THE ANIMAL AS A MOTOR. 



55 



common range of speed, the handle being 15 to 18 

 inches long, and about 3500 foot-pounds per minute a 

 fair performance. 



Mr. D. K. Clark gives the following as the work, 

 for one day, of a laborer, under the specified condi- 

 tions : 



" boat.... 190 1230 " " 



One man breaks 1.5 cubic yards of stone, or quarries 

 5 to 8 tons of rock per day. 



The walking speed of man is three to four miles an 

 hour. Running eight miles an hour is a common limit ; 

 but 100 miles in a day for a week together, and i \\ 

 miles in one hour, have been attained by practised 

 pedestrians. One hundred yards dash " has been ac- 

 complished at the rate of 20 miles an hour. A skater 

 has attained in one mile over 20 miles an hour ; on the 

 bicycle about 30 miles an hour has been reached ; 50 

 miles has been made in 2J hours, 100 miles in 6 hours, 

 388 in 8 hours, 900 in 72.4hours.'^ Swimming long dis- 

 tances only an average of about one mile an hour has 

 been made by man ; but the porpoise plays about the 

 bow of ocean steamers making 14 and 15 miles (statute) 

 or more per hour. 



Ruhlmann finds the work done by a Prussian soldier 

 on the march, carrying 64 pounds, to be about 3,000,000 

 foot-pounds per day. Various authorities give about 



Load. 



Kind. Weight. 



Carrying brick .. . 106 lbs. 



coal 100 " 



Loading wagon . . 100 



Work. 

 600 mile-lbs. 

 342 - " 

 270 " " 



* Whittaker's Almanach, 1893. 



