Evening Republican, Volume 22, Number 93, Rensselaer, Jasper County, 21 April 1919 — Useful Substitute. [ARTICLE]

Useful Substitute.

Not least novel of substitutes Is the use of iron in place of wool for. Altering air for compressors and for cooling electrical apparatus. The new Alter is provided with long and crooked passages, in which dust particles are held up by the sharp turns and simple friction along the stralghter portions of the route. The air is quite free from moisture. Little pressure Is necessary, and the cleaning seems to be quite effective.