Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 694
by the retardation due to the pressure. When the revolution of the rollers is wholly stopped, thecar acquires the full speed of the rope. Underground Railroads.—In London, England, the underground system of railroads has beenin operation since 1863, when a section of 3£ miles was opened. The track… … the same as on ordinary steam railroads. It traverses numerous tunnels (see Tunnels) and opencuts. The main difficulty in its construction was the avoidance of the immense network of sewer-pipes which underlie the metropolis. The present length (1879) of all the lines is over 20 miles, 3660.
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