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Elbe Motor Lightship e =. The Advantages of the Diesel Engine for This Type of Work Are Manifold as Operating Costs Are Low HE Elbe estuary motor light- ship, Burgermeister - O'Swald (Elbe"1) has been built by Messrs. Nuscke. &.Co. from the. de- signs of H, E. -Johns, of Hamburg. With a motor-driven vessel. not only DIESEL OIL ENGINE AND DYN are the running costs low, but the main engine is ready to start up in a few minutes in cases of emergency, without heavy stand-by charges, such as a steamship would require to keep a. good head of steam night and day. With the motor ship the stand-by and running fuel charges are practically YAMO. SETS ON LIGHTSHIP nil in the daytime, in ordinary weather, unless cruising, also sufficient fuel for a long period can be carried without enctoaching- on the space necessay for the comfort of the crew. There are. four Diesel engines, one BiB Ek of 220 h. p., two of 35 h. p., and one of 6 h. p., all of which were built by Sulzer' Bros,, -of Winterthur. Phe main engine is of the two-stroke type, but the auxiliary motors work on the four-stroke principle. Dealing first with the main engine this is of the single-acting direct reversible class and develops its rated power at 280 r. p. m. Although of the enclosed type, it practically becomes an open engine on the removal of the large steel plates on the crank chamber. The cylinders, of which there are four, have their covers. directly connected to the bed-plate by means of steel columns, thus the pressures are taken up directly by the bed-plate and main bearings, allowing the cylinders to be free to expand in the direction of their axis. These columns are con- nected by diagonal ties and the cylin- der covers are bolted together, giving a rigid design. In connection with the scavenging and exhaust arrange- ments, Sulzer Bros. have © sensibly adoptéd the port system leaving only the fuel and starting valves in the cylinder heads. The scavenging air enters the 'combustion chambers through ports in the cylinder walls, a certain number of the ports being in direct communication with an air chamber, the admission of atmospher- ic air into which is controlled by valves. The fuel valves are arranged in the centers of the cylinders, while the air-starting valves are located on the sides. Burgermeister O'Swald is equipped with the latest types of radio-teleg- raphy, submarine signalling apparatus, beacon-light and fog siren. In addi- tion to Diesel-driven dynamos there are accumulators of large capacity kept charged. Her principal dimen- sions are as follows: Ft. engineeoverall 605. oe 173 Length' Hetween= PoP. Ga. 147% Beat molded. ee 25% Depth wmolded] 3 17% Draueht (72600 es 12y% Height of beacon above W. L........ 52 Displacement, tong, 4), 720 Propelling: motor, Be oH. P.2 . 220 speed, -Knots* 9 The scavenging pump consists of a double-acting piston-pump controlled by a rotating piston-valve in the cas- ing and the crosshead of this pump is arranged as a first- stage air com- pressor, the second and third stages of which are driven by means of bal- ance-levers from the crosshead of the scavenging pump on the port side of the engine. This patented arrange- ment has proved itself advantageous for high speeds, the various pressures being so evenly distributed that the inertia is nearly completely absorbed, thus giving a smooth drive. In the case of the scavenging pump, water