Horse Power. It is well known among engineers, that a horse is capable of raising a weight of about 150lbs. 220ft. high in a minute, and to continue exertions enabling him to do that for eight hours a day. Multiply the number of lbs. by the height to which they are raised in a minute, 150 by 220, gives 33,000 lbs., and the power of a horse is generally expressed by a sum, varying from 30,000lbs. to 36,000lbs. raised one foot high in a minute. One horse can draw horizontally as much as seven men. In trains of machinery from one-fourth to one-third is allowed for friction in calculating its equivalent of horse power.