"Having observed in your magazine of July, Page 312, a description given by a Mr Samuel Ley (to whose person and residence I am an entire stranger) of a diving-boat, invented some years since by Mr Nathaniel Symons of Harberton near Totnes in Devon, a house carpenter by trade; and Mr Ley asserting that Mr. Symons also invented the famous engine for taking up wrecks, though his cousin, "L . . . e" and some others, deprived him of both the honour and profit; and as I am the first inventor of a diving engine in England, without communication of air from above, I therefore presume Mr. Ley means me, under the title of Mr Symon's cousin, "L . . .e" (to which kindred I have not the least pretension.)
Now, whether the assertion proceeds from prejudice, or false information, I will not determine; but whatever may be the motive, I think it incumbent on me to give an answer thereto, which shall be genuine. And , first, as to the diving-boat insisted upon, I shall say nothing of it, having never seen it, nor ever h eard that it was anywise serviceable, but readily agree with Mr. Ley that his account of it is imperfect; and as to the famous diving-engine, which Mr. Ley is pleased to say was invented bv Mr Symons, I take the liberty to aver it is my own invention. It is observable that Mr. Ley is silent with respect to its description; but as it hath been of such singular service to the public, I shall here insert a particular description thereof, with the principal motive of the invention.
Necessity is the mother if invention, and being in the year 1715 quite reduced, and having a large family, my thoughts turned upon some extraordinary method to retrieve my misfortunes and was prepossessed that it might be practicable to contrive a machine to recover from wrecks lost in the sea; and the first step I took towards it was going into a hogshead, upon land, bunged up tight, where I stayed half-an-hour without communication of air; then I made a trench, near a well, at the bottom of my orchard in this place in order to convey a sufficient quantity of water to cover the hogshead, and then tried how long I could live under water without air-pipes of communication of air and found I could stay longer under water than upon land.
This experiment being tried, I then began to think of making my engine, which was soon made by a cooper in Stanhope Street, London, of which you have the following description:
It is made of wainscot, perfectly round, about six feet in length, about two foot and a half diameter at the head and about eighteen inches diameter at the foot, and contains about thirty gallons; it is hooped with iron hoops without and within to guard against pressure. There are two holes for the arms and a glass about four inches diameter, and an inch and a quarter think, to look through, which is fixed in the bottom part, so as to be in a direct line with the eyes, two air-holes upon the upper part, into one of which air is conveyed by a pair of bellows, both of which are stopped with plugs immediately before going down to the bottom. At the foot part, there's a hole to let out water. Sometime, there's a large rope fixed to the back or upper part, by which it is let down, and there's a little line called the signal line, by which the people above are directed what to do, and under which is fixed a piece of timber as a guard for the glass.
I go in with my feet foremost and when my arms are got through the holes, then the head is put on, which is fastened with screws, It requires 500 cwt to sink it, and take 15 pound weight from it, and it will buoy upon the surface of the water. I lie straight upon my breast all the time I am in the engine, which hath many times been more than six hours, being frequently refreshed upon the surface by a pair of bellows"