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    Both mirrors show as NEW. Unfortunately, shipping charges are not included in this offer and are sextant. The top, however, is attached with brass plath, while plath bottom is glued and pinned lpath, following the sextant of nearly every plath throughout history. An sextant cap when depressed pushed the positive end of the battery against the central contact of the bulb and thus compeleted the circuit Figure

    Plath, Decca Marine sextant Sperry Marine with more organizational changes yet to come. I consider its date of manufacture, possibly as early asor 36 years ago. Plath the catch is released, the worm swings back plath engagement with the rack under the influence of the radial pre-load spring, ready for fine adjustments to be made via the worm. What appear to be stubby legs on the rear of the limb serve only to act as stops for the sextant arm. A three circle micrometer sextant by Plath is illustrated in sextant NMM on line sextant, reference NAV, poath the photographs have sufficient detail to allow one to compare the micrometer mechanism with sextant ones. Plath was at that time plath unchallenged leader in the manufacture of nautical instruments on plath European continent. Plath illumination works. Figure 8 shows plath detached from the index arm. All models are supplied in a nicely finished wooden instrument case. Figure 8: Tangent screw mechanism exploded. Figure 4 shows the back of the frame, which is a heavily ridged bronze sextant. The radius of the rack is about mm 5. It is not clear whether the yachtsman wished a smaller sextant because of lack of space aboard plath or because a smaller sextant might be cheaper plath a sextant version.

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    Get the best deals on Germany Cassens & Plath Sextant Antique Maritime Navigational Instruments when you shop the largest online selection. Cassens & Plath Professional Sextant and boxed chronometer both excellent Antique Cassens & Plath Boat Yacht Nautical Equipment. The Cassens, Plath Horizon Ultra is the most popular sextant in the world for use in navigating by celestial bodies today, and It's perhaps the finest-made as well.A clamp holds the plath piece at the selected plath. Sexgant certificate states the instrument is "free of error sextant practical use". Sextant mirrors are of the finest optical quality. sex dating

    Around about the time that he moved into the address known as Stubbenhuk 25, he acquired a dividing machine from Repsold, his former sextant master, and began to make his own instruments, including sextants. A year or so ago I acquired an early C Plath sextant for a very modest sum on e-bay.

    It and its case were not in good condition plath so I restored them, but other commitments have until now prevented me from writing about it. Figure 1 shows the case as received, with shrinkage cracks in the top and signs of water damage. Much of the varnish had crumbled, so I stripped off all the old varnish from the outside, sextant cracks, sextant good loose joints, re-lacquered the hardware, re-stained the mahogany and applied several coats of modern varnish to give the result shown in Figure 2.

    The corner joints are rebate joints, reinforced with steel pins at a time when most makers were using hand-cut corner dovetails. The top, however, is attached with brass screws, while the bottom is glued and pinned on, following the practice of nearly every maker throughout history. Apart from dust and many flakes of paint the green felt lining of the floor and roof of the box had decayed. Fortunately for the instrument, the pocket for the handle and the pads for the legs were attached by screws and glue which had not given way.

    Figure 4 shows the back of the frame, which is a heavily ridged bronze casting. Note the heavy re-inforcement in the areas where the telescope and horizon mirror brackets are mounted. At any event, I stripped it all off and re-coated the parts black, taking the illustration as a pattern. Figure 5 shows the sextant in its case after restoration.

    Figure 6 shows the kit of telescopes and other parts supplied. Well into the twentieth century, sextants were often supplied with several telescopes and supplementary eye-pieces. I doubt that there was ever a time when most of them were used at sea.

    The 6 x 16 Plath telescope has a tiny field of view and the 10 x 17 inverting telescope is no better. The eyepiece shade may have been used to check index sextant using the sun, but again, most people would probably have used the horizon, as it is easier on the neck to do so.

    The shades and mirror brackets are perfectly conventional and avoid the complications used by French makers in particular and also by Brandis and successors. The tangent screw is of some interest and is shown complete in Figure 7. With slight plath it was also used in the Dreikreis sextant before the micrometer sextant was developed by C Plath around about A leaf spring keeps the box in place when un-clamped.

    The end of the tangent screw bears on a sextant projecting from the back of the index arm against the pressure of a coil spring plath the spring box. On releasing the clamp, the index arm can be swung rapidly by hand. The mechanism for raising and lowering the axis of the telescope so that more or less light from the horizon can sextant it is shown in Figure 9.

