Battery acid level indicator

Claim 1

IN COMBINATION, A BATTERY HAVING A CASE DIVIDED INTO A PLURALITY OF ELECTROLYTE-CONTAINING CELLS, EACH OF WHICH HAS A FILLER OPENING; A HOUSING MOUNTED ON THE TOP OF THE BATTERY CASE ABOVE SAID FILLER OPENINGS; SAID HOUSING HAVING A LIGHT-CONDUCTING CHANNEL PROVIDED THEREIN WHICH EXTENDS FROM ONE END OF THE HOUSING TO THE OTHER; A LAMP MOUNTED AT ONE END OF SAID HOUSING TO DIRECT RAYS OF LIGHT ALONG SAID CHANNEL TO THE OTHER END OF THE HOUSING; A PHOTOELECTRIC CELL MOUNTED AT SAID OTHER END OF SAID HOUSING IN A POSITION TO BE ENERGIZED BY RAYS OF LIGHT FROM SAID LAMP PASSING THROUGH SAID LIGHT-CONDUCTING CHANNEL; A PLURALITY OF FLOATS DISPOSED ONE IN EACH OF SAID CELLS, EACH OF SAID FLOATS HAVING A STEM PROJECTING UPWARDLY THROUGH ITS FILLER OPENING; AN OPAQUE FLAG CARRIED AT THE UPPER END OF EACH OF SAID STEMS, SAID FLAGS BEING NORMALLY POSITIONED ABOVE SAID LIGHT-CONDUCTING CHANNEL WHEN THE ELECTROLYTE LEVEL OF THE ASSOCIATED CELL IS ABOVE THE SAFE LEVEL, AND SAID FLAG DESCENDING INTO SAID LIGHT-CONDUCTING CHANNEL WHEN THE ELECTROLYTE LEVEL DROPS BELOW SAID SAFE LEVEL; ANY ONE OF SAID FLAGS BEING OPERABLE TO INTERRUPT THE RAYS OF LIGHT FROM SAID LAMP TO SAID PHOTOELECTRIC CELL WHEN THE ELECTROLYTE LEVEL OF THE ASSOCIATED CELL DROPS BELOW THE SAFE LEVEL; AN ELECTRICALLY ACTUATED INDICATING DEVICE; AND A TRANSISTOR OPERATIVELY CONNECTED TO SAID INDICATING DEVICE TO ACTUATE THE SAME; SAID TRANSISTOR BEING CONNECTED TO SAID PHOTOELECTRIC CELL AND ENERGIZED THEREBY TO ACTUATE SAID INDICATING DEVICE WHEN THE RAYS OF LIGHT FROM SAID LAMP ARE INTERRUPTED BY ONE OF SAID FLAGS.