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range finder - traduzione in olandese
DEVICE FOR DETERMINING THE DISTANCE TO AN OBJECT; DEVICE THAT MEASURES DISTANCE FROM THE OBSERVER TO A TARGET, IN A PROCESS CALLED RANGING
Rangefinding telemeter; Range finder; Range-finder; Rangefinders; Range-finding; Range scanner; Rangefinding; Rangefinding micrometer; Telemeter (rangefinder)
![German cruiser ''Admiral Graf Spee'']] on display in [[Montevideo]].](https://commons.wikimedia.org/wiki/Special:FilePath/Graf Spee telémetro 01.jpg?width=200 "German cruiser ''Admiral Graf Spee'']] on display in [[Montevideo]].")
![ORP ''Wicher'']]](https://commons.wikimedia.org/wiki/Special:FilePath/Polish destroyer's range-finder.JPG?width=200 "ORP ''Wicher'']]")
range finder
n. afstandsmeter
range-finding
(schot in de roos, raken van het doel) afstelling van vuur
rifle range
.jpg?width=200 "Electronic targets in use at the British Airgun Championship.")
![NSRA's]] Malcolm Cooper 50 Metre Range on [[Bisley Camp]], UK](https://commons.wikimedia.org/wiki/Special:FilePath/Malcolm Cooper 50Metre Range, Lord Roberts Centre.jpg?width=200 "NSRA's]] Malcolm Cooper 50 Metre Range on [[Bisley Camp]], UK")
SPECIALIZED FACILITY DESIGNED FOR FIREARMS PRACTICE
Gun ranges; Rifle range; Gun range; Rifle Range; Range master; Firing range; Firing ranges; Shooting ranges; Miniature rifle range; Target range shooting; Shooting-ranges; Shooting ground; Barrack range; Shooting Range; Backstop (shooting)
draagwijdte; reikwijdte; (geweer)schotsafstand
Definizione
Range Finder
An apparatus for use on shipboard to determine the distance of another
ship or object. It is designed for ships of war, to give the range of
fire, so as to set the guns at the proper elevation. The general
principle involved is the use of the length of the ship if possible, if
not of its width, as a base line. Two telescopes are trained upon the
object and kept trained continuously thereon. The following describes
the Fiske range finder.
The range finder comprises two fairly powerful telescopes, each mounted
on a standard, which can be rotated round a vertical axis, corresponding
with the center of the large disc shown in the engraving. One-half of
the edge of this disc is graduated to 900 on either side of a zero
point, and below the graduation is fixed a length of platinum silver
wire. This wire only extends to a distance of 81.10 on either side of
zero, and is intended to form two arms of a Wheatstone bridge. The
sliding contact is carried by the same arm as the telescope standards,
so that it moves with the telescope. The two instruments are mounted at
a known distance apart on the ship, as shown diagrammatically in the
cut. Here A and B are the centers of the two discs, C and D the arms
carrying the telescopes, and E and F the platinum silver wires. Suppose
the object is at T, such that A B T is a right angle, then
AT=AB/sin(ATB).
If the two sectors are coupled up as shown, with a battery, h, and a
galvanometer, by the wires, a b and c d, then since the arm, e, on being
aligned on the object takes the position c1 while d remains at zero, the
Wheatstone bridge formed by these segments and their connections will be
out of balance, and a current will flow through the galvanometer, which
may be so graduated as to give the range by direct reading, since the
current through it will increase with the angle A T B.
Fig. 281. RANGE FINDER.
In general, however, the angle A B T will not be a right angle, but some
other angle. In this case AT = AB / sin(A T B) * sin( A B T), and hence
it will only be necessary to multiply the range reading on the
galvanometer by the sine of the angle A B T, which can be read directly
by the observer at B. This multiplication is not difficult, but by
suitably arranging his electrical appliances Lieutenant Fiske has
succeeded in getting rid of it, so that the reading of the galvanometer
always gives the range by direct reading, no matter what the angle at B
may be. To explain this, consider the two telescopes shown in the cut in
the positions C and D; the whole current then has a certain resistance.
