That is the best info I have ever seen. Many, many thanks for taking the time to post it. I have printed out the pages and hopefully the dark clouds of ignorance are moving away.
The info you provided clearly shows and the sequence of events initiating the process (p381), something which I have not seen explained elsewhere.
>>They are finicky to operate and if found in a modern power plant are used only for emergency back-up.
I am not surprised. One of the issues with this solution is that to work well the flow must contain a lot of energy. If you have a large volume of steam this is not a problem, but on a modelling scale much of the steam energy will be absorbed by the boundary layer effect, and increasing the volume of flow would quickly deplete a model boiler pressure reserves.
If they are only used as a backup in 'modern' boilers, do you know what mechanisms are used in their place?
I will try to hunt down the model engineer article you mentioned to see if they succeeded in making one work at such a small scale.
Best regards and a (sadly) virtual