446 APPLIED SCIENCE 



7. When are mahogany and cherry used? 



8. What is a flask? 



9. What is the lower part called? 



10. What is the upper part called? 



11. What is the drag, cheek, or cope part of a pattern? 



12. When is a metal flask and pattern used? 



13. What is the core? 



14. What is a core-box? 



16. What is molding sand? Name the different kinds. Why 

 are they used? 



16. What is a core-print? 



17. What is a gate? 



18. Why are patterns built up of pieces of wood rather than 

 one piece? 



19. Name the two methods of building patterns. State 

 advantages of each method. 



20. What is a fillet? Why is it used? 



21. Why are some patterns made in sections? 



22. How are patterns taken from the mold? 



23. What is a riser? Why are they used? 



24. What is a feeder-head? 



25. What is meant by venting a mold? 



26. What is a chaplet? Why is it used? 



