. mining and engineering journal . atal (JoMMininenduslry. £ 622 Rase Works, r.£ £ £ £ £ 147,504 44,917 • 660 30,977 658,155 — — 248 2,963 416,340 rnioM of South Africa 14, Year 1916Year 1915 Year 1914 Year 1915 Year 1912 Year 1911 12 320 502 139 521 617,819 277C87 643,158 291J79 ,
. mining and engineering journal . atal (JoMMininenduslry. £ 622 Rase Works, r.£ £ £ £ £ 147,504 44,917 • 660 30,977 658,155 — — 248 2,963 416,340 rnioM of South Africa 14, Year 1916Year 1915 Year 1914 Year 1915 Year 1912 Year 1911 12 320 502 139 521 617,819 277C87 643,158 291J79 , ,151 , 14, 714 MINING JOURNAL AND ENGINEERING RECORD. Jburg, March 30, 1918. -i-i_ ( I HYDROMAX New Water Hammer Drills tosupersede Reciprocating Drills. >f (A 9 a o 4) H fi • p4 >• In Q G a ta .S CA (8 bfl .s o CO uo «4N 4> *-N pJD(Q M !;;--i^ f. D^?^ CO o S. > 9 n o g £ i p- s s 5 0 No Mine Manager can affordto neglect the economicmerits- of the - - - - •HYDROMAX 9 The Fastest Rock Drillin the World. We have exclusively manufactured drills for thirty-seven years and the HYDROMAX is our crowning effort. THE CLIMAX ROCK DRILL & ENGINEERING WORKS, Ltd., CARN BREA, CORNWALL (Wm. C. Stephens. Managing Director). fsss Agents—Phones 4113/ 9. Box 667. JOHANNESBURG. Telegrams: ^t^^^^^^a^ M«l ?? ? ta •Tbwrg, March 30, 1018. MINING JOURNAL AND ENGINEERING RECORD. 715 THE ESTIMATION OF INJURIOUS DUST IN MINEKOTZE KONIMETER.*—II. AIR BY THE [liv John Ixnrs. I Thr )fi fi7>(l thf Mff/iof/ of Counfin//.—Tim sta^e of tl:<-microscope should he marked off .so that spots may he readily difficulty may be experienced in obtaining the correct combination of objective and eyepiece. The size of the field depends on theobjective and on the tube length, and it should lie at lea
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
