STATE GEOLOGIST. 255 
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Fiq. 32. Jaw crusher of the Blake type. 
been assembled by Prof, Richards, in his work on Ore Dressing as follows: 
Sizeotmouthimunehesiens ses foe ASSO FT lO Osa lOrxeZ0r ils x 30 
Tons crushed in 24 hours....... 84 120 192 300 540 
Orse Owe esc ers ae ee 5 8 12 20 30 
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Cosnomonreakxena ea ae $275 #500 $750 
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Cost in cents per ton for oil...... O2O21 | OF0215 | 0.021 
Cost in cents per ton for interest | 
ACS Oc lsh OA | Mpiia’ | 
and depreciation....:....-.... | O 0.135 
Cost in cents per ton for laior....| 2.762 | 8.888 | 2.088 | 1.688 | 0.741 
Cost in cents per ton for power...| 0.773 | 0.865 | 0.811 | 0.865 | O2721 
Cost in cents per ton for wear....| 0.815 | 0.815 | 0.815 | 0.815 | 0.815 
Cost in cents per ton for repairs. .| 0.462 | 0.462 | 0.462 | 0.462 | 0.462 
Reval cost a cants wer Mon... 5. O.G8O | Gal | Lene MeL | eos 
‘These estimates, however, are based on hard materials and hence are 
rather higher than the cost of crushing limestone. 
