FIG. 17. SECTION OF APPARATUS IN FIG. 16.
“Experiment V.—Without having the object of the instrument explained to her, the lady was brought into the room and asked to place her fingers on the wooden stand at the points, L M, Fig. 16. I then placed my hands over hers to enable me to detect any conscious or unconscious movement on her part. Presently percussive noises were heard on the parchment, resembling the dropping of grains of sand on its surface. At each percussion a fragment of graphite which I had placed on the membrane was seen to be projected upwards about 1-50th of an inch, and the end, C, of the lever moved slightly up and down. Sometimes the sounds were as rapid as those from an induction-coil, whilst at others they were more than a second apart. Five or six tracings were taken, and in all cases a movement of the end, C, of the lever was seen to have occurred with each vibration of the membrane.
“In some cases the lady’s hands were not so near the membrane as L M, but were at N O, Fig 17.
SCALE OF SECONDS.
FIG. 18. DIAGRAM SHOWING TENSION IN CROOKES’ APPARATUS (FIG. 15 AND 16) OUTSIDE HOME’S INFLUENCE.
“The accompanying Fig. 18 gives tracings taken from the plates used on these occasions.
“Experiment VI.—Having met with these results in Mr. Home’s absence, I was anxious to see what action would be produced on the instrument in his presence.
“Accordingly I asked him to try, but without explaining the instrument to him.
“I grasped Mr. Home’s right arm above the wrist and held his hand over the membrane, about 10 inches from its surface, in the position shown at P, Fig. 17. His other hand was held by a friend. After remaining in this position for about half a minute, Mr. Home said he felt some influence passing. I then set the clock going, and we all saw the index, C, moving up and down. The movements were much slower than in the former case, and were almost entirely unaccompanied by the percussive vibrations then noticed.