UPPER. Dr. C. W. Lamp- 

 son and Captain A. E. 

 Uehlinger inspect a rup- 

 tured-foil type gage for 

 recording peak pressure 

 in air. Ten aluminum foil 

 disks of different size are 

 visible. LOWER. Pendu- 

 lum type inclinometer for 

 automatically recording 

 angles of roll and pitch 

 of target ships. Records 

 consist of scratches on the 

 polished aluminum disks. 



Plate 12 



