Dividing engine
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A dividing engine is a device employed to mark graduations on measuring instruments.
Dividing engine at the Michigan Museum of Surveying
Dividing engine at the Museo Galileo in Florence.
Circular Dividing Engine
Diffraction grating
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In optics, a diffraction grating is a grating with a periodic structure of appropriate scale so as to diffract light, or another type of electromagnetic radiation, into several beams traveling in diff
Dividing engine
…development of precision machining in the Industrial Revolution. Henry Joseph Grayson - an Australian inventor who developed an engine (~1900) for making diffraction gratings that ruled 120,000 lines to the inch (approximately 4,700 per mm). Palmer, Christopher (2020). Diffraction Grating Handbook (8th ed.). MKS Newport…
A very large reflecting diffraction grating
An incandescent light bulb viewed through a diffractive effects filter.
A blazed diffraction grating reflecting only the green portion of the spectrum from a room's fluorescent lighting
A helical fluorescent lamp photographed in a blazed reflection-diffraction grating, showing the various spectral lines produced by the lamp.