Please see the [Transcriber’s Notes] at the end of this text.
Vacuum Cleaning Systems
A Treatise on the Principles and
Practice of Mechanical Cleaning
BY
M. S. COOLEY, M. E.
Mechanical Engineer in Office of the Supervising
Architect, Treasury Department, Washington, D. C.
FIRST EDITION
New York:
Heating and Ventilating Magazine Company,
1123 Broadway
Copyright, 1913,
BY
Heating and Ventilating Magazine Co.