laboratory work. Therefore briefly, let me sum up my idea of a "Weather Maker" for practical demonstrations. This " Weather Maker" is to consist of a box approximately ten feet long by five feet high and any where from one foot to three or more feet wide. The box should have double thickness of glass on one or more sides. The other sides may be constructed of wood,etc. This box should be fully enclosed. The operating mechanism consisting of blowers, water tanks, ice making machinery, apparatus for heating air,etc. all should be housed underneath the box so that the whole machine can be portable if necessary. Inside the box we should have in the center on a supporting column a model airplane. This airplane should be movable in a vertical plane. It should be made of a material that is a good conductor of heat. This model should be hollow, and we should be able to, thru pipes leading to it , from its supporting column, pump either a freezing or heating liquid in order to change the temperature of our model at will. At one end of the " Weather Maker " we will have louvers with a means of transmitting either warm or cold air, or both throughout a temperature range above and below 32 degrees Fahrenheit ( freezing ) as shall be determined to be adequate for our purposes. We will also have a means of interjecting water in varying degrees of intensity from water vapor to heavy rain showers. We should be able to control the temperature of the water from above freezing to near freezing. We will have thermometers at different points thrughout the box so we can maintain any temperature. With this"Weather Maker" it should be possible to manufacture a good deal of weather phenomena. We should be able to show warm overrunning air with cold air below and perhaps a cloud deck in between, The cloud deck having a dangerous iceing condition. The model airplane with that sort of a condition would then be able to fly in the cloud deck, pick up a dangerous load of ice, and then ascend a little higher into the warm air and get rid of the ice accumulation. There are innumerable combinations of this condition.

After this  "Weather Maker " is constructed, we will have an unlimited range for expermintation. We may be able to produce turbulence due to either unstable air or because of a strong gradient over mountainous terrain. We might even produce thunderstorms with that unstable condition. Formation of different types of fog could be shown. Perhaps we could simulate rain and snow static on our model airplane and in that way attempt to improve radio communications. With sufficent experimentation we might be able to duplicate any weather condition we desire.