INSTRUMENTS FOR OBSERVING 31 
ROBERTS RADIO BUOY 
showing 
USE of RADIO CURRENT METER 
Top loaded bamboo pole antenna é 
wound with glass insulated wire 
IMPORTANT: 
yoke plus tieline must not 
exceed length of suspension 
meter lead 
Tirex 23’ 
Tieline 10/.5 
suspension 
15/- buoy to meter 
WE brass chain 
ee ¥4/’ brass Rae for 15’average 
meter depth 
XN 
Overall length of leader, he leader Soe 2-end eyebolt 
" "7 1 ; ? 
2 forte buoy ATG leader can be dispensed with, less than Pz awamel pearclink 
or 120 buoy. 3 knots, meter thus hanging free ee 
FIGURE 21.—Radio buoy and use of radio current meter. 
