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Updated: May 23, 2025
During the war aviators had to train for some time before becoming even approximately accurate. Tom Swift decided that to leave this matter to chance or to the eye of the occupant of an airship was too indefinite. Accordingly he invented a machine, something like a range-finder for big guns. With this it was a comparatively easy matter to drop a grenade at almost any designated place.
These volunteers included clerks, business men, professional men from the cities of New Jersey and Pennsylvania, thousands of workmen from great factories like the Roebling wire works, thousands of villagers and farmers, all blazing with zeal, but none of them able to handle a high-power Springfield rifle or operate a range-finder or make the adjustments for the time-fuse of a shell.
They know the wind speed, they know their height, and they can figure out by this new arrangement they have exactly when the time is to let go their bombs. Senator Kirby: Something in the nature of a range-finder? Adjt. Prince: A sort of range-finder. Adjt.
The N.C.O. took up the range-finder and measured the distances first to the house, then to the copse.
There is not enough waste motion among the lot to tip over the range-finder, or the telescopes, or the score board, or any of the other paraphernalia assisting the man who is looking through the sight in knowing where to aim next, as a screw answers softly to his touch. Is the sport of war dead? Not for Archibald!
One of its values is that its projectiles throw up sufficient dust to enable the gunner to tell exactly where they strike, and within a few seconds he is able to alter the range accordingly. In this way it is its own range-finder.
If a costly shot was fired over the enemy the next one was fired lower, and possibly between the two the range might be got, both vessels meantime changing positions and range. To change this, to either injure an antagonist quickly or get away, the "range-finder" was invented, as a matter not of business profit, by Lieutenant Bradley A. Fiske, of the U. S. Navy, in 1889.
"I have first to determine where I want to drop the bomb," Tom explained, "and then I have to get my distance from it on the range-finder. Next I have to know how fast I am traveling, and how far up in the air I am, to tell what the velocity of the falling bomb will attain at a certain time.
The loss which our advance sustained at this point was greatly increased by the sending up of an observation balloon, which hung over the road, just above the trees, and not only attracted the fire of the Spaniards in front, but served their artillerymen as a target and a range-finder.
And first it may be stated that the range-finder is largely a measure of mere economy. A two-million-dollar cruiser is not sailed, or lost, as a mere pastime. Whoever aims best will win the fight. Ten years ago the way of finding distance, or range, which is the same thing, was experimental.
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