But Allingham remained a reservist, and during World War II he was called on to find a solution to the German magnetic mines that were bottling up the English harbor of Harwich, on the Essex coast.

• 但Allingham是一名预备役军人，在二战期间他被征召以对付德国的磁性水雷，这些水雷布置于英国艾塞克斯海岸的Harwich港口。