and engineering journal . £ or atotal of £916,429. DAVIS-MADE MEANS HIGHEST GRADE. HERE IS THEDAViS - BIRAMANEMOMETER. It la constructed on the principleof the revolving fan. andBeveral advantages ovei its pre-decessors. The air enters, asusual, the back of the in-strument, and instead oiin a straight line through theprotecting ring, is deflected out-wards bj a cone througholes. The friction of the airpassing through the instrument iter air is practically constructed, it is possible tobring the instrument in front >>fthe operator, and experimentshave prove
and engineering journal . £ or atotal of £916,429. DAVIS-MADE MEANS HIGHEST GRADE. HERE IS THEDAViS - BIRAMANEMOMETER. It la constructed on the principleof the revolving fan. andBeveral advantages ovei its pre-decessors. The air enters, asusual, the back of the in-strument, and instead oiin a straight line through theprotecting ring, is deflected out-wards bj a cone througholes. The friction of the airpassing through the instrument iter air is practically constructed, it is possible tobring the instrument in front >>fthe operator, and experimentshave proved that, if held ismfrom the body, then is no hind-rance to the free current of that the accuracy «f is not interfered , what was previously con-sidered impossible has beenachieved. Th. m Ane- mometer lias s.\. i al other dis-tinct advantages which places itahead of all others May wesend you full particulars?- BARTLE&CO.,LTD. Loveday House. BoxBe Phone 3553. JOHANNESBURGAnd it KIMB1 U! w md D1 714 THE MINING AND ENGINEERING JOURNAL. Jburg, January 21, L922 SPECIAL VENTILATIONIN MINES
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
