488 



Further Experiments 



[Oftober, 



Experiment IV. — (Tried on an occasion when the power 

 was stronger than on the previous occasions). Mr. Home 

 was now placed 3 feet from the apparatus, his hands and 

 feet being tightly held. The clock was set going when he 

 gave the word, and the end b of the board soon descended, 

 and again rose in an irregular manner, as shown in Fig. 8. 



The following series of experiments were tried with more 

 delicate apparatus, and with another person, a lady, Mr. 

 Home being absent. As the lady is non-professional, I do 



Fig. 8. 



not mention her name. She has, however, consented to 

 meet any scientific men whom I may introduce for purposes 

 of investigation. 



A piece of thin parchment, A, Figs. 9 and 10, is stretched 

 tightly across a circular hoop of wood. B c is a light lever 

 turning on D. At the end B is a vertical needle point touching 

 the membrane A, and at c is another needle point, projecting 



Fig. 9. (Plan.) 



horizontally and touching a smoked glass plate, ef. This 

 glass plate is drawn along in the direction h g by clock- 

 work, K. The end b of the lever is weighted so that it 

 shall quickly follow the movements of the centre of the 

 disc, A. These movements are transmitted and recorded 

 on the glass plate E f, by means of the lever and needle 



