----- Original Message -----
Sent: Sunday, September 22, 2019 1:08
Subject: [RealSTMFC] Photo: CB&Q
An image taken
in 1931 from the Detroit Public Library:
Click on the
image and hold to temporarily enlarge it.
Description: View of two men
unloading alum, via a hose, from a railroad freight car during the
construction of the Chemical Building in the Springwells Station
treatment plant, Detroit water supply system. Printed on
front: "City of Detroit. Department of Water Supply.
Springwells Station. Chemical Building. Contract No. FC-20. Building
construction: W.E. Wood Company. File no. 831. No. 30. Date: 8-6-31. Photo by
Manning Brothers." Typed on back: "Unloading first car of alum; air hose
suspended from cable."
Definition of Alum: The most widely used alum is potassium alum. It was used
since antiquity as a flocculant (promotes clumping of particles) to clarify
turbid liquids, as a mordant (a substance that combines with a dye or stain
and thereby fixes it in a material) in dyeing, and in tanning. Other alums
include sodium alum and ammonium alum.