22: boiler

With the engine’s frame completed, it’s now ready to support the heart of the engine: the boiler!

The dimensions were taken from original drawing. Although the CK Holliday’s spec calls it a 32″ diameter boiler, its actual diameter varies a little due to sheet metal thickness and section lapping. Anyway, its norminal diameter is still just that–32″.

The cutaway view shows how sections of the boiler are welded together.

The holes at the top will receive the steam dome and smoke stack.

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