Assertion: lamp | /r/AtLocation | general and careful use
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text: Work carried out by a scientific witness and reported by the committee showed that the Davy lamp became unsafe in airflows so low that a Davy lamp carried at normal walking pace against normal airflows in walkways was only safe if provided with a draught shield:13–17 (not normally fitted), and the committee noted that accidents had happened when the lamp was "in general and careful use; no one survived to tell the tale of how these occurrences took place; conjecture supplied the want of positive knowledge most unsatisfactorily; but incidents are recorded which prove what must follow unreasonable testing of the lamp; and your Committee are constrained to believe that ignorance and a false reliance upon its merits, in cases attended with unwarrantable risks, have led to disastrous consequences":131 The "South Shields Committee", a body set up by a public meeting there (in response to an explosion at the St Hilda pit in 1839) to consider the prevention of accidents in mines had shown that mine ventilation in the North-East was generally deficient, with an insufficient supply of fresh air giving every opportunity for explosive mixtures of gas to accumulate.:28–36[c]