The submarine chaser is a light-draught, high-powered, skimming-dish type of husky motorboat, mounting rapid-fire, 3 or 4-inch guns. In order to prove effective against the submarine it is necessary to have many of these boats, and it is a matter of particular interest that the marvelous resources of the United States at the time of her entrance into the war enabled her to immediately begin a campaign for the construction of chasers, which would be able to guard the seas in the channels of traffic and along the ports into which the submarine might attempt to sneak. NO EXPERT NAVAL KNOWLEDGE REQUIRED. The operation of the chaser does not require the degree of technical skill and knowledge of naval strategy required in the handling of ships of the naval type. A fleet of chasers is manned largely by naval reserves, who have a certain amount of training, but who are neither navigators nor experts in naval affairs. The operations are, however, directed by the naval authorities. The submarine chaser is effective because it draws very little water, has high speed, can be quickly turned and diverted from its course and does not present any great depth of hull at which the submarine can fire a torpedo. It would be possible for a torpedo to pass under a chaser without hitting it--if the submarine cared to waste such an expensive weapon on so small an adversary. When the submarine attempts to come to the surface and use the rapid-fire gun with which she is armed she is at a disadvantage, because it takes her several minutes to emerge. Additional time is required to swing the gun up through its automatic hatch while the men scramble to the deck to man it. The chaser, with a speed of approximately 35 to 40 miles an hour, will travel somewhere between a mile and a half to two miles in this period. Its gun has been ready from the start, and the chaser has had half a dozen shots or so with only a single hit needed to put the submarine out of commission. Even if the submarine is at the surface and has her gun mounted ready for action, she is at a disadvantage with the chaser. The chaser, taking advantage of her speed and small size, goes skimming across the water at the rate of 40 miles an hour, and it takes a mighty fine gunner to be able to hit a small craft, going in a zigzag course over the water at such speed. The chaser may continue to circle the submarine awaiting her opportunity which will of necessity come when the U-boat attempts to submerge. The submarine must go through the regular form of running back her gun, and battening down the water-tight hatches, before she can submerge, and the latter process again takes several minutes. Therefore while the submarine is preparing to dip, the chaser can run upon her and let loose the fire from its rapid-fire gun. A POOR SURFACE FIGHTER.