and engineering journal . DE. HERE IS THEDAVIS - BIRAMANEMOMETER. It is constructed on the principleof the revolving fan, and offersseveral advantages over its pre-decessors. The air enters, asusual, from the back of the in-strument, and instead of passingin a straight line through theprotecting ring, is deflected out-wards by a cone through port-holes. The friction of the airpassing through the instrumentto the outer air is practically constructed, it is possible tobring the instrument in front ofthe operator, and experimentshave proved that, if held the body, there
and engineering journal . DE. HERE IS THEDAVIS - BIRAMANEMOMETER. It is constructed on the principleof the revolving fan, and offersseveral advantages over its pre-decessors. The air enters, asusual, from the back of the in-strument, and instead of passingin a straight line through theprotecting ring, is deflected out-wards by a cone through port-holes. The friction of the airpassing through the instrumentto the outer air is practically constructed, it is possible tobring the instrument in front ofthe operator, and experimentshave proved that, if held the body, there is no hind-rance I I he free current of air,and that the accuracy of thereadings is not interfered , what was previously con-sidered impossible has beenachieved. The Davis Biram Ane-mometer has several other distinct advantages which places itahead of all others. May wesend you full particulars?Sole Agents for South Africa : BARTLE&CO.,LTD. Loveday House. Box 3468. Phone 3553. at KIMBERLEY and I burg, November 26, L921 THE MINING \\H ENGINEERING JOURNAL. We The Shale and Coal Oil Industry. SOME NOTES ON ITS EARLY HISTORY AND DEVELOPMENT SOUTH AFRICA. A SUBJECT OF GREAT IMPORTANCE TO We are indebted fco Messrs. A. F. Craig & Co Ltd.,Caledonia Engine Works, \, for the following mi. n Iing notes on the earlj historj oi the shale and coal oilindustry. In sending us these notes, Messrs. Craig & : — Ynii have published several informative articles on theshale oil industry, indicating thai there is wide inteitherein, unil, in particular, thai the working el the Natalshales is under consideration. We have reason to I lii vethai in some districts the local conditions there are morefavourable than those with which the Scottish industry issurrounded. For instance, the shale is more easily mined,.?ind the residue after treatmenl more easilj disposed ofThe oil contents are greater [mported oil is handicappedh\ freighl charges and im
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
