Evening star., 1922-06-14

merits such as is used for drop lights
or electrical fiat irons or stoves, you
can make the connection quickly.
In this case however. be sure TO
mark which of the two plug holes on
the cord is negative and which posi-
! tiCe. so that no mistake Will be made.
Remember also 10 switch off the
electric light circuit from the wires
/ in the house when tapping them 1or'
the wires to the posts DID and IN
| Sulate the joints or connections where
| the wires to ID join the house wires
| with adhesive tape wound around
/ them.
! To charge battery with an alter
mating current you must first make
= reCtitier. This is merely two one
! pint fruit jars filed with boraX solution
| in which aluminium and lead plates are
| immersed. The aluminium and lead
strips should be as long as the Jars
are high. about an inch in width and
| about one-eighth of an inch thick.
| BY bending over half an inch or so
| of one end of each these strips. or
/ electrodes may be suspended in the
jars with binding posts attached TO
them as illustrated. The best method
| is to fasten them to baklite or hard
rubber squares by means of binding
posts as shown in the cut, spacing
them far enough apart so they are
! close to the opposite sides of the jars
| as shown. The jars should then be
1
water in the proportion of about one
pound of borax to quart of hot
| water. Stir the horaX until thor
oughly dissolved, keep adding more
| boraX until the water refuses to dis
| solve it and then allow it to settle.
! Then pour the clear liquid into the
| jars. being careful not to pour in
! any of the sediment, and fill the jars
To within an inch of the tops. Each
j jar should contain one lead and one
4
the positive in each case. The two
! binding posts of the two lead strips
should then be connected with one
wire CD and the two aluminium bind
| ing posts to another Wire tG).
| Connect the wire @ to. 1O0-Watt
| light and carry another wire CD from
the light to the contact of a double
pole switch. fastening the wire j to
! the same contact point. and then,
turning on the electrict light circuit.
| let the current flow for few hours
| to form" the plates. Be very care
full not to put your fingers in the
| jars or touch any wire or terminal
during this time or YOU may get
dangerous or perhaps fatal shock.
! After the current has been running
for several hours-overnight will do
| turn off and disconnect the wire l
! from the switch contact, HI, and con-
| meet it to the other one. k2. Then
connect your battery to the switch
arm posts. being very sure to have
the positive post of the battery
marked ~" led to the side which
will connect with the wire from the
| aluminium plates, and turn on the
! current and the switch ana let your
battery be charged If the battery is
all run down it will take a long time
to recharge it, as only very small
current will pass through the rectify-
| ing jars. The rate of this will he
! somewhere around two amperes. and
| hence if you have a forty-ampere
hour battery and it is completely
exhausted and the normal charging
rate for the battery is six amperes,
| the current must be kept on the bat
| terry for about twenty hours.
! If you do not wish to have your
battery held up for a day or more.
you should recharge it every day or
two, attaching the battery to the
charging apparatus at night and let
| ting it run until morning. In addi-
tion to recharging. your storage bat
terry must also be kept filled with
water to about half an inch above
the plates, which are visible through
| the filler holes. Use only pure dis
| titled water for. this purpose and
use nothing but clear water in re-
filling the rectifler jars. as the solu-
! tion evaporates. When, after con-
siderable use, the plates of aluminium
/ becomes thin and eaten away, replace
them with new strips.