. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fig. 102.—Double-bar Link with Rods Fig. 103. —Double-bar Link with Rods outside. The former plan is cheaper to make, is simpler in construction, and hasfewer parts to get out of order and adjust; and when adjustment is required,it is easier to make, and there is less chance of its being done in head-gear, part of the work of moving the valve is done by thesterii-going eccentric, so that the wear is not limited to the one eccentricstrap. When properly hung, the slott
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fig. 102.—Double-bar Link with Rods Fig. 103. —Double-bar Link with Rods outside. The former plan is cheaper to make, is simpler in construction, and hasfewer parts to get out of order and adjust; and when adjustment is required,it is easier to make, and there is less chance of its being done in head-gear, part of the work of moving the valve is done by thesterii-going eccentric, so that the wear is not limited to the one eccentricstrap. When properly hung, the slotting motion is exceedingly small, andthe valve motion is as perfect as with the other form. The objection to itis that the eccentrics are larger in diameter than those with the other links,and the links themselves are longer, and more space is required for theeccentric-rods to move in. SINGLE ECCENTRIC GEAR. 285 Size of Bar Links.—Let D be the diameter of valve spindle, found asbefore. Fig. 102, distance between centres of eccentric pins, 3 to 4 times throwof eccentrics. Depth of bars . . = 1-25 x D + f of bars . . = 0
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