Show hints to miners on fire bulkheads 0 from a recently issued bulletin of the united states bureau ot of minos mines have been taken the following to miners who say when en trapped as the result of mine miner tires fires shut themselves in crosscuts by erecting bulkheads I 1 when entrapped by gases gase sand and forced back into a crosscut or drift in which Is comparatively good air keep in mind the thought of build ing a bulkhead and collect tools timber water and other necessities in the way 2 before constructing a bulk head make sure that there la Is no manway or other connection with another level through which lumps f u s 1 could come also see that the d drift mal f t is not in broken ground or sloped through from a lower level leve I 1 and back filled with loose material through which gas could find its way even it if a tight bulkhead be made and these conditions are present the area will soon I 1 fill ill with gas 3 under these conditions wita from 8 to 29 men employed a bulk head may be put up in from one to four hours time 4 when erected toi test a bulk head for leaks by means of a candle or carbide lamp 5 it if there Is a compressed air pipe with hose attached leading into the drift and gas Is coming in dur ing erection of the bulkhead station a man blowing air to keep back the gas 6 use a minimum of lights when in a bulkhead region as these consume oxygen 7 the burning of the flame of a candle or lamp will show the con of the confined air and how the oxygen Is 1 being used up 8 keep moving in the drift as much as possible sd as to mix the air and do not gather in one place 9 A bulkhead drift feet long and 6 feet high by 6 feet wide contains 9 cubic feet of air and at the disastrous tire fire in the north butte mining company s granite mountain shaft kept 29 men alive tor for 36 hours and one feet long and 7 feet high by 7 feet wide con 6 cubic feet supported 6 out of 8 men for fifty hours and aou would id have sufficed tor for all 8 men tor for 65 hours it if the air bad had been circulated by moving about |