One of them, the Franklin stove, is still in use in hundreds of old houses, and as an economizer of fuel has never been surpassed; another was the lightning-rod.
"American Men of Mind"
Burton E. Stevenson
For this reason, an open heater, or economizer, will give more satisfactory service with intermittently operating apparatus.
"Steam, Its Generation and Use"
Babcock & Wilcox Co.
The fuel used bears directly on the question of the advisability of an economizer installation, for when oil is the fuel a boiler efficiency of 80 per cent or over is frequently realized, an efficiency which would leave a small opportunity for a commercial gain through the addition of an economizer.
"Steam, Its Generation and Use"
Babcock & Wilcox Co.