Xo. filllliT. 



Alternating Current Rectifiers. 



863 



61 065 B. 



61 065 A. 



61 065 C. 



Single-Phase Alternating Current Electrolytic Rectifiers, Figs. A C, for converting single 

 phase alternating current up to 120 volts into Direct Current; also for connecting up 

 to one phase of a 3-phase system: comprising 4 cells, 1 insulating stool, 1 starter and 

 electrolytic salt sufficient for one charge. Fig. 61,065 A shows the complete rectifier, 

 61,065 B the arrangement of a cell, and 61,065 C the method of connecting up. 



List No. 61,063 61,064 61,065 61,066 61,067 



Max. load Amps. 5 10 25 50 100 



Constant load Amps. 1 2 5 10 20 



3.15.0 5.0.0 8.15.0 11.5.0 18.15.0 



Each rectifier for A. C. consists of 4 cells each with an aluminium electrode in a solution of 

 electrolyte salt, these cells allowing the current to flow in one direction only. By a suitable system 

 of connections aU current rushes flow to the supply terminals in the same direction; a Direct Current 

 is thus obtained. The method of connecting up for monophase A. C. is shown in Fig. 61,065 C for 

 120 volts. Each cell is suitable for rectifying 60 volts, so that the connections shown in Fig. 61,065 C 

 are thus arranged for 120 volts, as only two cells are in series. By putting more cells in series a pro- 

 portionately higher voltage is obtained and by connecting in parallel a higher current. A controller-starter 

 is used for working the rectifier, this device consisting of a number of glow lamps, a short circuit switch 

 and 2 connecting terminals for the A. C. lead. The A. C. switch should be closed when the short 

 circuiting switch is open; the lamps then burn brightly until the cells have formed. As soon as the 

 lamps become dim the forming is finished, the short circuit switch is closed and Direct Current can then 

 be taken off. The D. C. thus obtained can be used forthwith for most purposes, e. g. for charging 

 accumulators, exciting magnets, working X-ray apparatus with Wehnelt interrupters, etc. The use of 

 a Condenser Cell, F i g. 61,084, is only necessary where a Direct Current of absolutely regular voltage 

 is required. In conjunction with a cell of this kind the rectifier can be used with advantage for working 

 a D. C. Arc Lamp in conjunction with an A. C. Network. 



The D. C. voltages are approximately as follows for the sizes for 25 amps, maximum load: 



Direct Current Supply Amperes 



Volts 



Alternating Current, 110 volts 50 cycles: 

 D. C. Pressure 



3-Phase Current, 120 volts, 50 cycles: 



D. C. Pressure . Volts 







135 

 167 



1 5 



112 96 



152 141.5 



10 

 92 

 139 



86 

 134 



For charging acrumiil;ilors a proportionate number of resistances should be put in series when 

 the number of cells is smaller (e. g. Nos. 61,015 61,018). 



s. d. 



C). 43111, 5874, 439'2. 



