A letter by Robert Spence Watson about a lecture on Joseph Swan’s lightbulb | Tyne & Wear Archives & Museums Blog

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A letter by Robert Spence Watson about a lecture on Joseph Swan’s lightbulb

By Susie Batey | Published May 30, 2014 | Full size is 799 × 625 pixels

A letter by Robert Spence Watson about a lecture on Joseph Swan’s lightbulb

A letter by Robert Spence Watson about a lecture on Joseph Swan’s lightbulb

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