The writer recently saw in a Buffalo factory, two improvised fans attached to a large milling machine. The operator of the machine fastened on each of two rapidly rotating shaft- a piece of tinned sheet iron, forming a fan about 12 inches long and 8 inches wide. The tin plate was simply curled as closely about the shaft as possible, then tightened by means of a wooden wedge. The shafts rotate about 300 times a minute, hence the fans cause a delightfully cool breeze, which not only cools the operator, but also blows away the iron dust from his presence. Thus the operator need inhale but little of such dust.

Many thousand machine tenders in the land might profit by imitating this truly simple, useful, and cheap device. The fan dues not cost three cents.