Scales off boilers
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Revision as of 09:38, 2 July 2018 by Levon ayanabudbuda (talk | contribs)
If the water used in the boilers of steam engines is 'hard' (high mineral content, particularly calcium), boiling off the water leaves calcium layers (scales), especially on heating surfaces. This has to be periodically rinsed or scrubbed off.
- "The scales have fallen from my eyes"(Acts 9:18)