. Science of railways . e is the air cylinder. The pistons of both cylinders are provided with leatherpacking, that in the air cylinder being held out by springrings. The cylinders are operated by conical valves, theconstruction of which is shown in the detail illustration. These valves are operated through a connecting rod byan auxiliary lever (R) pivoted on the main lever (Q). By an interlocking arrangement, the latch of the mainreverse lever is loosed by raising, that of the auxiliary leverand cannot drop until the two levers are in their normal posi-tion to each other. Ordinarily, the valv
. Science of railways . e is the air cylinder. The pistons of both cylinders are provided with leatherpacking, that in the air cylinder being held out by springrings. The cylinders are operated by conical valves, theconstruction of which is shown in the detail illustration. These valves are operated through a connecting rod byan auxiliary lever (R) pivoted on the main lever (Q). By an interlocking arrangement, the latch of the mainreverse lever is loosed by raising, that of the auxiliary leverand cannot drop until the two levers are in their normal posi-tion to each other. Ordinarily, the valve motion is handled entirely by theauxiliary reverse lever. Consequently, the main reverselever is usually not brought above the deck of the cab, thusleaving more room for the engineer. A separate handle, easilyattached, is provided for the main lever for use in case ofemergency. The auxiliary lever is handled exactly the same as themain reverse lever would be except that of itself it only has LOCOMOTIVE APPLIANCES. 167. 168 LOCOMOTIVE APPLIANCES. a limited throw about its pivot point on the latter. This slightmovement operates the valves in the reversing engine andthe valve motion is moved in the desired direction. Whenthe required notch in the quadrant is reached and the auxiliarylever latched, the gear automatically restores the main reverselever to its normal position relative to the former. This per-mits the main lever to engage with its quadrant and alsocloses the valves of the reversing engine, thus giving both apositive and an oil lock to the gear. The oil cylinder prevents the too rapid movement of thereversing gear when a change of cut-off is made. It is impera-tive, therefore, that the engineer should see that this cylinderis always k6pt full of oil. The frequency with which it shouldbe filled depends on the condition of its piston and piston-rod packing, and these should therefore be kept in good the reversing gear operates too rapidly, this indicatesthat
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