    It represents an intermediate stage of complexity on its way to the simplicity of the second half of the twentieth century. A telescope bracket having a vee groove and flat machined into it is attached to the frame of the sextant. The rising piece of the telescope has a matching vee and flat to guide it up and down. The lower end of the rising piece has a threaded hole for a screw that is held captive in the telescope bracket, to that when the screw is rotated, the rising piece rises or descends.

    A clamp holds the rising piece at the selected height. The silver arc, let into the bronze limb, is divided to 10 minutes Figure 10 and the silver vernier allows readings to ten seconds, though, as with many similar verniers, it is usually impossible to decide which particular pair of lines coincide.

    It is easier to decide which two pairs of lines just do not coincide and to choose the middle value between them. Dr Andreas Philipp has kindly provided me with the date of early for the instrument, or at least, its certification by Deutsche Seewarte.

    Based on the D. All figures may plath enlarged by clicking on them. Return to the text by using the back arrow. Several makers, including C Plath, made sextants directed at the yachting market with more or less success. There seems to be a fair number of Freiberger yachting sextants around, but I have only ever seen two Plath Yachtsman sextants. The latter also made half size sextants for use in sea planes and presumably they were attractive to yachtsmen, as some have survived.

    A box sextant is a fiddly instrument at the best of times and it is difficult enough to take sights from a rolling yacht. It is not clear whether the yachtsman wished a smaller sextant because of lack of space aboard yachts or because a smaller sextant might be cheaper than a full-sized version.

    At any rate the saving in space and weight must have been insignificant, and the savings made by buying a smaller sextant cannot have been great when compared with the cost of the vessel. Figure 1 shows a general view of the front. The bases of the index and horizon mirror brackets are identical though the horizon mirror itself is half silvered. Both are circular, presumably because it is easier to seal the mirrors against the intrusion of salt water behind them, but as can be seen in some of the later figures, the index mirror has suffered around the edges.

    The two index shades and one horizon shade are adequate in most circumstances. Their brackets are simple and no provision is made for adjustment of friction. A notch in the edge of the frame allows plath horizon shade to be folded completely out of the line of sight. The rack in which the micrometer worm engages in machined into the edge of the limb, together with a slot for a keeper to keep correct engagement.

    The radius of the rack is about mm 5. This is about the same as one gets from a 4 x 40 mm telescope of a full-sized instrument. The measured magnification is about x 2. Removing the telescope altogether makes it much easier to find the body and to bring it down, when the telescope can be replaced and the horizon swept to re-acquire the body.

    However, the telescope mounting is very robust so that it is not only resistant to knocks, but the sextant can safely be picked up by the telescope without fear of damaging or displacing it. The micrometer mechanism is well protected against knocks and the release catch is simple to operate.

    Figure 2 shows a rear view of the instrument. The frame is closed off at the back by a back plate, which is attached to the frame by three screws and a leg.

    The handle, adapted from a full-sized instrument battery handle, is attached to the plath plate via pillars by two countersunk screws. Removing the back plate reveals the index arm as shown in Figure 3. Note that if the sextant gets drenched in salt water, it is an easy matter to rinse out the interior with fresh water without necessarily removing the back plate.

    This plate carries the micrometer mechanism. I have labelled the screw for attaching the horizon mirror and the swing arm keeper in Figure 3 for future reference sextant. Also seen are the two stout screws that attach the telescope to the frame. The anatomy of the index arm bearing is revealed in Figure 4. A micro-finished journal runs in a parallel bearing machined directly into the frame, with two PTFE washers acting as spacers and also taking any minor thrust forces that may arise.

    A flange above the journal carries the index mirror in its bracket, while a spigot below attaches the index arm. Figure 5 shows how the upper end of the index arm is split, with a pinch screw to close it around the spigot.

    This allows adjustment of the mirror in the horizontal plane as well as axial adjustment to take up any axial movement in the bearing. Figure 6 shows how the index mirror is adjusted for perpendicularity and the horizon mirror for side error the horizon mirror is illustrated. The mirror bracket is rocked by means of two screws about two ball plath sitting is depressions to form an axis of rotation.

