E/MJ : engineering and mining journal . A* Crank G Back Plqte Extension B- Feed Screw-Nut Nut H-Piston Mammer M Front head Spacer C • Back Mead Gland I - Wa+er Tube N Rifle Nut D-Back Mead J - Feed Screw Nut 0 Chuck Ratchet E- Lubricator K-Feed Screw P Pawl T- Barrel L-Mounting Slide Q Chuck End R - Chuck Sleeve S • Chuck Bushing T- Chuck Driver li-Guide Shell •/ Pawl Spring Plunger »« Pawl Spring SECTIONAL VIEW DREADNAUGHT DRILL. SHOWING PARTS De ember 9, 1916 ENGINEERING WH MINING .101 R avoiding i1 i ?? , ing illustral shov . raeter whosi ness is evidenl accurately measui n . lantitj of Ere
E/MJ : engineering and mining journal . A* Crank G Back Plqte Extension B- Feed Screw-Nut Nut H-Piston Mammer M Front head Spacer C • Back Mead Gland I - Wa+er Tube N Rifle Nut D-Back Mead J - Feed Screw Nut 0 Chuck Ratchet E- Lubricator K-Feed Screw P Pawl T- Barrel L-Mounting Slide Q Chuck End R - Chuck Sleeve S • Chuck Bushing T- Chuck Driver li-Guide Shell •/ Pawl Spring Plunger »« Pawl Spring SECTIONAL VIEW DREADNAUGHT DRILL. SHOWING PARTS De ember 9, 1916 ENGINEERING WH MINING .101 R avoiding i1 i ?? , ing illustral shov . raeter whosi ness is evidenl accurately measui n . lantitj of Eree i ? to 800 i per thi almost any type of machine around a mine. Ii required to measu of these meters ma rallel. This meter is intei dedwhose air consumption :, [\ js attached in ei suitable shorl com ectio n such a manner thai th the meter : entering the drill. Ii is a positive displace™that is, no air can gel through it without actually occupy-,ing the cylinder sp u e \ r entei i. CLARK COMPRESSED-AIR METER connection at the righl em . exhausting a1 the lefl end andpassing on to the drill. In i I Eorces a ? full stroke in alternate directions so thai the quantity oJair passing per minute volume of the cylinder multiplied by the strokes. The strokes i tically recorded by a simple counter on the left-hand end, thecover being shown removed in the illustration. Knowingthe number of reciprocations and noting the gaas well as temperature of the air, simple calculationsquickly give the cubic feel of free air per minute. This meter will appeal to ties in .vhieh air is furnished to numerous grot i and to company employees where it is desii i ertain how the [lower is i stributed. Anoth usefulness will also be found for it in detecting open linesand leaky pipes. PoiPtaSsle IPlaalir® ft© AftEssisaffMnBa<BB §n)bes»a&. Transportation i I factor in most mining operatioi :! at any new phase of this sub-ject is of interest. The Atbasar mines of the Spasskyc
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
