. Railway and Locomotive Engineering. Gear is a modifica-tion of the Walschaerts gear and the prin-ciples of the Walschaerts gear were con-sidered in designing it, the only organicdifference being in the application of in-dependent valves, the stems of one within the other, connectingeach with pins on the combining lever,the result of the combination consistingin a differential motion of front and backvalves. We have never been able to de-termine any positive merit in the arrange-ment to offset the objection to duplicationof parts and cost of maintenance of suchan arrangement. The
. Railway and Locomotive Engineering. Gear is a modifica-tion of the Walschaerts gear and the prin-ciples of the Walschaerts gear were con-sidered in designing it, the only organicdifference being in the application of in-dependent valves, the stems of one within the other, connectingeach with pins on the combining lever,the result of the combination consistingin a differential motion of front and backvalves. We have never been able to de-termine any positive merit in the arrange-ment to offset the objection to duplicationof parts and cost of maintenance of suchan arrangement. The engines to which the Stevens gearwas ? applied had boilers of insufficientcapacity to enable the engines to rendersatisfactory service, and the valve motionrequired considerable more expense formaintenance, owing to the duplication ofparts referred to. We have no figures onhand as to extra cost of maintenanceas compared with single valves, but fromobservation and experience with this classof engine we are safe in stating that the. PAINT MIXING APPARATUS. eter, and 2 ins. apart. A number of are placed on a bench to holdpaints of various colors, and before fin-ishing the days work the workmen pourback into the mixers the quantity ofpaint that may be left over in their pails,and on resuming work next day theysimply open the air valve, which rapidlyand thoroughly mixes the paint, which In grinding co[)per on a carborundumwheel, the copper always clogs. By rub-bing on tallow this is avoided, and itdoes not impede the cutting of the wheel. Painters should not wash their handsin turpentine. Use horse hair with alittle kerosene, and then finish with soapand water. Nbvember, 1912. RAILWAY AND LOCOMOTIVE ENGINEERING. 397 Old Time Railroad Reminiscences. I)V .?^. J, KinHKR. As noted in the previnus article, theprogress exhibited in the development ofthe railways of New England was with-out a parallel, considering the compara-tive newness of the country and theamount of wealt
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