Course of Lectures Upon the Defence of the Sea Coast of the Us Delivered Before
Course of Lectures Upon the Defence of the Sea Coast of the Us Delivered Before
Henry L Henry Larcom Abbot
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Indeed, on very high sites, like the bluffs bordering the Golden Gate, these figures give an exaggerated idea of the defects of the system. 62 Economy in Coast Defence. The value of B for this kind of mounting (20 000 divided by 39 200) is 0. 51. Case of the King Mounting for the 5O-ton 12-inch Rifle. The gun in its firing position ex- poses a target of about 80 square feet ; and in its load- ing position, perpendicular to the parapet, a target of about 40 square feet computed on the same prin-... ciples as above. Major King estimates that the gun can be fired with steam-power deliberately once in six mmutes ; but by improved machinery it could doubtless be fired once in five minutes. Assume it to be exposed in the firing position one minute, and in the loading position perpendicular to the parapet four minutes, and ~ba t becomes 8040X4: And from equation (2) we have : M= 125_-48 =160 Hence $70 000 Xl. 60=$112 000 is the largest sum which can be paid judiciously for this mode of mount- ing.
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