Waterproof Dry-Battery Case
Batteries Protected by a Waterproof Case will Give Longer and More Efficient Service
Batteries Protected by a Waterproof Case will Give Longer and More Efficient Service
Dry batteries that are sealed in a tight, waterproof case will last much longer than those exposed to dampness, especially in marine practice. A box, like that shown in the sketch, will afford excellent protection and add materially to the life and efficiency of batteries. It is constructed of ¹⁄₂-in. cypress, or oak, of a length and width depending upon the capacity in number of cells desired. The inside dimensions should be such that the cells are firmly fitted. It should be put together with screws and marine, or any other waterproof, glue. The batteries should be placed in the case and connected. Molten paraffin wax should then be poured over and under the cells. Do not get the wax too hot, but heated only to the melting point. Bindingposts and a single-blade switch should be placed on the case and connected up. Screw on the cover, after painting the top edges with the glue. Give the case a good coat of varnish and paint, and fit with a carrying handle. This makes a neat and handy battery outfit that is thoroughly waterproof. The case can be refilled by cutting out the wax and removing the old cells.—B. F. Dashiell, Baltimore, Md.