Definition

Noun: 1. A network of fine lines, dots, or crosshairs: A precise grid or pattern of lines, often etched or projected onto a transparent surface, used for measurement, alignment, or targeting within the field of view of an optical instrument like a microscope, telescope, or theodolite. 2. A reticle: Specifically, the pattern of lines or markings in the eyepiece of an optical device, used as a reference scale or to aid in aiming.

Usage Examples

• Noun:
  • The microscope's graticule allowed the scientist to measure the exact size of the cell.
  • To align the telescope, center the star on the crosshairs of the graticule.
  • The surveyor used the graticule in the theodolite's eyepiece to take precise angular measurements.

Advanced Usage

• "Calibrate the graticule": To adjust or verify the scale of the graticule using a known standard, ensuring accurate measurements.
  • Before taking measurements, it is essential to calibrate the graticule using a stage micrometer.
• "Graticule lines": Refers specifically to the individual lines that form the grid or pattern.
  • The specimen's length was determined by counting the number of graticule lines it spanned.

Variants and Related Words

• Reticle (n): A more common synonym for a graticule, especially in the context of telescopic sights (scopes) for firearms or surveying instruments.
• Eyepiece scale (n): A descriptive term for a graticule used for measurement.
• Crosshair (n): A specific type of graticule consisting of two perpendicular lines intersecting at the center, used for aiming.

Synonyms

• Reticle: A network of fine lines or fibers in the eyepiece of an optical instrument.
• Grid: A framework of spaced parallel bars; a more general term.
• Micrometer scale: A type of graticule specifically designed for precise measurement of small distances.

Related Phrases

• Focal plane: The plane where the graticule is located within the optical instrument.
  • The graticule is fixed in the focal plane of the eyepiece.
• Stage micrometer: A calibrated slide used to calibrate a microscope's graticule.
  • A stage micrometer is required to determine the value of each division on the eyepiece graticule.

Noun

1. a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument