330 



Messrs. Trowbridge and Sabine on 

 Left Terminal. 



•461 

 •464 

 •462 



•611 

 •609 

 •607 



•582 

 •567 

 •574 



•522 

 •543 

 •532 



•508 

 •500 

 •502 



•551 



•585 

 •570 



•554 

 •556 

 •542 



•462 



•609 



•574 



•532 



•503 



•569 



•551 



2-62 



345 



325 



301 



2-85 



322 



312 



Number of revolutions per second, 5406. 

 Length of spark, '23 centim. 



The discharge of a glass Leyden-jar gave the following 

 values, when reduced to seconds, different lengths of spark 

 being used. 



Length of 

 Spark. 



*4 centim. 

 1-3 „ 



Terminal. 



/Right 1-66 



1 Left 3-33 



" Eight 1-71 



Left 3-30 



Time of Successive Oscillations. 



3-22 

 3-37 

 3-32 

 3'43 



330 

 330 

 3-45 

 342 



344 

 3-36 

 3-37 

 343 



342 

 3-42 



3-50 



Fig. 7 shows that the length of the spark exerts an in- 

 appreciable effect. 



The following table gives the values in millionths of a 

 second of the successive oscillations on six negatives taken 

 with small air condenser under the conditions given on the 

 preceding page. The first on the right terminal is a half- 

 oscillation. The rest are double oscillations. 



1-65 

 1-68 

 1-90 

 1-95 

 1-62 

 1-64 



Right Terminal. 



300 

 3-22 

 3-11 

 295 

 3-01 

 3-18 



3-24 



2-99 

 301 

 300 

 3-34 

 3-14 



3-38 

 3-35 

 3-31 

 308 

 3-04 

 3-18 



3-06 

 3-03 

 3-00 

 3-06 



3-03 



2-91 

 2-97 

 329 

 320 



311 3-24 



2-85 3-39 



3-19 



321 321 309 312 



2-90 



3-03 303 316 



1-74 



3-08 



312 



3-22 



3-04 



309 



307 



313 



3-03 









Left Terminal. 









2-62 



3-45 



3-25 



3-01 



2-85 



322 



3-12 







2-89 



3-50 



3-08 



3-21 













3-11 



3-12 



3-30 



2-96 



3-35 



3-39 



3-16 



3-06 





2-75 



363 



302 



2-97 



3-48 



3-22 



300 



3-18 



3-19 



2-84 



319 



3-36 



2-89 



3-41 



3-00 









2-88 



319 



3-13 



2-90 



2-96 











319 



The values for the different negatives are plotted in figs. 1, 2; 

 the mean values, in figs. 3, 4. The time of the first half- 

 oscillation was doubled in plotting. On each ordinate is 



