Storage batteries as usually constructed are comparatively heavy and the yield of ampere hours is very small per pound of active material used. The accompanying engraving illustrates an imjiroved storage battery which provides for considerable increase in electrical storage capacity, and a material redtiction of the weight of this cell. The battery consists of a glass cell. A, formed with a central rib and ledges on the side walls adapted to support the positive electrode, B. This is in the form of a carbon grid comprising the longitudinal bars C and D connected by a series of cross bars. In the upper face of bar G a condtictor ? is imbedded. This conductor is held in place by means of a zinc cap electroplated on. The zinc is covered by a coat of paraflSn, Resting on the positive electrode ? is a frame which carries on its under side a corrugated plate, I made of hard rubber. Supported on the upper side of the frame is a flat plate G, also of hard rubber. Between these plates a chamber is formed which is filled with asbestos. The plates F and ? are perforated to provide escape for the gases generated. The fiber wall serves to mechanically assist in keeping the different solutions of the cell separated. Resting on the plate G is the negative electrode ?, which is also preferably made of carbon in the form of a grid. This grid is also provided with a conductor imbedded and sealed in place. The chamber beneath the positive electrode ? is completely filled with carbon tetra-chlorid, bromoform, chloroform, or any liquid solvent of bromin of which the specific gravity is greater than a solution of zinc bromid which is thereafter poured into the cell to fill the interstices and cover the greater jjortion of the upjjer electrode. In charging the battery, zinc from the zinc bromid solution is deposited upon the electrode ?, and bromid is liberated at the electrode B, and since it is of higher sijecific gravity it falls to the surface of the carbon tetrachlorid, or other solution used, said solution having the property of extracting bromin from the l)romid solution. When the cell is completely charged the spaces between the lower carbon electrode are filled nearly to the top with a solution of carbon tetra-chlorid and the bromin liberated from the zinc bromid at this point. When the cell discharges the bromin is withdrawn from the solution of carbon tetra-chlorid and the zinc deposited on the negative electrode is combined therewith to again form zinc bromid. Mr. Homer E. R. Little, of 1403 Webster Avenue, New York, N. Y., is the inventor of this storage battery. Brief NotcN C'oiiecriiiiig PaleiitN. A report received from the United States consul at Gothenburg, Sweden, announces the invention of a iiiiniature head telephone, which it is said will be of great value not only to telephone operatorg, but to persons whose hearing is defective. The invention is that of the chief of the Swedish government telephone department. The receiver measures one-half by five-eighths inch; and over the diaphragm may be screwed a cover continued into the ear-tip. The connection to the receiver may be a fine flexible cord, no heavier than an eyeglass cord. No helmet or other attaching device is required to hold the receiver in place. In the oijeration of large office buildings and similar establishments, there is a constant demand for keys. Where locks of the pin-tumbler cylinder type are used, this is a serious matter, for the keys are not interchangeable as with the ordinary kind, and there is no cliance of finding a stray key in a bunch which will open a lock. New keys must be made constantly. 'I'hen again the flat keys used on the modern locks are difficult to duplicate, so that the services of a locksmith or at least a good mechanic are required, A very ingenious and effective device to meet this condition has been recently invented. It is a key-filing jig, a neat little apparatus consisting principally of a plate 2% by 2i inches,.and means are provided for securing a ijattern at one jjoint with the key blank directly above it. A gage-]nn with a vertical and horizontal movement travels in a slot between the two keys, and this is also provided with the means of being secured at any point. The bottom end of the pin being placed in the cutting of the pattern key, acts as a guide for cutting the blank without any possibility of cutting too deep into the blank. Two of these pins are furnished with each jig to meet the different demands of the work, but only one i)in is used at a time. With such assistance, anyone who can handle a file can make a key with little trouble.
This article was originally published with the title "A New Type of Storage Battery"