|Title||Letter, 'Of the solar spots' from Humphry Marshall to Benjamin Franklin|
|Date||3 May 1773|
Published in Philosophical Transactions, as 'Extract of a letter from Mr. Humphry Marshall, of West Bradford, in Chester County, Pennsylvania, to Dr. Franklin, sent with sketches of the solar spots, dated May 3, 1773'
Read 8 February 1774
|Physical description||Ink on paper|
|Related material||DOI: 10.1098/rstl.1774.0026|
Fellows associated with this archive
|NA7974||Franklin; Benjamin (1706 - 1790)||1706 - 1790|