The Holly chieftain., 1923-11-01

vi loi VNCi tout
years. and has given excellent service.
Many calls have been received for in
formation regarding such batteries.
The particular batteries to be described
are used to furnish plate current for
II generator Of undamped radio-fre-
quency current. The electron tube
used is either vT-2 or type P plio-
iron. or their equivalents The current
for the first tube may range from ; to
80 milliamperes. while for the latter
tube 1t may be $50 milliamperes. de
pending on the plate voltage used. It
is necessary that constant current
OF small value be available.
Elemen1.
The Individual elements composing
this battery are type LIT chloride ac-
cumulators. The following data are
taken from q catalogue.
size of Number For
E Type ,na,;~ nla,s of plstes q Hrs. sHfs. sa...
chars. Glass Jar in Found.
Amperes Length width Height iyts piets
4 is ~" ih~ 4X" is x
The batteries were made up. using
twelve cells per row and four rows to
the tray. giving about 100 volts when
charged. The illustration shows the
arrangement as employed at present.
with one exception. which will be men
ffnnnd tofn H.,
up Of A-inch lumber measuring llA
by 10 by 4 inches deep. Legs tx
inches long were placed at each cor.
ner. Vertical supports II inches high
were fastened at each corner of the
rray 80 that the trays might be built
UP in stacks If desired. thus occupying
minimum of floor or table space. The
trays were given two coats OF black
Insulating varnish. allowing plenty Of
time for drying between coats.
Melted paraffin was poured into the
tray and allowed to harden. The glass
jars. the top Of which had been dipped
in paraffin for about an inch down the
side. were then put In place and one
end OF the tray blocked UP about two
inches. More paraf1in was poured In
until II came within about one inch
of the top at one end and about three
inches from the top at the other end.
After the paraffin hardened and the
tllting blocks were removed slopIng
surface resulted which Is convenient
for washing out any acid or dirt. A
'iared glass tube was put through the
bottom of the tray at the lower end to
drain of any water or acid.
Plates.
The plates for the battery come In
pairs. consisting Of one positive and
one negative plate Joined by a lead
link. the plates going In adjacent cells
and being supported by the lead
link. The battery was made up in
such way that Its terminals were at
the opposite end from which the tray
Is drained.
Chemically pure sulphurlc acid is
diluted to bring the specific gravity to
1910. Directions for mixing the cleo
trolyte may be found in any handbook
on storage batteries. The electroIyte
In the Jars should come about one
fourth inch above the top of the plates.
Paraffin covers were made for the
cells. The majority Of covers In use
consist Of one long cover for each row
of cells. The paraffin was poured into
a wooden mold or trough about III by
1SA inches, forming piece about one
quarter.inch thick. While the cover
was still warm, 1t was removed from
the mold and placed on top Of the row
Of cells. where 1t was pressed down
and cOnformed to the tops OF the jars
and lead links. In the center above
each jar considerable depression was
made and small hole made for gases
TO escape. This method gives convex
surface to the under side of the cover,
so that the spray forming when the
cell is charging collects on the cover
and forms droplets which are returned
to the electrolyte. AS would be expect
ed, the covers have reduced the evapo-
ration greatly In addition to keeping
du't out OF the cells. When the bat.
teries are on charge no spray or fumes
are noticeable in the room.
Terminals.
Each terminal Of each battery comes
out TO the blade Of single-pole double
throw switch mounted on the vertical
supports Of the tray. The lower ter
minals Of all positive terminal switches
are connected together. the same be-
ing true Of the negative terminal
switches. BY throwing. all of the
switches downward, the batteries are
placed In parallel either for obtaining
100 volts or for charging from the ITO.
volt 5!rect current mains. The bat.
teries are connected directly to the
l10-volt mains through small fuses
when charging. The unper terminals