
The SciencesJanuary 5, 1889
The Positive Cyanotype Process
Or Method of Reproducing With Dark Lines on a Clear Ground Fac-Simile Copies of Drawings, Plans, and Tracings

The Positive Cyanotype Process
Or Method of Reproducing With Dark Lines on a Clear Ground Fac-Simile Copies of Drawings, Plans, and Tracings