Webster's Online Dictionary
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Definition: HELIOTYPY

Part of Speech Definition
Noun 1. A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Heliotypy" was first used in popular English literature: sometime before 1914. (references)

Definition: HELIOTYPY

Part of SpeechDefinition
Noun1. A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "HELIOTYPY" was first used in popular English literature: sometime before 1914. (references)