Hudson Super Six 1916, Reference Book

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Hydrometer Syringe
We recommend that every Hudson owner carry One Of these useful instruments at all time s - especially if it
is impossible for him to obtain regular inspection of the battery through his dealer.
This instrument is for testing the specific gravity of the electrolyte of storage batteries. it is shipped
unassembled, carefully packed in a substantial wooden box.
To assemble, hold the glass barrel, to which is attached the rubber bulb, in a horizontal position, and insert the
hydrometer stem end first. Wet the soft rubber plug which is attached to the hard rubber pipette (nozzle) and
FORCE RUBBER PLUG, grooved end first, into the end of the glass barrel as far as it will go, or until it strikes
the shoulder in the barrel. It is important not to force the pipette too much in making this attachment, as the end of
the pipette must not extend beyond the base of the grooves of the rubber plug-otherwise the flow of the electrolyte
will be retarded in emptying the hydrometer syringe.
Directions for Using
After removing the filling plug from the cover of the cell, compress the rubber bulb of the syringe and insert
the pipette in the solution of the cell to be tested. Holding the instrument as nearly vertical as possible, gradually
lessen the pressure on the bulb until the electrolyte rising in the barrel causes the hydrometer to float. In general,
only enough electrolyte should be drawn to float the hydrometer free of the bottom by about one-half to
three-quarters of art inch. The specific gravity reading is taken on the hydrometer at the surface of the electrolyte
in the glass barrel.
If the electrolyte is below the top of the plates, or so low that enough cannot be drawn into the barrel to allow
of a proper reading of the hydrometer, fill the cell to the proper level by adding pure water; then do not take a
reading until the water has been thoroughly mixed with the electrolyte. This can be accomplished by running the
engine for several hours.
The specific gravity of the electrolyte is an indication of the amount of charge in the battery. In a fully
charged battery the specific gravity should be from 1.275 to 1.300. Gravity above 1.200 indicates battery more
than half charged. Gravity below 1.200 and above 1.150 indicates battery less than half charged.
(When in this condition, use lamps sparingly until, by charging the gravity - restored to at least 1.200. Gravity
below 1150 indicates battery completely discharged. An exhausted battery should be given a full charge at once.)
Hydrome
ter
syringes
are not a part of the electric system, but can be purchased from the Hudson Motor Car Co., or from The Electric
Storage Battery Co., Philadelphia, Pa.
The water for filling the batteries must be pure
Distilled Water,
Melted Artificial Ice, or
Fresh Rain Water.
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