Next suppose them, still remaining parallel, in the positions C1 and D1.
The total resistance of the circuit is now less than before, and hence
if C1, one of the telescopes, is moved out of parallel to the other,
through a certain angle, the current through the galvanometer will be
greater than if it were moved through an equal angle out of a parallel
when the telescopes were in the positions C and D. The range indicated
is, therefore, decreased, and by properly proportioning the various
parts it is found that the range can always be read direct from the
galvanometer, or in other words the multiplication of A B/sin( A T B )
by sin( A B T ) is to all intents and purposes performed automatically.
There is, it is true, a slight theoretical error; but by using a small
storage battery and making the contents carefully it is said to be
inappreciable. Each telescope is fitted with a telephone receiver and
transmitter, so that both observers can without difficulty decide on
what point to align their telescopes. It will be seen that it is
necessary that the lines of sight of two telescopes should be parallel
when the galvanometer indicates no current. It has been proposed to
accomplish this by sighting both telescopes on a star near the horizon,
which being practically an infinite distance away insures the
parallelism of the lines of sight.
Fig. 281. RANGE FINDER.
In general, however, the angle A B T will not be a right angle, but some
other angle. In this case AT = AB / sin(A T B) * sin( A B T), and hence
it will only be necessary to multiply the range reading on the
galvanometer by the sine of the angle A B T, which can be read directly
by the observer at B. This multiplication is not difficult, but by
suitably arranging his electrical appliances Lieutenant Fiske has
succeeded in getting rid of it, so that the reading of the galvanometer
always gives the range by direct reading, no matter what the angle at B
may be. To explain this, consider the two telescopes shown in the cut in
the positions C and D; the whole current then has a certain resistance.
Next suppose them, still remaining parallel, in the positions C1 and D1.
The total resistance of the circuit is now less than before, and hence
if C1, one of the telescopes, is moved out of parallel to the other,
through a certain angle, the current through the galvanometer will be
greater than if it were moved through an equal angle out of a parallel
when the telescopes were in the positions C and D. The range indicated
is, therefore, decreased, and by properly proportioning the various
parts it is found that the range can always be read direct from the
galvanometer, or in other words the multiplication of A B/sin( A T B )
by sin( A B T ) is to all intents and purposes performed automatically.
There is, it is true, a slight theoretical error; but by using a small
storage battery and making the contents carefully it is said to be
inappreciable. Each telescope is fitted with a telephone receiver and
transmitter, so that both observers can without difficulty decide on
what point to align their telescopes. It will be seen that it is
necessary that the lines of sight of two telescopes should be parallel
when the galvanometer indicates no current. It has been proposed to
accomplish this by sighting both telescopes on a star near the horizon,
which being practically an infinite distance away insures the
parallelism of the lines of sight.
Wikipedia
Rangefinder
A rangefinder (also rangefinding telemeter, depending on the context) is a device used to measure distances to remote objects. Originally optical devices used in surveying, they soon found applications in other fields, such as photography and in the military. They were specially useful for finding the range of a target, such as in naval gunnery and anti-aircraft artillery. The word telemeter is derived from Ancient Greek τῆλε (têle) 'distant, far away', and μέτρον (métron) 'something used to measure'.
Esempi dal corpus di testo per range finder
1. Among items written in the notebook was a laser range–finder.
2. Among the items written in the notebook was a laser range–finder.
3. The spacecraft will use a laser range finder to home in on the reflector during the final approach.
4. This might explain why the US Department of Justice has just given the researchers $250,000 (142,000) to develop an eye–safe laser range finder.
5. Back in today‘s episode of One Man And His Hangover, I feel almost human again, and am tentatively contemplating a lunchtime range–finder.