46 BULLETIN 119, U. S. NATIONAL MUSEUM, 



The combustion chambers entering the side of each cylinder near the 

 top are turned out of solid steel f orgings and secured to the cylinders 

 by brazing. 



All five piston rods operate on one crank pin. One of these rods 

 is formed of a steel forging terminating in a sleeve which encircles 

 the crank pin and is provided with a bronze lining in order to insure 

 a proper bearing surface between the connecting rod and the crank 

 pin. The upper half of this steel sleeve forms an integral part of 

 the main connecting rod and is rounded off to a true circle on its ex- 

 terior circumference except at the point where the rod joins it. The 

 other four rods terminate in bronze shoes which bear on the exterior 

 of the steel sleeve and are held in contact by cone nuts threaded to 

 the sleeve and locked. 



On one side of the crank shaft and near the crank arm is a double- 

 pointed cam bearing on the exterior of the hub of the drum and 

 driven by suitable gears at one-fourth the speed of the crank shaft. 

 The cam operates the exhaust valves of all cylinders through rollers 

 and punch rods in contact with the exhaust-valve stems. 



The gasoline manifold consists of a tube bent to a circle and having 

 five branch tubes each leading to one of the automatic inlet valves 

 which fits removable cast-iron seats fastened in the upper part of each 

 combustion chamber. The cooling water is led to the cylinder jackets 

 on the starboard side through a circular tube connected by a pipe 

 with a centrifugal pump. The hot water manifold is likewise cir- 

 cular and situated on the port side. The water is led from the 

 jackets through the manifold and through two connections to two 

 radiators. 



The total weight of the engine is approximately 124 pounds, and 

 the entire power plant including cooling water, carbureter, batteries, 

 etc., weighs less than five pounds to the horsepower. Maximum 

 power developed was 52 horsepower at 950 revolutions per minute. 



Cat. No. 248,651 U.S.N.M. 



Adams-Farwell Five-cylinder Revolving Gasoline Motor. Made by The 

 Adams Co. Presented by the Gyro Motor Co. 



This is a four-cycle air-cooled motor with the cylinders bolted to- 

 gether and revolving around a vertical crank shaft which is keyed 

 to a stationary base. The pistons are connected to the same crank 

 pin, which is part of the crank shaft, so that the pistons can travel 

 only in a perfect circle about their common center. The circle de- 

 scribed by the pistons being eccentric to that of the cylinders, the 

 pistons approach and recede from the cylinder heads. The position 

 of the cylinders in relation to each other permits the use of a single 

 throw crank and also makes it possible to operate five valve rods from 



