1890 Patent No. 16,702 controlling air moving belts, Archibald James Robertson

Patent No. 16,702 A.D.1890 Improvements in Means for Controlling the Air about Moving Belts and Machinery<

"I, Archibald James Robertson of 2007 Opera House Block, Chicago, Illinois, United States of America, Mechanical Engineer, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement: This invetion relates to means for controlling the air about moving belts and machinery.  It is illusted in the drawings..."

2 pages of text + 1 drawing which have been disbound from a larger volume.

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