Claims

Andrew Ellicott prepared L'Enfant's plan of Washington, D.C. for engraving; Thackara and Vallance engraved it (1792)

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Directed by Jefferson, Andrew Ellicott reproduced Pierre L'Enfant's manuscript plan for engraving; Philadelphia engravers Thackara and Vallance (and Samuel Hill in Boston) engraved it in 1792, and it was published without attribution to L'Enfant. The source said Ellicott engraved it himself.

Evidence

RelationRecordNote
documentsblogs.loc.govLibrary of Congress Maps blog: Jefferson directed Ellicott to reproduce the manuscript plan for engraving; Ellicott found engravers Thackara and Vallance (Philadelphia) and Samuel Hill (Boston); published without attribution to L'Enfant (1792)
corroboratesraremaps.com1792 first printed plan, based on Andrew Ellicott's manuscript; engraved by James Thackara and John Vallance

Sources

SourceRelationAt
DC Masonic symbolism (Camp Gagnon)asserts

Claim

Directed by Jefferson, Andrew Ellicott reproduced Pierre L'Enfant's manuscript plan for engraving; Philadelphia engravers Thackara and Vallance (and Samuel Hill in Boston) engraved it in 1792, and it was published without attribution to L'Enfant. The source said Ellicott engraved it himself.

Correction: the source said Ellicott "revised and engraved" the plan. He prepared it; others engraved it.