Tone reproducition in the "halftone" photo-engraving process

[1] BULL AJ, 1917, PHOTOGR J, V41, P8

[2] IVES, 1926, J O S A R S I MAR

[3] Photographic reproduction of tone [J]. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, 1921, 5 : 232 - 258

[4] JONES LA, 1921, J O S A R S I, V5, P3

[1] BULL AJ, 1917, PHOTOGR J, V41, P8

[2] IVES, 1926, J O S A R S I MAR

[3] Photographic reproduction of tone [J]. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, 1921, 5 : 232 - 258

[4] JONES LA, 1921, J O S A R S I, V5, P3