. Il giornale ferroviario stradale . sed da contatto su asse. Ogni corsa ha avuto inizio con questo contatto di marcatoin; a fine corsa il punto di contatto tra la ruota e la rotaia era marcatosulla rotaia, e la vettura si è fatta rotolare fino a quando la freccia sulla ruota non è nuovamente entrata in contatto con la rotaia, dando la parte finale frazionaria di un giro da utilizzare che ingeriva la lunghezza totale di corsa dai giri della ruota, che è stato sottratto dalla lunghezza di corsa dalle misurazioni del nastro per ottenere la distanza percorsa. £ -C- ?- A C FIG. 3.-METODO PER OTTENERE UNA DISTANZA MEASUREMENTOF ACCURATA RICHIESTA PER I FERMI A-posizione della ruota all'inizio.B-posizione di whe

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. The Street railway journal . sed by contact on axle. Each run started with this markin contact; at stop the point of contact between wheel and rail was markedon rail, and the car rolled on until the arrow mark on wheel again came incontact with rail, giving the final fractional part of a revolution to be used ingetting the total length of run by wheel revolutions, which was subtractedfrom the length of run by tape measurements to get the distance skidded. £ -C- ?- A c FIG. 3.—METHOD OF OBTAINING ACCURATE MEASUREMENTOF DISTANCE REQUIRED FOR STOPS A—Position of wheel at start.B—Position of wheel at stop. C—Position to which wheel was rolled to get last fractional part of a revo-lution. S—Point at which brake signal was given, determined by record of revolu-tion counter.A B—Tape measurement; total distance run.A S—Computed from revolution recorder.A B—A S = Distance to stop = S B. The car was placed near the starting point and moved back-ward or forward until the contact on the axle drum was closed, . pencil farther than it was ordinarily drawn by the clock circuit, produced a clearly denned record of the exact time at which thesignal bell was rung. When the car was brought to a full stop, the bell was rung again in order to make a record of the timeelapsed between brake signal and stop. The position of the pointof contact of the front wheel was then carefully marked on thetrack and the car moved slowly along until the first chalk markmade on the wheel was brought again in contact with the rail, and the rail was marked at this point. A tape measurement wasthen made between the first and second marks, giving accuratelythe total length of run, and between the second and third marksto determine the distance traversed in the final fractional part ofa wheel revolution. The distance from start to brake signaldetermined by the wheel revolution record on the chronographchart was calculated; this distance deducted from the total lengthof run (a tape measurement),

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1880
• booksubjectstreetr
• bookyear1884