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To Recharge This Cell - Fill With Water

The "H2O" Cell, as it is termed by its English sponsors, was introduced to meet the demand for a wet cell smaller and more compact than the "Leclanche," and in this respect it appears to have gained its advantage. This cell may he stored for any length of time and in any climate without any deterioration. It is not liable to creeping or evaporation while in use. Its internal resistance is low, and it does not polarize in use so quickly as wet batteries of the "Leclanche" type, it is claimed.

The addition of water only is needed for charging, and its active life is equal to any high-grade cell of similar size. If the cell is required for instant use, it is recommended that the cell be filled with warm water; distilled water being used, if possible, as this tends tn prolong the life of the cell by reason of the absence of iron or lime impurities, which are Frequently found in hydrant water.

In order that the condition of the zinc electrode and the interior parts of the cell may be examined, the container consists of a clear glass jar. A. ( See diagram.) Into the bottom of this jar some bitumen is poured while in a hot condition. This serves to fix the porcelain base, B, in position.

This base forms the support for the sack, C, keeping it in a central position, and also a support and spacer for the zinc cylinder, D, keeping it always the correct distance from the sack. It is this narrow space between the zinc and the sack which, to a large extent, makes the internal resistance of these cells so much less than Lechanche batteries. The top of the sack has a rubber ring, E, round it in order to further safeguard against the zinc cylinder touching the sack. Above the sack a specially shaped porcelain ring, F, is slipt over the carbon rod. G, and this serves as a support for a waxt cardboard disk, H, which supports the sealing compound. Two holes are arranged in the sealing compound and the cardboard washer ; in one of these is a fiber tube. This tube forms the funnel thru which the water is poured when the cell is required for use, and is normally sealed with a cork. The other hole contains a small glass tube to allow the gases generated when the cell is in action to escape. A lead connection strip, J, is soldered to the zinc cylinder, and this is brought up at the side of the cardboard washer and thru the sealing compound.

This lead strip is provided with a punched hole to allow of connection to an adjacent battery. A brass cap. K, is forced on to the carbon rod, and the nut for wire connections screws on to a pin riveted and soldered, to the cap. The ammonium chlorid crystals, L, are placed in the cell at the time of manufacture: so that all that is ecessary to make the cell ready for use is to remove the cork, fill the cell with water, and replace the cork.

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