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The front of the hardwood case has a handle and a unique front rotary clasp. Again, it will not do to argue that extra sets of dies existed, and even if they did, it is difficult to think of a reason why the horizon bracket might have been modified in the middle of a war that was slowly being lost. If the error is less than 0Â° it should be added to whatever reading is obtained – if more subtracted. The threads of the tangent screw, which is held captive in a bearing attached to the back of the index arm, pass through a nut in the sliding block.
The Sextant Geocoinâ¢ is trackable on Geocaching.Com and has its own icon. Usually, a limb of brass was screwed and sweated on to the face of the bronze frame and a dovetailed segmental groove machined in it. The Stanley London 6-inch radius antique reproduction brass sextant comes in an antique patina. A few shrinkage cracks in the case required refilling and the sextant pocket had disintegrated, so this had to be re-assembled and made fast again to the floor of the case.
They follow the (Apple could have done it better though), first introduced in iOS 7 and supported in all later releases up until now (at least iOS 11). The latter had only recently been invented at the time this sextant was made. Trademarkia makes the process easy and convenient, so Trademarkia.Com is a free search engine of publicly available government records.
The rise and fall mechanism for the telescope is conventional: Having overcome these various obstacles, it was time to reassemble the instrument and adjust the mirrors to ensure they were square to the plane of the arc and, when the scale reads zero, that they were parallel to each other. I donât know exactly what the naval number indicates, but assume it is the unique identifier for naval stores purposes. The case is made of high quality quarter sawn mahogany, from an era when such precious woods were available solid in substantial widths (Figure 1). I got a 10 minute phone demo, and then I was ready to go.
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Furthermore, I have been able to examine an indisputably C Plath sextant, whose serial number falls between those of the two probable fakes, differing by only 289 from one of them. A screw held captive in the frame enters the threaded hole in the tongue and rotates the mirror to correct for index error (Figure 8). Fig 6 Fig 7 The limb and the rack of the Plath sextant are both of the same radius, while in the SNO-M, the edge of the limb has been machined away and its radius is about 1 mm less (Figure 7). With these, the navigator pre-computed his sight and then noted the difference in observed versus predicted height of the body to determine his position. The adjusting nut needs a special tool to adjust it and recently someone asked me where such a tool could be obtained.
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This sextant has a beautiful antique patina and measures 5 inches tall, 5 1/2 inches wide, 3 1/4 inches deep, and weighs one pound. Figure 7 shows how two small dominoes have been used, but any two identical objects objects of about the right height may be used, such as pieces cut from aluminium or steel angle, large hexagonal nuts or large rollers from a scrapped roller bearing.
Rare Vtg Cassens & Plath C&P Sea Marine Sextant 1 West Germany DHI 47/01/78 MINT
I had one map where I made 110c…Keep in mind we aren't talking about lucky item drops. The USPTO has given the SEXTANT AVIONIQUE trademark serial number of 73806360. Naval Observatory numbers assigned when the instruments were inspected there). This treatment did not agree with the ivory main and vernier scales which had shrunk so that the main scale was loose and the vernier scale had cracked around the rivets which attached it to the index arm. The last production instrument was Plathâs Navistar Professional and as I have not previously given any cover to that, I will take a detailed look at it.
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