“A Genius has appear’d lately”
In his 29 Apr 1776 letter to Samuel Adams, the Rev. Dr. Samuel Cooper described the man who came forward with a solution for cannon with damaged trunnions:
It was judg’d by…all here, at first, that they could never again be made useful: But a Genius has appear’d lately, a County Surgeon in our Army, an obscure Man till now, who has hit upon a Method of mounting them, without Trunnions, so as to render them it is tho’t, serviceable as ever.To my surprise, I find that this is the first time in more than twenty years that Boston 1775 has mentioned Dr. Preserved Clap.
I can only give you some general imperfect Idea of this Method. He first sinks the Cannon to its Centre, in a strong wooden Sock, like the Barrell of a Musket in it’s Stock: He braces it with three iron Clasps to prevent it’s leaping out of this Stock; and yet so as not to obstruct any Movement necessary to it’s use.
The Cannon in this wooden Bed, is mounted on a Carriage, and by rounding the lower side of the latter like the Foot of a rocking Cradle, Provision is made for the Elivation & Depression of the Cannon.
He has compleated one or two already in this Manner; and if Experience proves it, to be, what some good Judges have already pronounc’d it, the Invention will do Honor to our Country & ought to be immortalise the Name of the Man, which is Clap.
It will give us an hundred fine Cannon for the Defence of our Harbor, which a few Days ago were given up as entirely useless.
Dr. Clap did make a short appearance in The Road to Concord, in which I posited that his method was how the New Englanders mounted damaged artillery pieces in 1775.
In Old Landmarks and Historic Fields of Middlesex (1895), Samuel A. Drake included this picture, saying it showed Dr. Clap’s carriage as drawn “by an officer of artillery present at the siege.” I haven’t located that original drawing or the officer’s name.
Cooper’s letter is the earliest mention of Dr. Clap and his invention that I’ve found, as well as the most detailed description of it. The wording suggests that Clap came forward with his method only in the spring of 1776, not during the siege. And Cooper’s description really doesn’t match the drawing. So I have questions.
TOMORROW: Who was Preserved Clap?











