R 
2 Figure 1.--Series and series parallel 
circuits. 
A. Ry = manual variable potentiometer 
A SERIES (30,000 ohms); R, = microammeter 
or microampere recorder (7400 ohms). 
R, = manual variable potentiometer 
(35,000 ohms); R5 = shunt resistor 
(200 ohms); Ra— microammeter or 
microampere recorder (7400 ohms). 

B SERIES PARALLEL 
CL 505 L 

Figure 2.--Actinometer or dew recorder circuit. CL505L = cadmium-sulfide 
cell; R,= Sigma 5ss 50-ohm relay; Bl1O= International Rectifier selenium sun 
cell; Ry — O-50 ohm, trimmer potentiometer; Ae = 0-500 ohm trimmer potentiometer; 
at 
S, = 3 position shunt switch; 52 = on-off switch. 
Slee 
