HELIOTYPY
Source: 567
He″li‐o‐ty′py (?), n. A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.
Source: 567
He″li‐o‐ty′py (?), n. A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.