ACCELERATION EFFECTS ON ELECTRON TUBES 



1227 



Fig. 16 — Leaf spring vibration machine developed several years ago by Bell 

 Telephone Laboratories. 



Fig. 17 — Acceleration output of the leaf spring vibration machine. 



plitude over a given frequency range. Within the limitations of these 

 machines and their power sources, it is also possible to subject specimens 

 to complex disturbances. For instance, a projected use is the reproduction 

 of recorded equipment vibrations so that the response of tubes to these 

 conditions can be studied in the laboratory. 



Tube Tappers • 



The physical construction of tube tappers used in the electron tube 

 industry varies from the simple manually operated cork mallets to the 

 more complicated automatic tappers. Since it has long been recognized 

 that the reproducibility of manual tapping is rather poor, efforts have 

 been made to replace these devices by automatic tappers or other 



