. Electrical news and engineering . andother types of long stroke engines have been shortenedand strengthened in order to meet these conditions andto occupy less room, and there is also a tendency toincrease the speed to suit direct driven dynamos andgive better regulation. In fact, there seems a tendencyfor the advocates of high and low speed to meet half is of the Sweet or Straight Line pattern, used inall engines made by the Robb Co., is of the simplestand most sensitive form and directly connected to thevalves. The high pressure cylinder is placed next tothe frame, low pressure in rear, an
. Electrical news and engineering . andother types of long stroke engines have been shortenedand strengthened in order to meet these conditions andto occupy less room, and there is also a tendency toincrease the speed to suit direct driven dynamos andgive better regulation. In fact, there seems a tendencyfor the advocates of high and low speed to meet half is of the Sweet or Straight Line pattern, used inall engines made by the Robb Co., is of the simplestand most sensitive form and directly connected to thevalves. The high pressure cylinder is placed next tothe frame, low pressure in rear, and so arranged thatthe cylinder head and pistons may be removed withoutdisturbing the cylinders, valves or other parts. Thevalves are of the Porter type, consisting of a flatplate balanced by a pressure plate, which have provedso successful in the Porter-Allen, Straight Lineand other engines, their greatest merit being simplicityand freedom from wear. Both high and low pressurevalves are attached to the governor in such a way as to. Tandem Compoind Stkam way in a type of engine wiiich will embodv the bestpoints ol cacli. As an example of what is being tlone in this way, wegive an illustration of a tandem compound engine, builtby the Robb Engineering Co., of .Amherst, Nova cut is from one of four engines of 300 h. p. eachrecently installed for the Halifax Electric Tramway railway and lighting purposes, and it represents atype of engine designed with a view to combine the bestpoints of long and short stroke engines. The design of frame and general proportion ot partsis similar to recent types of long and medium strokeengines designed for railway work. The shaft bear-ings, crank and crosshead pins are much larger thanusual, to insure cool running under stress of overload-ing or irregular work. The guides are cylindrical,allowing the crosshead free alignment. The disc crankcontains sufficient metal to permit the crank pin andshaft to be forced in under hea
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