Vintage Pelorus Marine/Nautical Nice Wood Case Sighting Vanes Maker Unknown

Description

Vintage Pelorus in Nice Wood Case Sighting Vanes
Marine / Nautical Navigational Device
Unknown Maker
Item Description
Here is a great marine/nautical Navigational Device for your buying consideration.  Would make a great gift for a special occasion or keep for yourself.
We are not sure of the maker of this Pelorus.  Not noted on the case or instrument that we can determine.  The Pelorus is most likely of WWII vintage.
The navigational instrument is made of metal.   The wire is in place on the one sighting vane as it should be.  Nice brass finish on the instrument.  Some loss and minor corrosion.  The numbering and marks are incised onto the face of the instrument.  There is a weight made out of concrete or some other stone material.
Beautiful dark colored wood case that this Pelarus comes in. The insides to hold the Pelorus securely in place all seem to be there.  The case has a piece of wood on the bottom of one side that d0es not allow it to lay flat.  The corners of the case are doweled together.  The lid has four brass pins in the corners.  Not sure how the brass corner piece works with the rest of the unit inside.
Some heat loss crazing of the case finish mostly to the top of the case. No splitting of the wood case on the top, bottom, or sides.  The bottom of the wood case is made of 3 pieces of wood and there is some opening at the seams.  The mirror is still in place on the one sighting piece.
The Pelorus ring is 5-9/16" by the outside of the ring.  The Pelorus Case is 3-15/16" tall (4-7/16" on raised side) with the wood lid in place, by 6.75" across, by 6.75" wide.  The unit is 7/5" tall with the sighting vane in the upright position.
Some information about what a Pelorus is and does, from the internet;
"In marine navigation, a pelorus is a reference tool for maintaining bearing of a vessel at sea. It is a "dumb compass" without a directive element, suitably mounted and provided with vanes to permit observation of relative bearings.
Modern use
In appearance and use, a pelorus resembles a compass or compass repeater, with sighting vanes or a sighting telescope attached, but it has no directive properties. That is, it remains at any relative direction to which it is set. It is generally used by setting 000° at the lubber's line. Relative bearings are then observed. They can be converted to bearings true, magnetic, grid, etc., by adding the appropriate heading. The direct use of relative bearings is sometimes of value. A pelorus is useful, for instance, in determining the moment at which an aid to navigation is broad on the beam. It is also useful in measuring pairs of relative bearings which can be used to determine distance off and distance abeam of a navigational aid.
If the true heading is set at the lubber's line, true bearings are observed directly. Similarly, compass bearings can be observed if the compass heading is set at the lubber's line, etc. However, the vessel must be on the heading to which the pelorus is set if accurate results are to be obtained, or else a correction must be applied to the observed results. Perhaps the easiest way of avoiding error is to have the steersman indicate when the vessel is on course. This is usually done by calling out "mark, mark, mark" as long as the vessel is within a specified fraction of a degree of the desired heading. The observer, who is watching a distant object across the pelorus, selects an instant when the vessel is steady and is on course. An alternative method is to have the observer call out "mark" when the relative bearing is steady, and the steersman note the heading. If the compass is swinging at the moment of observation, the observation should be rejected. The number of degrees between the desired and actual headings is added if the vessel is to the right of the course, and subtracted if to the left. Thus, if the course is 060° and the heading is 062° at the moment of observation, a correction of 2° is added to the bearing.
The instrument was named for one Pelorus, said to have been the pilot for Hannibal, circa 203 BC.
Ancient instrument
Harold Gatty described the use of a pelorus by Polynesians before the use of a compass. In equatorial waters the nightly course of stars overhead is nearly uniform during the year. This regularity simplified navigation for the Polynesians using a pelorus, or dummy compass:
[Arabs] divided the horizon into 32 points. These points were derived from fifteen stars which rose at approximately equally spaced points of the eastern horizon. The setting points of these stars on the western horizon gave them another fifteen points and north and south brought the total to thirty two.
These accomplished navigators [Polynesians] had names for one hundred and fifty stars. They knew the point on the horizon where each of these rose, and the time at which it did so. They knew the islands which each passed over.
Many of the peoples in the Pacific used the thirty two point dummy compass…I consider this…proof of the Indo-Malayan origin of the Polynesians
."
The two hooks are in place on one side, the eye screws are not there.  Let us know if you have any questions or need additional pictures.  Don’t be shy to make an offer, we are always open to reasonable suggestions.
Make sure that this item meets your needs and requirements before deciding to acquire it.   The item can be returned, there is a 10% restocking fee to do so.
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ask all the questions you have, come see in person or send a friend to see the item on your behalf, prior to deciding to acquire it.
Please check out our other Timeless Tokens store listings as we are regularly adding new items.  We specialize in antique and vintage artwork, books, collectibles, furniture, musical instruments, paper ephemera, marine/nautical, and clocks.  Thanks for your business. (E18033).
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