• 18, Industrial Estate, Ambala cantt
  • Mon - Sat : (9am - 6 pm)
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STUARET's METER MARINE DISTANCE

STUARET’s METER MARINE DISTANCE

SKU PATT NO. 6605-000161 Categories ,

Description:

  • The instrument consists of a long curved lens (8), attached to a radial distance scale, which is graduated from one-quarter of a cable to 30 cables.
  • Both this lens and the scale are mounted in a slide, which can be moved up and down inside the frame of the instrument.
  • A pinion carried on the spindle of a milled knob (10) engages a rack to provide this movement.
  • A fixed wedge-shaped lens (9) is mounted, alongside the moving lens, on the frame of the instrument.
  • A small telescope is fitted with an interrupted thread can be inserted in the metal collar (4).
  • The telescope should be focused after being fitted in the instrument. The object, when viewed, appears as a super- imposed image.
  • Across the movable distance scale is affixed horizontal bar. This is the height scale; it is graduated from 0 to 220 feet. On this bar is a sliding pointer.
  • On the reverse side of the instrument is a blank table for inserting, in pencil, the required data concerning ships likely to be observed.
ENQUIRY!

Meter Marine Distance is an instrument for measuring the ranges of an object of known height at ranges between one quarter of a cable to 30 cables.

OPERATION:

To obtain a range, set the height above the waterline of the target against the left edge of the sliding pointer. By turning the milled knob, bring the top of one image in line with the portion of the waterline which is immediately beneath the target in the other image. The distance in cables is then read against the index mark on the sliding pointer.

ALTERNATIVE USE:

The instrument can also be used to measure the range of an object of negligible or unknown height. To do this, set own height of eye on the instrument and, by rotating the milled knob, bring the waterline of the object in one image up to the horizon in the other image. The error involved in this method is about 3 percent of the range measured, but the method is of same values at ranges below the limit of the Way mouth-Ross instrument.

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