PLIMPTON, R., "FUNDAMENTAL CHARACTERISTICS OF PRESENT-DAY BUSES," SAE Technical Paper 220050, 1922, doi:10.4271/220050.
The author enumerates the distinctive features of buses designed for city, for inter-city and for country service and comments upon them, presenting illustrations of these types of bus. Steam and electric motive power are discussed and the chassis components for bus service are considered in some detail. The general types of bus body are treated, together with the influences of climatic conditions and local preferences.Comfort and convenience factors are discussed at some length and the problems of heating, lighting and ventilation are given constructive attention. Fare-collection devices and methods are commented upon, and the State and local legal regulations are referred to in connection with their effect upon bus operation.Illustrations are included and a table showing condensed specifications for city buses is presented.