I will have to check on my tritium compass, it is semi-lost somewhere in the piles, but will be going on 10 years old, and was surplus . A clinometer on a compass lets you measure the steepness of a slope, or the height of an object. This is a glue-like substance that mixed with a phosphor, (Shapiro used zinc orthosilicate) can be painted onto surfaces. Secondly, the ability to easily navigate in really difficult terrain is far better and more accurate. At that point, dials and hands are usually replaced if nocturnal legibility is desired of course, do that to a vintage watch whose high value rests on originality of all parts, and you may have a watch you can read at night, but you will have destroyed its investment value. Any use of this content without express written consent is prohibited. in The Cammenga Model 27 Phosphorescent Lensatic Compass is built to the demanding specification MIL-PRF-10436N. Waterproof to considerable depths. Have Tritium on a couple of 1911s and have never had on a rifle. If I lived in the Rocky Mountains, I could probably find a use for it. Once the pivot is bent, the dial will not produce repeatable, accurate readings. Tritium, like promethium, is a low energy beta emitter; unlike promethium it has a much longer half-life 12.32 years, which makes it a better excitant for long-term applications like watch dials. While the exact quantum mechanical description of photoluminescence is complicated, the basic idea is simple: if an electron orbiting an atom in a certain material absorbs a photon, it will be excited to a higher energy state, and when the electron "relaxes" to its ground state, it emits a photon which we see as visible light. It is my backup compass. Definitely worth the extra tariff. The first one I lost on a hunting trip, and when I went back to look for it, well, the olive drab paint is difficult to spot in the grass. Reviewed by Features of Cammenga 27 Phosphorescent Lensatic Compass without Tritium. One new winner* is announced every week! It's cheaper. Price Paid: $150, Reviewed by The Cammenga Lensatic Compass. That dry card housing can't ever form a bubble or leak. Many were unpleasant where accuracy was/is critical. This compass is also functional from temperatures ranging from -50F to +150F and is . Instead, it incorporates a material known as strontium aluminate, which is an extremely efficient phosphor that once charged, will glow very brightly initially, and with diminishing intensity for several hours thereafter. I've kept it in the car for road trips (this was pre-GPS) for those times where I was intentionally and utterly lost (and strangely happy. Founded in 1992, Cammenga is a leading manufacturer and supplier of military-grade navigational and tactical gear. n comparison, my liquid damped Suunto baseplate compass with 'global needle' settles in one second or less, and stays rock-steady, with no wobble. , which means you can "set it and forget it" when it comes to adjusting for declination. Eutrophication results from continuous pollution in the form of agricultural run-offs or sewage outflows. However, lately I have been doing map reading instruction for new hunters. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Or you could use the mils scale and convert each and every azimuth (bearing) back into degrees so your friends on the trail could understand what course you're using. Tritium has a half life of 12.3 years so its brightness will start to fade after that and most manufacturers give the tritium illumination a longevity of between 10-20 years. . There is absolutely, positively no scenario in which a radium dial, if it's a real radium dial, will not produce a signal when tested with a Geiger counter. hassle. Take that as a plus or minus, depending on your perspective. For a better experience, please enable JavaScript in your browser before proceeding. The aluminum body is durable and will handle rough travel, but remember it's a compass, not a hammer, so treat it well and it will serve one for life. I haven't ever needed the tritium version other than military uses.and the non-tritium would have worked too. However, if you're going to navigate in situations that could end up being survival situations, spring for the 3H. Pro-Line Stand Mixer is a powerful and floating compass dial is designed to be used in any situation - at sea, on land, in the air - and it works even if you're wearing gloves. Tritium..if the cost isn't an issue.why not..would it hurt to have it? Military Phosphorescent Lensatic Compass has been used as an economical alternative to the Tritium model, brief exposure to external light charges the phosphorescent markings for night time use. Rolex had to recall the watch and replace the bezel thanks to the excessive radiation the bezel emitted, and original bezel 6542 watches are therefore extremely rare. It is adversely affected by moisture, so a high humidity climate might cause issues, but in general, Super-LumiNova and other strontium aluminate-based pigments seem likely to be with us for a long time. Anyone who's played with a UV lamp has seen materials fluoresce. 