After exhibiting the Engines to the arbitrators and the Various modes of using them I put the following questions to the four arbitrators, _First_ Will the explosion of a submarine Bomb of one or two hundred pounds of powder under the bottom of a Ship of the line destroy her? Answer, we believe it would the blowing up of the Brig Dorothea in walmer roads being indubitable proof— _Second_ Were an instantanious bomb anchored under water and a Vessel to run against it so that the bomb should strike any place under her bottom and explosion there take place would it destroy her? Answer, we believe it would. The power of the engines being thus acknowledged the following opinions were started by Capt. Hamilton as difficulties in the way of using them. _First_ Where can men be found who will have courage to use such engines, who knowing that were they caught they would be liable to suffer death for using engines not admitted by the laws of war hence what advantages could the enemy draw from Such engines? _My Answer_ Englishmen have had courage to run four times among the Enemy in Boulogne roadstead with such engines and have courage to do so again. Then is it suffecient security for England to rely on that frenchman have not courage to take advantage of dark nights to anchor submarine bombs in the waters near Boulogne where the blockading squaderns usually cruise or near the Black rocks or ushant where the brest Blockading squadern usually cruise or off cape Grinez or half channel over In the waters where British fleets now cruise without a feeling of danger, Should the French Emperor adopt such a system and Issue a proclamation that he would retaliate man for man who would hang a Frenchman? This is for Ministers to consider; _Second objection of Capt H_. Were ten thousand of such bombs anchored the first storm would drive them on shore and destroy them. _Answer_ The Buoys to mark shoal water are held in the Same spot in all weathers yet Buoys are of a large Volume and exposed to the shock of the surface of the water which is much more violent than the action ten or fifteen feet deep, therefore if Buoys be held by sufficient anchor and cable, a bomb of not one fortieth of the Buoys Volume may be held also, but to decide on this doubt let a bomb without a lock be anchored in Dover Roads and if it be not found there next Spring I will give up this point. _Third objection of Capt. H._ A few vessels with cables stretched could sweep the channel and destroy the Bombs. _Answer_,