g4 BULLETIN 173, U. S. NATIONAL MUSEUM 



spring, which allows a free turning of the pulley on the shaft to an 

 extent sufficient to counteract the jerks or impulses, which are trans- 

 mitted to the governor by the uneven operation of the engine. 



The inventor states that the ordinary crank motion of a steam 

 engine results in an unequal operation that is not always equalized by 

 the flywheel of the engine. This irregularity, though not always per- 

 ceptible, is transmitted to the governor, which, when operated un- 

 evenly, would exaggerate the variations. This device is designed tO' 

 prevent the jerks being transmitted to the governor. 



BODEMER INDIRECT ACTING GOVERNOR, 1876 



U.S.N.M. uo. 309243; original patent model; transferred from the United States 

 Patent Office; not illustrated. 



This model was submitted with the application for the patent 

 issued to Johann Georg Bodemer, of Zschopan, Germany, April 25^ 

 1876, no. 176591. 



The model represents a ball governor, connected to a belt shifter 

 and a tight and loose pulley, through the medium of which the 

 regulator valve is opened or closed according to which of two belts is 

 transferred from the loose to the tight pulley. 



The belt shifter is actuated by a friction pin and is so arranged that 

 it will put the regulator into immediate action in the required di- 

 rection as soon as the governor balls deviate from their normal posi- 

 tion ; it will keep the regulator in action as long as the balls continue 

 to deviate in the same direction; it will put the regulator out of 

 action as soon as the balls start to return toward normal ; it keeps the 

 regulator out of action as long as the balls are returning to normal ; 

 and causes the regulator to renew its action should the balls again 

 begin to increase their deviation before having arrived at the normal. 



FOWLE MARINE-ENGINE GOVERNOR, 1877 



U.S.N.M. no. 30SG98 ; original patent model ; transferred from the United States 

 Patent Office ; not illustrated. 



This model was submitted with the application for the patent issued 

 to Joseph W. Fowle, of Boston, Mass., August 14, 1877, no. 194037. 



The model represents a 1-cylinder, vertical marine engine connected 

 to a propeller shaft and propeller in the ordinary manner, with a float 

 or inertia device for closing the throttle valve of the engine each time 

 the vessel in which the engine is installed pitclies sufficiently to raise 

 the propeller out of the water. 



The gear consists of a heavy weight suspended in suitable guides 

 and stops near the keel of the ship. This weight is not rigidly fixed 

 relative to the ship but tends to float in position as the vessel rises and 

 falls. The change in relative positions actuates a valve lever on an 

 auxiliary steam cylinder and piston, which, in turn, moves the main 

 throttle valve of the engine. 



