1To Benjamin Franklin from Robert Erskine, 16 August 1776 (Franklin Papers)
ALS : American Philosophical Society; AL (draft ), Ringwood Manor Museum, Ringwood State Park, Ringwood, N.J. I beg leave to enclose you a drawing of a new Contrivance for stopping Channels and Rivers, which I call Marine Chevaux de Frise; a model of which was exhibited at Headquarters in New York, the 20th of last month. After the ships passed the Batteries with such facility, I considered...
2From Benjamin Franklin to Robert Erskine, 16 October 1776 (Franklin Papers)
ALS (draft): American Philosophical Society I should sooner have acknowledged your Favour of Aug. 16. containing the Drawing of your Chevaux de Frise: but that I have been so extreamly occupy’d as to be oblig’d to postpone writing to many of my Correspondents. Please to accept my Thanks for the Communication of your Contrivance, which I am persuaded will answer the Purpose where ever the Bottom...