36 Mr. 0. J. Lodge. Experiments on [June 4, 



39. Two Pint Jars end to end, " Longer Leads " (14th May, 1888). 



Here the sharpness of the maximum is so great as to make it 

 probable that u = 30 happens to hit the right place pretty exactly. 



The calculated wave-length for this value of u (remembering to 

 substitute 0'3 for O4 in equation (24) because of the less thickness of 

 these jar-rods) is 2^^(1700 X 721) = 7000 cm., or 70 metres ; a, 

 trifle less if the leads capacity is omitted ; whereas the double length 

 of the recoiling wires indicates 76J metres. 



This is not very good, and I hope that better calculation applied to 

 the data will give a better result. The self-induction as estimated is 

 almost certainly less than the true : but how much less I am unable 

 to say. Another uncertainty is the appropriate capacity of the jars for 

 these high frequencies. It is not likely that the K for the glass will 

 be just the same for 4,000,000 vibrations a second as it is under 

 steady strain. 



40. Single Voss Jar, with " Longer Leads." 

 (Knobs of discharger set exactly 1 cm. apart.) 