1960s era black light poster. It is more accurate than a regular plate compass, it is light weight (about 2 oz. I got a good deal on a Cammenga tritium compass last week. I have popped out on other people's property, and not known if I'm facting North or West. If a lot, the get the tritium. It is chipping off on the corners. The current manufacturer and government vendor of the M-1950 compass is the Cammenga, LLC out of Dearborn, Michigan. El ciudadano reportero Johnny Bohorquez envi estas imgenes con el siguiente comentario: "En el barrio Las Gaviotas (entre las manzanas 29 y 28) se ha venido presentando un problema con las tuberas de aguas negras. Want a free ebook on Land Navigation? A not-negligible point for some is this next one--no available declination adjustment. Battle tested through rigorous shock, water, sand proof, and functional from -50 f to +150 f. The phosphorescent lensatic compass has been used as an economical alternative to the tritium model for decades. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Note that while this model'sdry card housing can't ever form a bubble or leak, it can certainly fog over in cold weather or condense moisture inside the case fromhumidity changes in tropical regions. Our quotes are based on historical sales and real-time market data allowing us to give fair prices without all the It has no romer scales, and only one 1:50,000 metric scale, which isn't much use for USGS 1:24,000 topos. The cross hair style lensatic compass is EXTREMELY accurate. The Silva was good but the 3H is far better. This one seems to be at the end of its . $66.15. Clipping is a handy way to collect important slides you want to go back to later. Sale price: $37.50. I bought two of these compasses over the years. If you just need to occasionally find the cardinalpointsor orient a map correctly, this compass is probably overkill. I like the locking card, the tritium dial and the maginifier. But it can fog over in cold weatheror from moisture andhumidity changes in tropical regions, since the interior is filled with ordinary air, not purged with inert gas like your fogproof binoculars or rifle scope. But what people don't tell you it that it also has an extendedpivot that can bend with a significant shock such as a drop onto hard ground. It too is 5 stars. I've always been a major fan of this compass. At this point, I'm not affiliated with them, but I'm glad I ran across them. +159 April 6, 2012 Kjellstrom introduced the sport of orienteering to the USA in 1946. Thank you! The second quibble is that the scale markings along the straight edge available when the compass is completely open are suitable for 1:50,000 scale markings, but some of the markings (specifically, those for 2000 and 4000 m) aren't marked so as to quickly distinguish them from neighboring marks. It is bulky. Be weary of a summit that begins with sharing bread; for the sated man is at his weakest. Suunto A-30L Field Compass The compass is not as easy to learn as a baseplate or sighting protractor compass. An accurate and tough compass that will give a lifetime of service. at CampSaver.com. An alert reader pointed out to us, in the comments in our article on radium as a radon hazard, that close to a thousand buildings in Switzerland may be radium contaminated. On the one hand, we would like to be able to tell the time in the dark without dropping a hundred large on a minute repeater. You can also get some pretty high wow-factor visual effects with Super-LumiNova that have much better permanence than they would have with radioluminescent pigments; Bovet has used the material to great effect in the Rcital 22 Grand Rcital, as has MB&F in the Black Badger collab version of its Starfleet Machine. I was already a lensatic fan for years so using this model was an easy transition. Night Fision night sights carry more tritium than the average night sight on the market and a domed lens engineered to create the a crisp, defined glow. +108 I talked to Cammenga and they said that they could send touch up paint free of charge or I could send it back for repair. I wanted to learn how to use a lensatic compass, and wanted one that I could also rely on. This Phosphorescent Lensatic Military Compass is the same compass Cammenga has been supplying to the US military, except the tritium has been replaced with phosphorescent paint. Some compasses come with asighting mirror, which allows you to "shoot azimuths," similar to a lensatic compass. As was previously stated that is very dangerous. Phosphorescent lights and Tritium micro-lights are the two most common forms of luminescent indicators. Waterproof to considerable depths. Price Paid: $50, Reviewed by AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Durable, accurate, and not too terribly difficult to learn on. You probable wouldn't even need a ponch. Phosphorescent materials, like fluorescent materials, absorb photons from a light source, and re-emit those photons as light, but they do so very slowly over a period of many hours, in the case of phosphorescent paints used for watch dials. April 28, 2009. With some basic instruction it can be learned with very little effort. *Must have a registered ARFCOM account to win. Well-made, but less than ideal for non-military users. Unlike radioluminescent materials, such as paints and pigments using radium, tritium, and promethium, Super-LumiNova uses no excitant at all. They know not of what they speak. Given the accuracy issues, you can do just about as well with an ordinary baseplate compassheld at chest height, and pointing the direction-of-travel arrow at the objective. Took it out of the case and flashed it for three seconds with a bright led light. :faint: A forum community dedicated to Glock firearm owners and enthusiasts. I would never willingly own one without Tritium. View All Outerwear, Clothing, and Accessories , Top 25 Our patented injection molded sleeve design holds our tritium vials securely in place using ballistic materials. The compass dial should turn freely, but not too freely. 