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Traction Engines<br />

excellent arrangement of spring mounting, by placing<br />

the intermediate shaft on the same horizontal centre-line<br />

as the main axle. There are some serious drawbacks<br />

to the two shafts being placed in this manner, but this is<br />

not the time to mention them.<br />

Advance Company. — The Advance Company's<br />

arrangement is shown by Fig. 150. The main axle is<br />

FIG. 150. SPRING MOUNTING. ADVANCE CO.<br />

attached to the bracket, which is pivoted to the cast­<br />

ing shown ; the casting and axle are capable of vertical<br />

movement sufficient to compress the spring, and relieve<br />

the boiler of jar and sudden strain. The free end of<br />

the bracket is broad and long, and slotted to take the<br />

two studs, with nuts which are tightened to allow the<br />

220

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