Tirex S J. Jr. 16-2, 
5/16''dio. 
Beoring holder 
. Housing (spun copper). 
Connection with 1/32” fiber gasket. 
Expansion chamber, bellows type, nickel silver. 
. Water and oil proof cable attachment fitting. 
Impeller. 
g. Impeller bearings, lignum vitae. 
. Impeller adjustment locknut. 
. Forward bearing holder locknut. 
Case containing impeller part of magnetic drive. 
. Transmission gear. 
. Drive shaft. 
. Drive shaft thrust bearing, 
Ree eS SS @ Rie = R 
Toil 
Magnetic Drive 
q Kos Compass 
= 
UZ ZZ) 
Oil filled 
O 
Lead Ballast 
Bolonce 
weight 
O 
. Compass upper guide bearing, 
. Velocity contact point. 
. Planetary contactor. 
. Transmission spindle lower bearing, 
0, 
p. 
q. 
Tr 
8. 
ft 
u 
v. 
w. 
z. 
Transmission spindle. Scale - Inches 
Compass cardan ring. SS 
mp: lan ring f ; z : i z 
U.S. COAST AND GEODETIC SURVEY 
ROBERTS RADIO CURRENT METER 
Sketch Showing Mechanical Arrangement 
Spring contact clip. 
Direction contact points. 
Terminal block lugs. 
Base gear. 
878447 © - 50 (Pace p. 34) No. t 
Fiaure 25.—Radio current meter, original model. 
