...lowance of fifty rounds to each gun. I think we may safely estimate that on the 1st of January, 1862, there were 1,500 sea coast guns of various calibres in position, from Evansport on the Potomac to Fort Brown on the Rio Grande. If we average their calibre at thirty-two pounders, and the charge at five pounds, it will at forty rounds per gun, give us 600,000 pounds of powder for these. The field-artill...