Sir, Annapolis 10th Sept. 1776

The Bearer of this Mr. Hopkins tells me he took very particular notice of the late invented light Field pieces in use in the English Army 287and can furnish the necessary Directions for making and mounting them. He is also of Opinion that he can suggest a very considerable Improvemt. If these pieces are so light and handy and their Operation so great as he describes I think it will be well worth while to introduce them into our Army. Mr. Hopkins is a very ingenious Man and firmly attached to his Country. I am Sr. Your most obedt. Servant

Tho. Johnson Junr.

Nature of guns	Length of barrs. in the clear for	The thickness of the Barrs.	Diameter of the Shot
1/2 pounder	3.81	.305	1.526
1	4.785	.383	1.914
1 1/4	5.178	.414	2.071
1 1/2	5.502	.44	2.201
2	6.057	.485	2.423
2 1/2	6.52	.522	2.61
2 3/4	6.735	.539	2.694
3	6.922	.554	2.769
4	7.627	.61	3.051
6	8.737	.699	3.495
8	9.57	.766	3.828
9	10	.8	4.
10	10.354	.828	4.142
12	11.005	.88	4.402
16	12.114	.97	4.846
18	12.585	1.006	5.034
20	13.05	1.044	5.22
22	13.47	1.078	5.388
24	13.92	1.114	5.568
32	15.262	1.221	6.105
42	16.917	1.353	6.767

RC ; addressed: “To The Honble. Robert Treat Paine, Esqr. Member of Congress Philadelphia”; endorsed.