3 14 Heinze — Varying degrees of Actinism of the X-Rays. 



and gives very constant results. It was actuated by a liquid 

 break which enabled me to regulate the current in a manner 

 which would be impossible with a mechanical break. The 

 performance of the coil bears out Lord Rayleigh's contention 

 that the electrostatic capacity of the coil between the primary 

 and the secondary is an important feature in the performance 

 of a coil and that a condenser in the primary is often detri- 

 mental. My coil has no condenser and the break is practically 

 instantaneous. There is an enormous rush of current through 

 the primary at the maximum output. 



