A couple of interesting points in the report - the propellers seem to have been too large for the engine power, given that rpm could not be sustained while towing. The boiler terminology is unclear, but it seems likely that they were the box-shaped predecessor of the Scotch boiler (as on Warrior), through the pressure was twice as high as that used at sea at the time - however as the forces on a boiler increase with its area, large boilers of the same design are relatively much weaker. However the boilers may have been of locomotive design.
Sean [Non-text portions of this message have been removed]
