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Job Description:

  • 1) Measures, marks, and etches units on side of glass tube or similar measuring devices, using calibrating device and solution of hydrofluoric acid: Fills tube with specified quantity of mercury and marks meniscus of mercury with special pen.

  • 2) Covers tube with wax.

  • 3) Positions tube in calibrating device, aligns needle guide with calibrated ruler, and turns locknut to hold guide in place so that exact measurement can be marked, starting from meniscus.

  • 4) Turns handwheel that moves needle in back-and-forth motion to remove wax and expose glass to be etched with acid.

  • 5) Realigns needle guide to next unit to be marked and continues sequence until tube is calibrated.

  • 6) Removes tube from calibrating device and dips it into solution of hydrofluoric acid so that acid will permanently etch area of glass not covered with wax.

  • 7) Rinses tube in cold water to remove excess acid and in hot water to remove wax.




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End Of Job Description for: "GLASS CALIBRATOR"
DOT:   775.584-010

Job Number: 4511