The Artizan . e also = rubs twice over an arc of the crosshead bearing each revolution of theengine. That arc corresponds with the vibration of the connecting the connecting rod is four times the length of the crank, the lengthof that arc is to the length of its chord as 101 to 100 nearly; so that for ourpresent object it will suffice to substitute the length of the chord for thelength of the arc. The length of this chord will be the same part of theradius of the bearing that twice the length of the crank is of the con-necting rod. As the pressure sweeps over the arc twice in a r
The Artizan . e also = rubs twice over an arc of the crosshead bearing each revolution of theengine. That arc corresponds with the vibration of the connecting the connecting rod is four times the length of the crank, the lengthof that arc is to the length of its chord as 101 to 100 nearly; so that for ourpresent object it will suffice to substitute the length of the chord for thelength of the arc. The length of this chord will be the same part of theradius of the bearing that twice the length of the crank is of the con-necting rod. As the pressure sweeps over the arc twice in a revolutionthe loss by the friction will be 4 r3 /P. The Slide Bab, Fig. 1. The pressure transmitted through the connectingrod can always be resolved into two components, one perpendicular to theslide bar and the other parallel to it. In the figure if 5 represent thepressure through the connecting rod it is resolved into r*g perpendicularto the slide bar and r3/parallel to it. This is true for any position, so. arrive at the product of the pressure and travel on the slide bar, it willsuffice to take the rectilineal motion of the crank. The greatest pressurewill be P sr\ = — n and the area of the semicircle of pressure will be 1(M,, -7854PL 7854 sn • em = • to Twice this multiplied by / will be the loss by friction for a completerevolution 2 TO p If the weight oe SHAETiN&be = —, and if the radius of the journals be rit supposing that there is no other pressure than that of weight, andthat the shafting makes one revolution for each revolution of the engine,the loss by friction will be a The total loss by friction on these surfaces will be found by adding theseexpressions to be /P H 2 ri +2 r-> + ——2« 2j-42 ?)-*?} This is the work lost, if we divide by 2 P L, the total power, we will gea quotient free of P expressing the loss in decimal parts of the whole power,As the above calculation is for one cylinder only, in finding this quotientwe must first divide the frictio
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
