On Jul 25, 2:03*am, Clive wrote:
In message
,
Andy Dingley writesFor intermittent use,
condensation and wet carry-over (even though this wasn't as bad as
priming) was a problem.

Priming is normal for any engine with an over full boiler, indeed before
a steep bank that the fireman would have to watch the water very
carefully, it wasn't unusual for the injectors to be kept going long
after the water disappeared out of the top of the glass until priming
started, then you knew you had a full boiler.
--
Clive

Priming is never "normal". If you'd ever seen it you'd know why.
Significant priming would wreck the superheater (if fitted) and damage
the steam engine.
No-one in their right mind is going to lose sight of the water level.