In portable locomotive boilers, where was the draft inducer typically found?

The draft inducer in portable locomotive boilers is typically found in the uptake, which is the flue or duct that carries the flue gases from the firebox to the stack. Placing the draft inducer in this location is crucial for enhancing the efficiency of the boiler system by ensuring optimal airflow through the firebox. This setup aids in effectively drawing combustion gases out of the boiler, which helps to maintain a proper draft and improve combustion performance.

By having the draft inducer in the uptake, it can create a vacuum effect that draws air into the firebox, facilitating a stable and efficient burning process. This design contributes significantly to the combustion quality and overall performance of the boiler, ensuring that it operates safely and effectively under various load conditions. The other locations mentioned would not provide the same level of efficiency for draft creation, which is why the uptake is the most appropriate choice for the placement of the draft inducer.