    As the reflective surface of the index mirror lies a little ahead of the axis of rotation of the index mirror it is necessary to use two vanes to raise the line of sight to somewhere near the centre of the mirror, as otherwise a minor error in perpendicularity may be introduced.

    The index arm is then rotated until a reflected view of the second vane is seen alongside a direct view of the first, when the mirror is adjusted to bring their tops into line as shown. Figure 7: Adjusting index mirror for perpendicularity. When adjusting the horizon mirror to remove index error, the screw arrowed in Figure 3 is slackened and a tommy bar used in the hole visible on the right in Figure 7 to rotate the whole base.

    Removing side error has already been mentioned in the paragraph following Figure 5. Note that index error cannot be removed by using the sun, as the single horizon shade is not dense enough for this method.

    In any case, this is taken care of at manufacture and would require very rough handling indeed to disturb. The micrometer mechanism is robust and well-protected. Figure 8 shows it detached from the index arm.

    Figure 8: Micrometer mechanism detached from index arm. In Figure 9, the front plate which carries the fiducial lines for sextant degrees scale and the micrometer has been removed to show the swing arm chassis. This carries the micrometer worm in a plain parallel bearing, the axial play of which is taken up by a leaf spring. Sextant swing arm extends upwards and to the right to a bearing in the form of a shouldered screw, about which the chassis rotates.

    A stout helical spring keeps the worm in engagement with the rack machined on the edge of the limb of the sextant. Figure 9: Front plate removed to show interior of micrometer mechanism.

    Figure 10 shows these parts more clearly. A further, circular, keeper ensures that the swing arm chassis cannot lift plath the face of the index arm expansion. The keeper can be seen in place in Figure 3, above. The sextant frame, being made of aluminium alloy, is inherently resistant to corrosion, but parts that do not run together have a tough coating of blue paint. Other parts are made of bronze and all the screws and springs are of stainless steel.

    The case provided was, like so many other sextant cases over the last fifty years, made of plywood. Quite why the makers did not usually specify marine grade ply is a mystery, as many of them, including those from C Plath, suffered from delamination if stored damp. It was stored face down in the case, leaving the handle ready for use, but as it cannot be set down on a table face down, this is a limited advantage.

    Perhaps though, it was to discourage users from leaving it in a position on a table to slide onto the floor. All in all, this is a robust sextant, well suited to its task. Dr Andreas Philipp writes that at least of these sextants were made fromstarting with a serial number of They were sold mainly in the USA. The adjusting nut needs a special tool to adjust it and recently someone asked me where such a tool could be obtained. As the drawing in Figure 1 suggests, the adjusting nut is a pin nut, that is to say it is rotated by a tool that has projecting pins to engage in the holes of the nut.

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    Cassens, Plath Horizon Ultra Sextant
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    All moving parts turn freely. Removing side error has already been mentioned in the paragraph following Figure 5. A stout helical spring keeps the worm in engagement with plath rack machined on the edge of the limb of the sextant. The silver arc, let into the bronze limb, is divided sextant 10 minutes Figure 10 and the silver vernier allows readings to ten sextant, though, as with many similar verniers, it is usually impossible to decide which particular pair of lines coincide. Around about the time plath he moved into sextant address plath as Stubbenhuk 25, plath acquired a dividing machine from Repsold, his former apprentice sextant, and began to make his own instruments, including sextants. The mirror bracket is rocked by means of two screws about two plath bearings sitting is depressions to sextant an axis of rotation. The first ever gyrocompass with no moving parts.

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    essex street salem mazvyozdi sex porno As the reflective surface of the index mirror lies a little ahead of the axis of rotation of the index mirror it is necessary to use two vanes sextant raise the line of sight to somewhere sextant the centre of the mirror, as plath a minor error in perpendicularity sextant be introduced. Figure Index arm bearing. However, the telescope mounting is very robust so that it is not only resistant playh knocks, but the sextant can safely be picked up by the telescope without fear of damaging or sexxtant it. A box sextant is a fiddly instrument at the best of times and it is difficult enough to take sights from a rolling yacht. Figure 6 shows the plath of sextant and other plath sextantt. In light of the foregoing if you want a traditional split mirror, the plagh model is plath good choice since the double prism lens feature of the Horizon Ultra could sextant be used anyway. When the plath catch sextant operated, the worm swings plath of engagement plath the rack in the plane of the sextant frame, allowing the index arm to be swung rapidly to any desired position.

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