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" WHITTAKER's Side-Propellers. — We are disposed to attach very great consequence to the application of steam power, employed upon the Baltic, upon this Lake. At our request Capt. Whittaker has prepared the following memoranda of his invention and its operation. We solicit for it the attention of naval constructors and engineers. The Baltic left Buffalo, June 22d, 1854, — average speed to Cleveland (distance 180 miles,) 11 miles per hour; pressure of steam carried on starboard boiler, from 35 to 40 pounds ; on larboard boiler, from 45 to 55 pounds nmnber of revolutions per minute on larboard engine, from 60 to 72 ; number of revolutions on starboard engine, from 44 to 55; average steam carried on the two boilers, less than 45 pounds. "The Baltic should have a boiler sufficient to carry 80 pounds of steam when running. Notwithstanding the low steam she carried, she ran at a higher rate of speed than other propellers carrying 75 pounds of steam. The Baltic's engines work steam and water, when they should work dry steam, which is a loss of power. The cause is supposed to be small steam pipes. The unequal pressure of steam on tbe two boilers, shows clearly a loss of power, as they do not produce the same number of revolutions and travel of wheel. We are aware that the boilers and engines should be so connected, with feed and steam pipes, that they should work equal pressure, and the same number of revolutions per minute ; and we should so arrange all passage boats, and also freight vessels. Notwithstanding all of the above losses, the application of the propellers upon two sides of the Baltic, work nearly one-third more power, with the same amount of steam, than the stem wheel propeller. As an evidence of the improvement and increase of power over the paddle wheel; we will compare the Baltic's running with the steamboat Michigan's, a boat of much less tonnage and a less draught of water. She has a condensing beam engine of 10 feet stroke, and 44 inch cylinder, new boilers, capable of carrying 30 pounds of stream with safety, and we have no doubt they did carry near that amount, when running with the Baltic on the 22d inst The Michigan was beaten about one mile an hour by the Baltic. Dimensions of the Baltic's engines, 36 inch stroke and 26 inch cylinder. We are of the opinion that the Baltic's boilers are capable of keeping up 60 pounds of steam, when running. Her speed is quite sufficient for a business boat, when carrying 45 pounds of steam. Her engines, propellers, brackets, and guards, have been well tested, light and loaded, in gales of wind and heavy seas. On her last trip from Chicago, she encountered a heavy gale of wind, and a heavy sea, with a cargo of 30,000 bushels of oats, and 165 head of fat cattle. Her engines, propellers, brackets, and guards, stood firmly ; notwithstanding she was changed from a paddle-wheel boat, with very different guards to those which we would place upon new boats. Another great advantage we find in the side propeller over the paddle-wheel boat and the stem-wheel propellers — the propeller in the stem causes the vessel to rell