San Francisco : Architect and Engineer, Inc · leaf 223
le) BTUs * per dollar for practically every heat require-ment. Your gas companys technical staff has proof, applica-ble to every type of building, and will gladly consult withyou on any installation. No charge for this practical service. *BTU {British Thermal l/n//)—Standard of heat measurement.…
Architecture · Building
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-193-70.webp)
