This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
The pipes for heating the building will in general be run outside of the plaster, and will be bronzed to match the radiators and other exposed piping. The number and size of the pipes will depend upon the system of heating used. For a large building, the heating is generally put in charge of an engineer who devises a system subject to the approval of the architect, but some stated conditions will in general be found to apply to most buildings.
Fig. 247. Electric outlet in ceiling.