A professional who inspects parts for defects in finish and dimensions, using machine that projects magnified shadows of parts on screen. Responsibilities include:

• Reads specifications of part to ascertain form and degree to be magnified.
• Draws enlarged outline of part to scale on chart (celluloid disk), using scribers, dividers, and straightedge.
• Places chart over translucent glass disk of comparator (shadowgraph) machine.
• Inserts specified lens into machine and adjusts mirrors to magnify parts.
• Positions and secures parts on machine table.
• Turns light on and moves levers of machine to bring shadows of parts into focus with chart outline.
• Inspects shadows for imperfections of finish and incorrect dimensions.
• Prepares reports of findings.
• May rotate part in holding fixture to examine surfaces and to verify concentricity of parts.