It depends....do you want to know the boiler horse power, or indicated horsepower?

Either one can be figured by formula. Roughly the boiler horse power can be determined if you know the heating surface as each ten square feet of heating surface is equal to one boiler horse power. Indicated h.p. is p.l.a.n. / 33.000 Where P = the mean pressure in the cylinder, l= the length of stroke, a= the area in square inches being acted upon by the steam and n. = the number of strokes per minute. The length of stroke is actually double the length of the cylinder as the No.9 is double acting.

I am just making a wild guess.....but I think the boiler horsepower might by somewhere around 75 or 80 boiler horsepower. I'm sure Jason has the exact figure, and I would be interested to know how close my wild guess is!

Keith