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Updated: May 23, 2025
But New-Yorkers, if not less inquisitive, are more energetic than their Quaker cousins, and prefer the direct method of leaning out of the window, or, if need be, going down into the street itself. Still, there is something to be said for the "quizzing-glass," for we may look upon it as the range-finder of the domestic fortress, forewarning us of the approach of the bore and the process-server.
"Here is the range-finder and the speed calculator," the young inventor went on as he indicated the various instruments. "The operator sits here, where he can tell when is the most favorable moment for releasing the bomb." Tom took his place before a complicated set of instruments, and began manipulating them.
A few moments later the youthful commander appeared again on the platform deck, carrying a range-finder on a tripod. Through the telescope he took some rapid sights, then did some quick figuring. When he looked up Benson saw Jacob Farnum standing within four feet of him. The shipbuilder's face looked gray and haggard. "How much?" asked Jacob Farnum.
But Jack, instead of resting, promptly placed the range-finder. As he tried to adjust the telescope the submarine boy's hands shook. Jack glanced over at Lieutenant Danvers, cool and impassive. Danvers knew all about working that range-finder. But the naval officer was aboard as an official spectator. If the lieutenant aided in any way, then the Pollard submarine would be disqualified.
To assist the range-finder in his task of sighting it is necessary that he should be provided with firing tables set out in a convenient form, which, in conjunction with the telemeter, serve to facilitate training for each successive round.
He wore a pair of glasses in a case slung over one shoulder and black leather gauntlet-gloves. The Officer of the Forenoon Watch, known among his messmates as Tweedledee, was focusing the range-finder on the ship ahead of them in the line; he looked round as the new-comer appeared, and greeted him with a grin. "Hullo, James," he said. "Your afternoon watch? Well, here you are."
It has its reason in the familiar mathematical proposition that if two angles and one side of a triangle are known, the other sides of the triangle are easily found. That is, that it can be determined how far it is to a distant object without going to it. But Fiske's range-finder makes no mathematical calculations, nor requires them to be made, and is automatic.
The mercurial barometer reading by verniers to three places of decimals was set up and read, and the two aneroids were adjusted to read with it. These two aneroids perhaps deserve a word. Aneroid A was a three-inch, three-circle instrument, the invention of Colonel Watkins, of the British army, of range-finder fame.
He fought them to maintain the dive, straight for the house and its invisible bubble of force. The flutter became worse as their speed increased, and vibration racked the whole ship. He judged the distance by the range-finder on the Baring. At the last moment he pulled out and up. The ship skidded down sickeningly, and then caught. Thane fought bitterly to keep conscious.
If the correct sight-bar range were given to the gun, and if the gun were correctly laid and the pointer pressed the button at precisely the right instant, the shot would hit the target, practically speaking. But, in actual practice, the range-finder makes an error, the spotter makes an error, the plotting-room makes an error, the sight-setter makes an error, and the gun-pointer makes an error.
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