Heating the manufacturing plant : the economical use of steam in heating buildings by the Webster system. Warren Webster & Company
Self-regulating improved low-pressure steam heating and ventilating apparatus, with open boilers. Henry A. Barber (Firm)
The Broomell vapor system: what it is : the vapor system is the evolution of heating by steam ... Vapor Heating Company
Comfort with economy in heating : warm air heaters, steam boilers ... and cooking ranges Richardson & Boynton