Show W mill L by j a tr it p cenor u ot radio a n ng I 1 fe tess nis ilaw j fw wely flored glass lube vae A Wc fal fotr j W vie A high voltage storage battery ann tin been urta by the radio laboratory of the bureau of standards etan darda for over four year years and has riven given excellent service many calls have been revived for in formation regarding euch such batteries the particular batteries to be described are used to furnish plate current for a generator of radio fre quency current the ele electron erron tube used li Is either a VT NT 2 or a it type P allo tron from or their equivalent the current for or the first tube may range from IS to 60 80 milliamperes while for the latter tabe tube it may be ISO milliamperes depending oo 00 the plate voltaic voltage used it la Is necessary euary that a constant current of t small value be available elements Elemn te the no individual element elements composing thil this battery are type LT chloride accumulator accumulators the following data are taken from a catalogue discharge ta to am azpr pores miss lf if r T ritt rut camo I 1 dr gilta I 1 ita I 1 1 6 A I 1 II 11 a normal dimensions of weight charge olf olson ju jas la to pounds it at cora core amp aora Ao rJ b forbs ayt tartt alf jets 1 I 1 1 14 N 4 a I 1 the batteries bit teries were made op up using twelve cell cells per row and four rows to the tray iving giving about volt volts when charged the illustration shows the arrangement aa as employed at present with one exception which will be men cloned later wooden trays were made tip up of loch inch lumber measuring by 19 by 4 inches deep lega UP 1 inches long were placed plated at each corner vertical support supports 12 inches high were fastened at each corner comer of the tray so 0 o that the trays might be built up in stacks if desired thus occupying a minimum of floor door or table pace space the ne tray trays were given two coat coats of black insulating tarnish varnish allowing plenty of time for drying between coat coats melted paraffin waa was poured into the tray and allowed to harden the class glass jars the top of which bad been dipped in for about an inch down the aide side were then put in place and one end of the tray blocked up about two inches more paraffin was poured in until it came within about one inch of the top at one end and about three v inches from the top at the other end after the paraffin hardened and the tilting blocks were removed a sloping surface mulled resulted which Is convenient for washing out any acid or dirt A flared dared glass tube was put through the bottom of the tray at the lower end to drain off of any water platea or acid the plates for the battery come in pain con consisting of one positive and one plate joined by a lead link duke the plates going la in adjacent cells and being supported by the lead link the battery was made up to in ucb such a way that its terminals were at the th op opposite endi which tho tray ij Is drained chemically pure sulp sulphuric hurle uric acid I 1 diluted to briar bring the specific gravity to 1210 directions for or mixing the electrolyte may be found la td any handbook on storage batteries the electrolyte in the jan jars should come about ame one fourth inch above the top of the plates paraffin coven covers were mad made for the cells the no majority of coren covers la in use time consist of one long cover for each row of cells the paraffin fla was poured into uto a wooden mold or trough about 1 by inches forming a piece about ozis od quader inch thick while the cover was till still wann warm it was removed from the mold and placed on top of the row of cells where it was pressed down and conformed to the tops two of the jan jars and lead links ticks in the center above each jar a considerable depression was made and still a small hole made for jor gases to escape this method gives a convex surface to the under side of the avet cover to 0 o that th spray fort forming ning when the cell tell is U charging collects on the cover and forma forms droplets which an are returned to the electrolyte As would be expect ed 4 the tb coven covers bay have reduced the evaporation greatly in addition to keeping dust out of the h ellal when the bat teries an are on charge no to spray or fumes are noticeable in the be room terminals nAIL each Jer terminal mInal of each battery cones comes cut out to the blade of a dintle pole double throw switch mounted on the vertical supports of the tny tray the lower terminals of all positive terminal switches are connected together the same belag being true of the negative terminal switches by throwing all of the swi tche downward the batteries are placed in parallel either for obtaining 10 tolls volts or for charging from the toll volt hect current main malus the battain jars re directly to the volt mains MAIN throb small fuses aba dugans na caper per of the BW lichen arp conn convicted connic ted eted in cries series positive to rn clithe and hove have sul suitable table binding poof posts attached to ench pair of witch terminal terminals for the wires from front he the radio frequency generator ily a suitable ul table throwing of switch 8 any voltage a from too to OK may be ob with these batteries batt erlee the vo volt it ace age of coune depenti Is on the number of traye trays operating the larger electron tube three of the bat teries may he be tn in use while the other three are being charged quite a number of these batteries batt erlei have been used by the tile radio laboratory of the bureau of standards and they have been entirely satisfactory for supplying a small constant cont tant current ucb such as its Is necessary for electron tube generators to obtain best results the batteries must be given some attention to see that the jan jars are kept filled ailed with distilled water to a height somewhat above the top of the plate plates and are charged from time to time how often the batteries are charted charged depend depends on how bow much they are used it la is preferable to charge them oftener and keep them well charged than to uie use them to the limit charging them only at wide intervals or when nearly run down the no tray trays should be washed out once in two or three weeks with clean water to remove any collected add acid or dirt maintenance As A bu been previously stated stor age batteries of thi this general type using same some type of element have been tn in use la in the radio laboratory for over four year years while no definite alte dara dats have been collected to how show the useful life of such high voltage bat bit some very conservative estimates may be given the life of such batteries Is to greatly influenced by the tho care air afforded corded them good care includes keeping the jan jars and wax free of add pray spray and dust keeping jan jars property filled oiled keeping within the proper ampere hour charge and discharge rate and if batteries are not non noru nully lally used at the specified discharge rate they should be exercised about every two week weeks by discharging through a resistance at the proper discharge rate and then nai bat of this abl type which have been given proper attention have ben bein in use for over four yean years and arc are yet quite serviceable others have gone to ruin in six months for want of care cart jv radio nw news THE NEW VAMPIRE A WAG A MOAN AND A BLANK DESP DESPAIR Alit with apoloni Ap olotI to rudyard kipling i A fool tool here there was wa and he cot got the tb desire deal M even as you and L ha bought some tubing and lots of wim ire even as you and L go wrapped it round and took off tapa UPS and said the thing may work perhaps even as to you and L A 1 panel he be cot got and then switch points evea even ai as you and L A condenser oo dener next ted and wire for to the joints joint een as you and L ile set net the parts puts op as its per directions and cussed at burnt fingers when lien soldering connections even as you and L 4 ile purchased a tub it cost him 01 ave bucks even as you and L worth 80 30 cents cent sIf U you take em a by looks even u yon you and L an A battery too and still of course coun also a ow what the difference was raw alelle eU hs h see se even as jou you and L he read up on microfarads talked ot of eyen to a you and L but awaa finally dalsby and be put on the phones even as a yon you and L he be listened for day days and nary a soun sound d till some poor fish ash told him he needed a round 1 even AS you and L to radio htwa news mica Cond enters but best during the selection of part parts tor fot the radio set a grid condenser that Is constructed of mica should be chosen paper condensers are not recommended because the capacity varies with the temperature and humidity in many cases the paper rouden condenser have been known to absorb 1 who acal urn |