In addition there are a few foreign accounts which give dimensions and descriptions. The most complete was probably that of Jean Baptiste Marestier, a French naval constructor who visited the United States soon after the end of the War of 1812 and published a report on American steamboats in 1824.[11] The _Steam Battery_ is barely mentioned though a drawing of one of her boilers is given. Marestier made another report on the American Navy, however. Extensive searches have been made for this in Paris over the last 14 years, but this paper has not been found in any of the French archives. References to the original text indicate that the naval report dealt very extensively with the _Steam Battery_. Some of his comments on the battery appeared in _Proces-verbaux des Seances de l'Academie des Sciences_.[12] Marestier considered the powers of the battery to have been overrated due to fanciful accounts of some laymen writers. He was aware of the shortcomings of the double hull in a steam vessel at the then-possible speeds, but he apparently thought two engines, one in each hull and each with its boilers would be better than Fulton's arrangement of boilers in one hull and engine in the other. He noted that the paddle wheel turned 16-18 rpm and that steam pressure sustained a column of mercury 25 to 35 centimeters. The safety valve was set at 50 centimeters. Fuel consumption was 3-5/8 cords of pine wood per hour. In view of the access Marestier is known to have had to American naval constructors, shipbuilders, and engineers, it is highly probable that he not only obtained the building plan of the ship but also some of the earlier project plans from the builders and from Fulton's superintendent, Stoudinger. It is, therefore, a great misfortune that his lengthy report on the _Battery_ cannot be produced. A French naval officer who investigated the ship, M. Montgery, also wrote a description, published in "Notice sur la Vie et les Travaux de Robert Fulton."[13] [Illustration: Figure 5.--FLOATING BATTERY _Spanker_ built, in England by William Barnard, at Deptford on the Thames, and launched June 14, 1794. Rigged as a bomb ketch, its length is 111 feet 7 inches in the keel, extreme beam 42 feet 4 inches, depth of hold 8 feet. Upper deck plan also shown.] It should be noted in regard to what Montgery wrote about the _Battery_, that in 1821 it had been considered desirable to disarm the ship. The engineer in charge, William Purcell, had reported that as there were not proper scuppers, dirt and water had entered the hull and had collected under the engine and boilers, causing damage to the hull, and also that with guns removed, the _Battery_ would float too high for the paddle wheel to propel the vessel; so it had been decided to remove all machinery as well as the armament.