4 stars for accuracy and occasional pivot point/card slip, but for the $, it's great. Explained somewhat more thoroughly, they are weapon sights usually though not always assumed colloquially to be on a pistol designed to allow a shooter to find and align his or her sights in the dark. The half-life of tritium is 12 years so the glow will slowly fade. Fully opened. Easy reading too. Copyright 2013-2019 Collingwood Publications LLC. Price Paid: $79.95, Reviewed by For my most recent compass, for instance, I chose, a Suunto M-3G, one with 1:25,000, 1:50,000 and 1:24,000 scales. Tritium is way to go. As a result the M-1950 isn't as well-suited to use with USGS topo maps and GPS units for plotting location as a more modern baseplate compass. Quoted: Tritiums half life is 12.32 years. Reviewed by I don't care about miles--it's meters and kilometers for me. Ever. Bill Then, in another 12.3 years, it's going to be half of that half, or 1/4 of the original.then, in another12.3 years, it's going to be 1/8. Step 6. Seiko is one manufacturer that used promethium-147 as an excitant; the half-life of promethium is only 2.62 years, and so any promethium dial watch is likely to radiate only very weakly if at all. I have a Suunto MC-2 Global (plate compass w/sighting mirror). December 27, 2009. Also, since induction dampening doesn't work as well as liquid dampening, the compass dial wobbles about and takes up to six seconds to settle before a reading can be taken. Given the accuracy issues, you can do just about as well by using an ordinary baseplate compassheld at chest height, and pointing the direction-of-travel arrow at the objective. Light is composed of energy packets known as photons (the photon is the quantum particle of the electromagnetic field). July 15, 2019. Features of Cammenga 27 Phosphorescent Lensatic Compass without Tritium. The beta radiation from tritium makes the phosphor glow. I prefer the Tritium .mil style compass since it is what we used and trained with regularly (former 19D). And, finally, it has no mirror. Hated the cheap ones in the Army. Its sighting system does not require one, however, and for practical purposes the mirror is not missed--but if you want to check your hair before exiting the tent in the morning, you'll have to carry a separate mirror. Suunto MC-2 Compass; 2.8 9. [ARCHIVED THREAD] - Why Tritium over Phosphorescent compass. I went outside in the dark. MSRP: $40.00. Other than the fact that its luminosity diminishes over time, Super-LumiNova appears to be a near-ideal solution to the problem of nocturnal visibility. The decay chain finally ends in a stable isotope of lead, but you get things like polonium and thallium en route. My 159-page, fully illustrated book is yours for the asking. I have not used one, but I imagine the USGI lensatic compass does not have this problem. It is very accurate and easy to use and with the non liquid dampening system it is not effected by the extreme temperatures. A more minor criticism is that theM-1950 compass dialhas noprotractor feature, so you needto carry a separate protractor to take a bearing directly from the map. M-1950 lensatic is only required to achieve an inherent accuracy of + - 40 mils (2.25 degrees) from actual azimuth (milspec). Source: bought it new Just a word of caution. Performs flawlessly in temperatures ranging from -50 F to 150 F. Uncompromised by temperature changes due to its non-liquid filled needle housing. Tritium sights glow in excess of 10 YEARS. Then there is the issue of inherent accuracy. I lent it to my son and he returned it missing the lens. I just bought the tritium compass about one month ago, glad I did. And with the Tritium vs phosphorescent counterpart you wont need a light source to charge it up if your like me and do night nave. I would definitely recommend either one of these compasses to any one. Strontium aluminate seems to be a highly stable phosphor, and Super-LumiNova dials, at least thus far, appear to not suffer from the gradual phosphor degradation characteristic of radioluminescent materials. Invented by Bjorn Kjellstrom, his brother, and some others, it has become the world's most popular compass style. Shipping calculated at checkout. In summary, the M-1950 lensatic compass as made by Cammengais a specialized military item that sorely needs a redesign for use as a general-purpose wilderness navigation compass for civilians. I really don't see myself navigating in the dark. Not too freely bent, the ability to easily navigate in situations could. 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Just a word of caution that could end up being survival situations, spring for the sated man at... Is EXTREMELY accurate the M-1950 compass is built to the USA in.. Cardinalpointsor orient a map correctly, this compass up being survival situations, spring for the ARFCOM newsletter. 1992, Cammenga is a gathering place for firearm enthusiasts of all types lensatic compass it... Diminishes over time, Super-LumiNova appears to be at the end of its use a lensatic.! 'Ve always been a major fan of this content without express written consent is prohibited to any one of.! Bright led light a glue-like substance that mixed with a UV lamp has seen materials fluoresce one. Was good but the 3H tritium dial and the maginifier it to my son and he returned it the!
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