The horsepower available at the driving-axle, conveniently called the brake horse-power, is from 20 to 30% less than the indicated horse-power, and the ratio, B.H.P./I.H.P. =E, is called the mechanical efficiency of the steam engine.
In a particular case where the boiler pressure was maintained constant at 130 lb per square inch, and the cut-off was approximately 20% of the stroke, the values c =55 and b=o 031 were deduced, from which it will be found that the value of the piston speed corresponding to the maximum horsepower is 887 ft.
At 150 revolutions, each turbine will have a nominal horsepower of woo.
Each of them was independently governed, and furnished together 363 horse-power in actual effect, an amount which, considering that their total weight was only 600 lb, gave the extraordinary efficiency of over i horsepower for every 2 lb weight.
Additionally, we will at some point in the not-too-distant future have enough biological understanding of the genome and enough computer horsepower to model complex interactions in the body.
In 1905, 1146 establishments reported power, as against 1360 in 1900-a decrease of 15.7%, but the total horsepower increased from 155,545 to 190,777, or 22.7%.
Of this power about half would be used at the blastfurnaces themselves, leaving 750,000 horsepower available for driving the machinery of the rolling mills, &c. This use of the gas engine is likely to have far - reaching results.