A professional who etches numerals and graduation lines on prisms and other optical glass surfaces for use in optical instruments, using pantograph engraver. Responsibilities include:

• Mounts glass specimens in holder.
• Dips glass elements in molten wax to obtain uniform protective coating.
• Positions tracing stylus of pantograph on template and guides stylus around template.
• Inscribes pattern of lines and numerals on elements in wax coating with needle which is affixed to pantograph arm.
• Exposes glass to hydrofluoric acid fumes to etch pattern.
• Cleans glass with water and solvents.
• Fills etched characters with opaque paste to improve readability.
• Inspects etched work for uniformity, using calibrated microscope.