be transmitted a given distance with a high etticiency, it is more important to 

 know that the same amount of power could be obtained at the objertive point for 

 one-fourth the cost of the former. 

 Lafayette, Ind., Dec. 30, 1896. 



Economy in the Deskjn of Electro-Magnets. By W. E. Goldsbokouoh. 



Published in the Electrical AVorM, Vol. XXIX, p. IW, Feb. li, 1S97. 



An Efficiency Si'rface for the Pelton Motor. By W. K. Hatt. 

 Published in the Journal of the Franklin Institute, June, 1S97. 



On Seiches. By A. W. Duff. 



■Some Exi'Eriments on the Phenomena of the Elevation of the Elastic 

 Limit. By W. K. Hatt. 



Viscosity as a Function of Temperature. By A. W. Duff. 



LAbstract.] 



The author shows the insufficiency of the formuliv proposed by Poisenille. 

 Slotte, Koch, Griitz and others, and finds generalized formulre. 



^ —tan 'a( 5'-f (!) ) 



which are in agreement with all data hitherto obtained, the former applying to 

 water and most substances of slow variation of viscosity, and the latter to glycer- 

 ine, mercury and most substances of rapid variation of viscosity. 



