IMAGE EVALUATION TEST TARGET (MT-3) // !.0 l.i 1.25 6" 14 116 I vj ^ /] ,.^3 c'l > '■c^i' .^^ / ^> ^ w PhotograDhic Sdences Corporation /3 Wi»T MAiN STREET WlbSTIR.N.Y. MSaO (716) 872-4303 ^^ ,\ ^v ^ :\ \ ^Q> V 4. o^ rv ^(^ <^ '^ CIHM/ICMH Microfiche Series. CIHM/ICIVIH Collection de microfiches. Canadian Institute for Historical Microreproductions / Institut Canadian de microreproductions historiquas (meaning "CON- TINUED"), or the symbol V (meaning "END"), whichever applies. iVIaps, plates, charts, etc., may be filmed at different reduction ratios. Those too large to be entirely included in one exposure are filmed beginning in the upper left hand corner, left to right and top to bottom, as many frames as required. The following diagram* illustrate the method: Las images suivantes ont 6t4 reproduites avec le plus grand soin, compte tenu de la condition at de la netteti de l'exemplaire film6, et en conformity avec les conditions du contrat de filmage. 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Les diagrammes suivants illustrent la mithode. 1 2 3 4 5 i^mericaii I^ailwa^ Wja^tiei' W[Echanic^' j^^^ociatioij, OFFICE'OF THE SECRETARY. J. II. SETCHELL, Secretiirv. J. DAVIS BARNETT. President. Dunkirk, Nov. 20th, 1885. The Driver IJrake Coininitt(ie reijuest an early reply to the following (lueries, viz.. 1 — Are there any circumstances under which you would recommend the application of driver v v. brakes, and if on all classes of engines, viz.: passenger, freight and switching ?^a-- 'd^L^-Lix/Lu.ux^ 2_What are the best substances, the best shape, and best size for brake-blocks to be u^^^a^.^^ X^e^^ on steel tyres ? /^A-d-y^^i^-i^'^^ 3 — Does the application of driver brakes lessen engine mileage between each tyre turning, etc? If so, to what extent? /^^^f-^ /ic2Z2^ 4 — Does their application lessen mileage benveen repairs that can be got out of journals, axle boxes, horn blocks and wedges, side rod brasses, etc.? 'l~\^/yu^ IcZtte^ 5 — Is any injury done to engine o^' side rods by applying brake blocksf on one side only, and between wheels, (wedge type,) thus forcing the axles further apart, or is there a practi- cal advantage in gripping each wheel with brake blocks on both sides, (compression type,)?/^ _ — Is it advantagcyus tflcouple (Tiivci, ucii^v^i «iiu i;.«iii v^^^^^^^^^ ..^ ^.^^^^ ^..^ ^.- -. / 1—^./)' j ' / will apply the whole ? ':rfAjy.i^ci. /^.^^ /^ J h-i^y^tyH i>U-^uL ^>'v^i^V-^^^'^'^^^-'-^'^ -Which is the best position for brake blocks so as to give the greu ■ A power and least a^;;^^^'^ V^ interference with the elastic action of the main springs? ^ Ic^/^Qa, O^-l/^u^ ^K^ ^^.^„^J^ ^"^^^x 8— What percentage of the weight of the drivers is it judicious to utilize for brake resist- ^ ' ance in view of the train breaking loose, and the possibility of the front (by the auto- matic application of the brake,) being brought to a stop earlier than the rear portion, thus resulting in a rear pitch-in ? ^,i^^_^^/^i^ ^^ h^i^A^/^t. Jh^v-^, .&rH^Axyf^( A^-^ 9_Do you recommend the application otst^am' or other form of power-brake /on Jnvers CLaa/o i'->^^~^t:' when the train is not provided with any form of continuous brake, — or, in other words, — l^CeL/.^^, is tliere any element of danger in having a powerful brake resistance at the front end of the train? ^ l^o^^-^af J^r^M^^}' ItJ^^U 10 — As there are several ways of applying brakes through an electric current, should the electric wire be so connected with the source of power that the touching of a button or key by train conductor, would give him the opportunity of applying the brakes on the driving and tender wheels as well on the car wheels ? y/^-^rC Cr-i^ /7al 7/. 6^1 ^^y)K^'?^ Do not cfinfine your answers to the above leading questions, but in ad- dition kindly give any experience, information, statistics or opinions you may have on tlie general subject of tlie application of driver brakes to loco- motives, [either for or against ] On behalf of Committee. Replies to be addressed to J. DAVIS HARNETT, FORT HOPE, ONTARIO, CANADA. H. A. WHITNEY, Inter-Colonial R'y. J. DAVIS BARNETT, Grand Trunk R'y. / It