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The preceding papers of this Symposium have shown that weather is composed of many separate factors such as light, temperature, and moisture. They have shown that although these weather factors show cyclical rhythm, the factors are subject to wide variation with time and place. These papers have also shown that materials exposed to the weather change usually for the worse and that the rates of change vary as the intensity of the weather factors vary. For most materials the changes brought about by exposure to the weather proceed slowly. The impatient laboratory worker is unwilling to await the outcome of normal weather exposure tests and has displayed great energy and ingenuity in the development of means of bringing weather into the laboratory and speeding up the changes weathering causes. The purpose of this paper is to discuss these efforts. One may assume that the cyclical behavior of weather was recognized long before man recognized the effect of weather on materials, but it seems safe to assume that both recognitions antedate written records. I have made no attempt to pursue this line of thought or to develop any history of early efforts to speed up and to control the process.
Sawyer, Roscoe H.
Manager, Devoe and Raynolds Co., Inc., Louisville, Ky.