TriDisaclidiis Sociciv Na-t'iil .Ircliitrcis ami Marine lliitjinccrs. I'ol. 2J, /pip. 



Plate up 



To iUustratc f^apcr on "Electric Propulsion of Merchant Sliij^s,' 

 hv ir. I.. R. linnncf. Esq.. Member of Council. 



Low Speed Ship Gear and Pinion. Pinion Diameter 11.44 Inches. Pitch 3>^ Inches. 

 Normal Load 1,150 Pounds Per Inch Face, Tooth Speed 1,272 Feet Per Minute. 

 Time Run, About 400 Hours at Sea. 



Experimental Gear Disc and Pinion. Pinion Diameter 7.28 Inches. Pitch 4 Inches. 

 Load Carried 3,000 Pounds Per Inch Face. Tooth Speed 7,000 Feet Per Minute. 

 Time Run 263 Hours in Schenectady. Has Made 8 Times as Many Tooth En- 

 gagements AS Above With a Pressure, Which, Considering Smaller Pinion Diame- 

 ter, IS Relatively 4 Times as Heavy. 



