. Canadian macchinari e macchine utensili per la lavorazione di metalli (gennaio-giugno 1919). essa diventa in accurate. Se per qualsiasi motivo si thoughtthe estensimetro viene dando lettura difettoso-rali, opportunamente disposti in corrispondenza del micrometro-tachment può prendere il posto di un testspecimen e dial letture possono bechecked contro il movimento della vite themicrometer. Il quadrante è tenuto ina cup che è fissato al puntone byscrews. La coppa può essere regolata in alto ordown fino a quando le letture corrispondere aquelli della vite micrometrica. Dice Modifica nella scheda.-Ci istalk di alcuni cambiamenti nel consiglio di amministrazione di theCanadian Auto e Companyafter Fonderia di un

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. Canadian machinery and metalworking (January-June 1919). it becomes in-accurate. If for any reason it is thoughtthe extensometer is giving faulty read-ings, a suitably arranged micrometer at-tachment can take the place of a testspecimen and the dial readings can bechecked against the movement of themicrometer screw. The dial is held ina cup which is fastened to the strut byscrews. The cup can be adjusted up ordown until the readings correspond tothose of the micrometer screw. Rumored Change in Board.—There istalk of some changes in the board of theCanadian Car and Foundry Companyafter the annuiil meetine takes place.With the retirement of Hon. N. Curryfrom the presidents chair, to becomechairman of the Board of Directors, anew president will have to be appointed, the first change of this kind since theinauguration of the company. It is gen-erally thought that W. W. Butler will bethe man chosen. It is understood thatJ. Frater Taylor, chairman of the boardof the Lake Superior Corporation, willioin the board of the Canadian Car andFoundry Co.. EXTENSOMETER BEING PLACED IN POSITION ON TEST PIECE. February 6, 1919 135 Some Pointers on Rail Mill Practice An Analysis of Modern Methods With Particular Reference to Roll Designing and Shrinkage Problems—Experimental Data— Designing the Rail Mill Passes—Edging Pass Work Varies By W. S. STANDIFORD THE manufactured steel rails havereached a high grade of perfec-tion, due to the fact that the pro-ducers have availed themselves of everyadvantage that science and researchcould afford, and railroad engineers havelearned from experience the qualitiesthat are most desirable under moderntraffic conditions. Perfection, however, has by no means been reached, and thelong reach of rail breakages each wintertjives an approximate measure of the im-portance of the problems that are yet tobe solved. In view of these conditionsit is desirable to make a critical analysisof prevailing rail mill practice and roiidesigning methods as a basi

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectmachinery
• bookyear19