I Have recently restored a 'Miranda' steam launch that i made about 30 years ago. I am at present updating the steam engine and boiler and have managed to find most of the build information from my old files. However the only detail i do not seam to have is at what working pressure the engine and boiler were originally ment to operate at. I have built a pressure test rig to initially test the boiler and would be grateful if anyone could let me know what the original working pressure was, so i can check the boiler.