title: Ruled gratings and wavelength tables.
abstract: The development of grating ruling is presented in capsule form, from the first experiment of Rittenhouse in 1876 to the ruling of large echelles under interferometric control. The evolution of wavelength tables, especially in the United States, is described.
authors.forename: G R
authors.initials: GR
authors.lastname: Harrison
authors.forename: E G
authors.initials: EG
authors.lastname: Loewen