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The coronal extensions, perceptible with the naked eye to a distance of more than 3° from the sun, appeared barely one-third of that length on the best negatives. Little more could be seen of them either in Barnard's exquisite miniature pictures, or in the photographs obtained by W. H. Pickering with a thirteen-inch refractor the largest instrument so far used in eclipse-photography.
The agent completed his message and turned to continue his interrupted conversation. He found himself gazing into the muzzle of a .44, big, it seemed, as a thirteen-inch gun. "Why what?" he stammered. "I'm actin' jes' now as Slim's deppity," said McKee. "Unbutton an' han' that money over."
The eight-inch guns of the Brooklyn rumbled an unceasing chorus as they belched forth their shells, and occasionally a deeper roar from the thirteen-inch monsters of the Oregon would give a mightier volume to the din. "It was after one of the latter shots that the forward turret of the Oregon echoed with a rousing cheer.
The mortar is the earliest of all forms of cannon, and was in use in Europe in 1435. Its name is derived from its resemblance to an ordinary druggist's mortar. The great thirteen-inch mortars used in the civil war weighed seventeen thousand pounds, and threw a shell thirteen inches in diameter. These shells were so heavy that it took two men to bring them up to the cannon's mouth.
Muggledorfer kindly consented to call time, and we started after the fugitive ourselves. Ten minutes later we met Hinckley downtown. He looked as if he had had a slight argument with a thirteen-inch shell. He was also mad. "What was that you asked me to stop?" he snorted, pinning himself together. "Was it a gorilla or a high explosive?
Build up from the ends of the box two steel barbettes with revolving turrets as heavy as your side-walls; place in each a pair of thirteen-inch rifles; flank these turrets with four others of eight-inch wall, each holding two eight-inch guns; these again with four smaller, containing four six-inch guns, and you have power of offense nearly equal to your protection.
Soon after his visit I had the honour of casting for him a thirteen-inch speculum, which he afterwards ground and polished by a method of his own.
This gave Michigan one of the three well-equipped observatories in the country at that time. The telescope, a thirteen-inch objective, was purchased in this country, but other items of equipment were obtained in Berlin under the advice of Professor Encke, the Director of the Royal Observatory, whose assistant, Dr. Brünnow, came to America as Michigan's first Professor of Astronomy.
The Spanish guns became quiet at once, and a rousing cheer went up from the fleet. "Hay," in his exuberance, wanted to send a five-inch shell from our gun at the burning fort, but the distance was too great and he was compelled to be content with a couple of well-aimed shots at the nearest battery. "I wish we had thirteen-inch guns and the range was about ten feet," grumbled "Stump."
At its muzzle velocity the thirteen-inch shell will penetrate 26.66 inches of steel, the twelve-inch, 24.16 inches; the ten-inch, 20 inches, and the five-inch, 9 inches. The one-pound shell bursts in piercing one-fourth and nine-sixteenths-inch plates, scattering its fragments behind the target.
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