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Help identify this map-printing technology.
Most old maps on my home (including few school-atlas and few professional-quality big maps from National Atlas of India), used a peculiar technology; where; instead the color-'dots'; used 'strokes' of continuous straight-lines oriented in different directions.
This one is portion of map of South America from a school-atlas published by a local publisher here (Kolkata) (Chandi Charan Das and co., 150 Lenin sarani, kol-13. No mention of date or edition found however it is 15 to 20 yrs old book)
The word Caracas ( "কারাকাস" ) on paper is approx 1.05 cm wide
On a Compound microscope (biology) (objective: 10X, Eyepiece 10X) but using reflected light; the lines does not show any 'dots' but uniform, continuous bands . The below-photograph is taken from another map (on Asia, topography) from the same book.
Left one shows some vertical and horizontal lines. Right-side-one shows some diagonal lines.
However the same school-atlas book used dot-printings too; in some-other maps; which are solely made with dot-method. no such 'solid' lines I yet found on these set of maps.
An old map by National Atlas of India, copyrighted as 1986; used similar pattern and probably same technology. But their grids are more fine (narrow and closely-placed).
The width of the word "Chamoli" on paper is approx 3.3 cm
Could anyone tell the identity of this beautiful old map-printing technology?
Suggested tags: Printing-techniques, Identification. Maps