How was the crown sheet of a locomotive boiler secured?

The crown sheet of a locomotive boiler is secured with radial stays, which are crucial for maintaining the structural integrity of the boiler. The crown sheet is the upper part of the boiler that contains the steam space. Since it is subjected to significant pressure and temperature changes, it must be securely fastened to prevent bulging or failure.

Radial stays are positioned in a way that they can effectively transfer the stresses experienced by the crown sheet to the sides of the boiler. These stays are typically made of steel and extend from the crown sheet down to the shell of the boiler, helping to provide support and distribute the loads evenly across the structure.

This method of securing the crown sheet is essential in locomotive design, as it provides the necessary strength and support to withstand the high-pressure steam generated within the boiler. The use of radial stays also allows for proper thermal expansion and contraction, further ensuring the longevity and safety of the boiler in operation.