Annual report of the Boston Transit Commission, for the year ending .. . titute of Tech-nology and with Professor George W. Pierce of the Depart-ment of Physics of Harvard University, and others. Mr. Mallock did not expect any benefit to result from theabove-named plans. His belief, based on his extended studyand experience, was that relief was to be expected almost en-tirely from having the weight of the trains, as far as practicable, 30 Boston Transit Commission. borne on springs. When trouble occurred on the CentralLondon Railway the non-spring-borne load of the locomotivesthere used amount
Annual report of the Boston Transit Commission, for the year ending .. . titute of Tech-nology and with Professor George W. Pierce of the Depart-ment of Physics of Harvard University, and others. Mr. Mallock did not expect any benefit to result from theabove-named plans. His belief, based on his extended studyand experience, was that relief was to be expected almost en-tirely from having the weight of the trains, as far as practicable, 30 Boston Transit Commission. borne on springs. When trouble occurred on the CentralLondon Railway the non-spring-borne load of the locomotivesthere used amounted to about eight tons per wheel, while withthe motor cars which will run in the Washington Street Tun-nel the maximum non-spring-borne load will be only about oneand one half tons per wheel. Among other experiments a radial truck was used, witha non-spring-borne load, revolved by an electric motor on acircular rail, the latter having forms of support (a) and (b)mentioned above. Experiments were also made with stand-ard cars, running on about 200 linear feet of Plate 2. One of the Eight Coverings over Boston CommonStairways to Subway. The relative effects of various experiments were measureddirectly with the ear; also by observing with a telescope withcross wires the movements of an image on a surface of mercury;with the vibration instrument of Mr. Mallock and with thesound measuring apparatus of Professor Pierce. The infor-mation obtained indicated that sound or sensible vibrationscoming from the Tunnel were much less likely to be noticed byoccupants of buildings than vibrations caused by teams andcars on the surface of the street. It also appeared that thesupport of ties by means of ordinary stone ballast was nearlyor quite as good as any form tried, and accordingly that methodhas been used in all parts of the Washington Street Tunnel. Report of the Chief Engineer. 31 Shelters over Stairways. Most of the stairway coverings for Boston subways andtunnels have been desig
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