ROBERTS RADIO 

 CURRENT METER 

 II 1 MODEL 2 



velocity signa 



THE ROBERTS RADIO CURRENT METER (A2) is streamed from a buoy 

 (Al) anchored at the desired station and containing a battery-operated radio 

 transmitter and antenna. It is suspended below the buoy at the desired 

 depth and is connected by an electric cable. As the meter aligns itself in 

 the direction of flow its impeller reacts to the flow actuating an interior 

 contacting mechanism (B) which in turn communicates to the buoy, where the 

 radio transmitter is keyed to produce radio signals indicating current direc- 

 tion and velocity which are received, amplified, and recorded at a radio 

 station ashore or afloat. The details of the contacting sequence as actuated 

 by the contacting mechanism (B) are shown in Figures C. D, E, F. 



coinciding signals 



96 



Figure 9-5. Roberts radio current meter, Model 2. 



H. O. 607 



