432 



CEMENTS, LIMES, AND PLASTERS. 



The estimate (see Table 177) of the cost of crushing with a Gates 

 crusher is based by Professor Richards on the results of a number of 



FIG. 88. Sectional view of Gates crusher. 



The names of the several 

 found in the following table: 



1. Bottom plate 



2. Bottom shell 



3. Top shell 



4. Bearing-cap 



5. Oil-cellar cap 



6. Spider 



7. Hopper 



8. Eccentric 



9. Bevel-wheel 

 10. Wearing-ring 



parts designated by numbers in the above illustration may be 



11. Bevel-pinion 



12. Band-wheel 



13. Break-pin hub 



14. Break-pin 



15. Oil-bonnet 



16. Dust-ring 



17. Dust-cap 



18. Head 



19. Concaves 



22. Chilled wearing-plates 



24. Octagon step 



25. Main shaft 



26. Upper ring nut 



27. Lower ring nut 



28. Steel step 



29. Lighter screw 



30. Lighter screw, jam nut 



31. Counter-shaft 

 33. Oiling-chain 



mill tests at ore-treatment plants. As the ore handled at these mills- 

 was, in general, harder than the raw materials used in Portland-cement 

 manufacture, allowance should be made for this feature. 





