"By taking Murphy's car and driving it very carefully south on Broadway until the tape indicates precisely the distance marked on this one--the place where the turn was made. Then, driving down that street, the second distance shown on the tape will give you approximately the house you're looking for!" "Good Lord," exclaimed Whitney, "that's applying science to it! Sherlock Holmes wasn't so smart, after all!" Al and the manager agreed that there was too much traffic on Broadway in the daytime or early evening to attempt the experiment, but shortly after midnight, belated pedestrians might have wondered why a Green-and-White taxicab containing two men proceeded down Broadway at a snail's pace, while every now and then it stopped and one of the men got out to examine something inside. "I think this is the corner," whispered the garage manager to Whitney, when they reached Eighth Street, "but to be sure, we'll go back and try it over again, driving at a normal pace. It's lucky that this is a new instrument and therefore very accurate." The second trial produced the same result as the first--the place they sought lay a few blocks west of Broadway, on Eighth. Before they tried to find out the precise location of the house, Whitney phoned to headquarters and requested loan of a score of men to assist him in the contemplated raid. "Tell 'em to have their guns handy," he ordered, "because we may have to surround the block and search every house." But the taxi tape rendered that unnecessary. It indicated any one of three adjoining houses on the north side of the street, because, as the manager pointed out, the machine had not turned round again until it struck a north-and-south thoroughfare, hence the houses must be on the north side. By this time the reserves were on hand and, upon instructions from Whitney, spread out in a fan-shaped formation, completely surrounding the houses, front and rear. At a blast from a police whistle they mounted the steps and, not waiting for the doors to be opened, went through them shoulders first. It was Whitney, who had elected to assist in the search of the center house, who captured his prey in a third-floor bedroom. Before the Germans knew what was happening Al was in the room, his flashlight playing over the floor and table in a hasty search for incriminating evidence. It didn't take long to find it, either. In one corner, only partly concealed by a newspaper whose flaring headlines referred to the explosion of the night before, was a collection of bombs which, according to later expert testimony was sufficient to blow a good-sized hole in the city of New York.