81. How can you keep the gage screw wheel graduation true?
82. Give the four devices which safeguard the knife.
83. What are the things to study in handling stock?
84. What can you say about each of these things?
85. What are the causes of inaccurate cutting when the machine is in good order?
86. What care should be taken in piling sheets?
87. What precaution is necessary in cutting printed sheets?
88. What is a mill edge and what does it require?
89. How can exact register and accurate trimming be secured?
90. How may a pile be tested for squareness?