I impact plunger 



2. Test specimen 



3. Housing 



4. Rider with guide rod 



5. Scale 



6. Pushbutton 



7. Hammer guide bar 



8. Disk 



9. Cap 



10. Two-part ring 



1 1. Rear cover 



12. Compression spring 



13. Pawl 



14. Hammer mass 



15. Retaining spring 



16. Impact spring 



17. Guide sleeve 



18. Felt washer 



19. Plexiglass window 



20. Trip screw 



21. Lock nut 



22. Pin 



23. Pawl spring 



A. Front fixation of 

 impact spring 



B. Rear end of impact, spring 

 engaged to hammer mass 



Note: 



(a) Plunger (I) in 

 impacted position 



*^rr 



T^ 



*M&3>$i 



Figure 9. Cutaway view of Schmidt Hammer, Model 

 RM 710, Type L. 



40 



