Page Victor W. The Modern Gasoline Automobile. Its Design, Construction, Operation and Maintenance

New York: The Norman W. Henley Publishing Company, 1921. — 1032 p.The modern motor car has reached that period in its development where one can safely say that it has become perfected to such an extent
that further improvements must be in matters of detail only and not in alterations of essential components. It has been so widely adopted and is used in so many industrial applications that even the most conservative must admit the automobile has ceased to be an experiment and it is a reliable method of transportation that has demonstrated its worth conclusively. It is said that there are over 8,500,000 motor vehicles in use in the leading countries of the world, and the yearly output of the world’s manufactures is approximated at about 1.750,000 cars per annum. Of
this number 6,500,000 power-propelled vehicles are used in the United States and the 1919 output of domestic producers is estimated at
nearly 1,500,000 automobiles. The enormous demand existing for this practical conveyance has impelled the manufacture of well-developed
types of motor cars which can be sold at very moderate prices because they are produced in large numbers. This has resulted in a wide increase in the number of motorists and many who formerly could not afford the higher priced automobiles have become motor car operators because they can maintain the moderate priced cars at present obtainable without too great expense.