cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1030000765/1030000765_02.pdf · fixation of the...
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cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1030000765/1030000765_02.pdf · fixation of the instrument. The thermometer must remain in position 15—20 minutes before the mercury