Mr. Reuel Stratton, Supervising Chemical Engineer for the Travelers Insurance Company, made a presentation on May 12, 1932 at the Pennsylvania Safety Conference in Harribsurg, entitled “The Engineering Control of Occupational Diseases by Plant Equipment and Operation.”
Mr. Stratton noted at the outset of his speech that:
“The study to control the incidence of occupational or industrial disease by engineering is not at all new. As early as 76 A.D., Pliny recorded the fact that ‘Those employed in the works preparing vermilion cover their faces with a bladder skin, so that they may not inhale pernicious powder, yet they can see through the skin.’”
Further Mr. Stratton said:
“Undoubtedly, certain occupational diseases need not occur. The medical and engineering aspects of their control are now so well known that in the hands of capable plant officials there can be little excuse for occurrence. There are others, however, where a certain percentage of cases is to be expected, despite the utmost efforts of the plant physician and the engineer.”
Mr. Stratton spoke at length on dust diseases:
“While the term “pneumoconiosis” is applied to any respiratory disease caused through the inhalation of dust, the most common type of it in industry is “silicosis,” or silica poisoning. As the engineering control of silicosis embraces the essentials required, any suggested procedure will be understood to apply to all types of pneumoconiosis, the only difference being in the severity of the disease, the length of exposure required to produce it, and the free silica content of the material being processed or handled. In any study of plant operation producing such a disease the fundamental cause is the inhalation of dust, so that the problem is to control the production of dust, or to protect the workers against the inhalation of the dust.”
“Silica poisoning, or silicosis, has long been associated with quarrying and stone-cutting operations. Other dusts such as alumina, iron oxide, and asbestos should be regarded with suspicion.”
Two of the Engineering controls for dust mentioned in the speech are:
Housing: “Where practicable, dusty manufacturing processes should be separately housed and isolated, and every effort should be made to arrest dust at its source, to protect the employees… The location of a dusty operation in the open air does not eliminate its danger; in fact, it may increase the number affected.”
And
Ventilation: “Proper ventilation is of paramount importance in the control of any dust exposure. Each process should be studied separately and ventilated separately. It is not wise to rely upon general ventilation. Instead, high-velocity ventilation apparatus should be installed, functioning directly at the source of the dust.”