“An account of the progress of our machine”
I collected this day in cash for the encouragt. of Mr. Bushnels Machine the sum of £13.4.4. in cash out of our regt.Boardman was a graduate of Yale, and David Bushnell (1740–1826) had just graduated from that college.
On 24 September, Dr. Benjamin Church wrote to his British army contact:
The distroying the Ships in the manner I wrote you before they began to dispair of tho’ the former of the Machine is full of faith that he can do it, Works on hardly and so let him, I say.This intel might have referred to the same machine, or to different technology designed to damage Royal Navy ships.
Bushnell’s invention was still in the works, but getting closer to completion, when the doctor and inventor Benjamin Gale (1715–1790) wrote from Killingworth to Silas Deane at the Continental Congress on 9 November:
In your last you requested I would give you an account of the progress of our machine, and whether anything may be expected of it. I now sit down to give you a succinct but imperfect account of its structure, which is so complicated that it is impossible to give a perfect idea of it. . . .But two weeks later, on 22 November, Gale had to report a delay:
I conclude by the time this reaches you the machine will be in camp. Lately he has conducted matters and his designs with the greatest secrecy, both for the personal safety of the navigator as to produce the greatest astonishment to those against whom it is designed,—
if this projection succeeds, of which I make no doubt, as I well know the man and have seen the machine while in embryo, and every addition made to it fills me with fresh astonishment and surprize. And you may call me a visionary, an enthusiast, or what you please,—I do insist upon it, that I believe the inspiration of the Almighty has given him understanding for this very purpose and design.
I have to ask pardon for the wrong information I gave you. At the time of my last writing, I supposed the Machine was gone, but since find one proving the navigation of it in Connecticut River. The forcing pump made by Mr. [Isaac] Doolittle, not being made according to order given, did not answer; which has delayed him. The trials I mentioned to have been made since Dr. [Benjamin] Franklin’s being here, was the explosion, which prov’d beyond expectation.The most famous American scientist of the day had stopped in Saybrook on his way back from Cambridge to Philadelphia in order to inspect this invention.
Gale sent another update and plea to Deane on 7 December:
…everything answers well, but still, he fails on one account. He proposes going in the night, on account of safety. He always depends on fox-wood, which gives light in the dark, to fix on the points of the needle of his compass, and in his barometer, by which he may know what course to steer and the depth he is under water, both which are absolute necessity for personal safety of the navigator; but he now finds that the frost wholly destroys that quality in that wood, of which he was before ignorant, and for that reason and that alone he is obliged to desist. He was detained near two months for want of money, and before he could obtain it the season was so far advanced he was, in the manner I have now related, frustrated. . . .As of 1 February, Gale was still seeking some phosphorescent material for Bushnell. He wrote, “I have lately seen the man, and conversed freely with him. He is no enthusiast; a perfect philosopher, and by no means doubtful of succeeding.” But the siege of Boston would end before warm weather.
The person, the inventor of this machine, now makes all his affairs a secret even to his best friends, and I have liberty to communicate this much from him only with a view to know if Dr. Franklin knows of any kind of phosphorus that will answer his purpose; otherwise the execution must be omitted until next spring, after the frosts are past.
TOMORROW: A new campaign.
(Several replicas of the Bushnell’s machine have been built over the years based on the verbal descriptions. The one shown above was in Westbrook, Connecticut, as of last year.)











