Читать книгу Barkham Burroughs' Encyclopaedia of Astounding Facts and Useful Information, 1889 - Barkham Burroughs - Страница 131

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A horse will travel 400 yards in 4–½ minutes at a walk, 400 yards in 2 minutes at a trot, and 400 yards in minute at a gallop. The usual work of a horse is taken at 22,500 lbs. raised 1 foot per minute, for 8 hours per day. A horse will carry 250 lbs. 25 miles per day of 8 hours. An average draught-horse will draw 1600 lbs. 23 miles per day on a level road, weight of wagon included. The average weight of a horse is 1000 lbs.; his strength is equal to that of 5 men. In a horse mill moving at 3 feet per second, track 25 feet diameter, he exerts with the machine the power of 4–½ horses. The greatest amount a horse can pull in a horizontal line is 900 lbs.; but he can only do this momentarily, in continued exertion, probably half of this is the limit. He attains his growth in 5 years, will live 25, average 16 years. A horse will live 25 days on water, without solid food, 17 days without eating or drinking, but only 5 days on solid food, without drinking.

A cart drawn by horses over an ordinary road will travel 1.1 miles per hour of trip. A 4-horse team will haul from 25 to 30 cubic feet of lime stone at each load. The time expended in loading, unloading, etc., including delavs, averages 35 minutes per trip. The cost of loading and unloading a cart, using a horse cram at the quarry, and unloading by hand, when labor is $1.25 per day, and a horse 75 cents, is 25 cents per perch—24.75 cubic feet. The work done by an animal is greatest when the velocity with which he moves is ⅛ of the greatest with which he can move when not impeded, and the force then exerted .45 of the utmost force the animal can exert at a dead pull.