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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Can anyone tell me What this is
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Thread: Can anyone tell me What this is Reply to Thread
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Topic Review (Newest First)
08-08-2011 08:57 AM
weephee Thanks for the information. I did get it open and there is a fixed plate beautifully engraved with north, south, east and west. There is a flip up arm with a vertical hair line which you line up with a mirror image on the underside of the hinged lid. There is a floating needle. A neat piece which is well made. Thanks all
08-08-2011 08:48 AM
dacap06 At first I thought it was a question generator. But now that I think about it, I think the others are right -- its is a Pelorus.
08-07-2011 04:08 PM
CaptainForce
Quote:
Originally Posted by hellosailor View Post
........... A pelorus is just a bearing finder, it has no magnetic abilities.
'sounds right & it appears to be without a floating card or needle. I agree.
08-07-2011 02:15 PM
hellosailor Force, if his gizmo has no magnetic needle or card in it, it could be a pelorus. But if there is a "north seeking" needle or card, it is a compass. A pelorus is just a bearing finder, it has no magnetic abilities.
08-07-2011 11:12 AM
PaulfromNWOnt Top picture: Bottom right appears to have a little nubbin (technical term meaning thingy) that you'd pull out to release the top cover to swing away from you like a laptop screen.

Third picture: That hinge is for the "sight" to pivot up on.

The reason you can't see the W, S, E marks is because they are on a fixed plate that swings with the device, and there is a needle/arrow that indicates the direction being sighted.

They used similar devices in fire towers.
08-07-2011 08:40 AM
CaptainForce
Quote:
Originally Posted by hellosailor View Post
............ "lensatic compass" or "army compass" this looks to be the same thing but................
......as a nautical instrument, known as a "Pelorus". Take care and joy, Aythya crew
08-06-2011 09:58 PM
cyber8r
Quote:
Originally Posted by hellosailor View Post
Look up "lensatic compass" or "army compass" this looks to be the same thing but much nicely made from brass. The cover with the glass would flip up on the hinge, the brass tongue you see under it should also flip up. Then you sight through the end of the "tongue" and the glass, which should have a prismatic effect allowing you to see the compass reading (bearing) directly under the image of what you are looking at.

If the hinge is frozen try a little PBlaster on it to get it started again.

A modern pot metal lensatic compass is usually a $5-10 item on the shelf at any camping store.
Very cool I'll bet you get a lot more than that on E Bay
08-06-2011 09:48 PM
hellosailor Look up "lensatic compass" or "army compass" this looks to be the same thing but much nicely made from brass. The cover with the glass would flip up on the hinge, the brass tongue you see under it should also flip up. Then you sight through the end of the "tongue" and the glass, which should have a prismatic effect allowing you to see the compass reading (bearing) directly under the image of what you are looking at.

If the hinge is frozen try a little PBlaster on it to get it started again.

A modern pot metal lensatic compass is usually a $5-10 item on the shelf at any camping store.
08-06-2011 08:45 PM
erps Old army compasses had the lid open up and then a sight fold up as well to take bearings. Looks like a fold up sight visible through the glass.
08-06-2011 08:16 PM
HDChopper What ever it is it is Very cool

as for opening ...the round hinge is the hinge ..the square one is the (toung & groove) is the latch , IMO as a machine man ....
I imagine the latch is spring & ball or spring pin type..
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