Inaugural Address by the President. 27 



we get the difference of potential equal to that of the Daniell 

 cell analogous with this arrangement of films. 



As touching the reception of my conclusions by the scientific 

 world, it may be said that some accepted them fully, while 

 others merely modified their definitions so as to save them from 

 contradiction by my experiments. Professor Clerk Maxwell^'^ 

 was among the first to agree with me, and the interest taken 

 in the experiments and acceptance of the conclusions drawn 

 from them by one occupying a place so high in the scientific 

 world doubtless led others to consider them. 



Having now completed the more drily scientific part of my 

 address, I shall ask your permission to describe a few 

 applications of electric power arranged for the convenience of 

 my own home, and afterwards to describe and exhibit experi- 

 ments on the more important modern developments of electric 

 art in wireless telegraphy and theWehnelt interruptor. 



At and about my home at Longhurst we employ, besides 

 electric lighting eight electric motors and five pieces of apparatus 

 in which electric heating is used. Fig. . 3 represents an 

 electrically driven gravel sitter"; The/motor is seen on the top 

 driving the barrel screen which separates out the coarsest gravel, 

 delivering it at the end into a barrow. Below the barrel screen 

 is a sieve hung on springs and caused to vibrate and shake 

 about by blows on its edge from the cams on the barrel screen. 

 This delivers fine gravel into a second barrow and lets the sand 

 fall through into a third. The economy over the usual method 

 with two incHned flat screens is in the fact that only one 

 shovelling is needed instead of say three or four for the two 

 screenings, and the subsequent filling of the barrows with the 

 product to be wheeled away. 



The spiral shaped cam seen on the top is arranged to rise 

 periodically with its supporting piece (which is hinged to the 

 main frame) and fall suddenly as it is being rotated by contact 

 with the revolving drum of the screen. The blow given by its 

 fall shakes out any stones that may have become wedged 

 between the rods of the screen. 



17. Elementary Treatise on Electricity, p. 149. 



