Prismatic compass surveying and whole circle bearing reading. The case cover should be pointing toward the top of the. With a section on the methods of finding direction and approximate time by the stars. Uses of prismatic compass the prismatic compass is a small instrument which is held in the hand for observing, and is there employed on the rougher classes of work. Differences between prismatic and surveyors compass. Francis barker prismatic artillery compass compass library. A rare and very high quality artillery surveyors prismatic compass, made in britain by francis baker and dating from c. Liquid filled prismatic compass is a robust, precision instrument of predominantly brass construction, designed to withstand most arduous climatic conditions. Three models of the francis barker tritium m73 and m88 mil. The traditional milspec liquid prismatic compass is currently in service with numerous armies around the world, built to meet the exacting accuracy and high specifications demanded by users worldwide. A very good example of a francis barker m73 prismatic military marching compass.
Finally figured out the smell was the fluid leaking out. British made, these are standard issue to uk armed forces and were used in iraq and afghanistan. Still in use by the military today, the m73 has long been recognised as the worlds finest military prismatic compass. Everyone knows that ferrous metals and compasses dont mix and a compass certainly should not be stored next to a clip which can affect the magnetic field of a compass. You need to be registered and approved to bid at this auction. Not quite the same thing i know but a very good bit of kit which will do all that the prismatic will do. Has a foldable metal lid for easy storage and transport. Find here information of liquid prismatic compass selling companies for your buy requirements. It was liquid dampened and also fit nicely in the pocket. Prismatic liquid compass army pattern black finish product description. The black m73 is supplied complete with leather pouch and full instructions. Examining the liquid prismatic compass with thanks to member trademarklondon for this video. Prismatic compass by f barker and son 1932 ltd, marked mo 6404454, no 1926, cased.
The interior silvered turntable ring is gradated in black numerals from 1 to 36, with additional markings in between and is held in place via eight brass screws and covered by a circular glass plate, the plate. Silva do a model 546400b aka 454 prismatic compass which does not actually have a prism it has a sighting lens allied with a mirror in the capsule and a proper compass card rather than just a pointer. M73 mils black liquid prismatic compass pyser optics. I first handled one back in the eighties and was very sad to have to hand it back at end of the exercise.
We are one of the prominent manufacturers of liquid prismatic compass. The francis barker traditional military liquid prismatic compass is currently in service with many defence forces around the world and has been for many years. Offering made in india products comparable to the best in. Francis barker surveyors and artillery prismatic compass. The m88 liquid prismatic compass is built to the same exacting standards as the m73, but is made largely from aluminium alloy, making it very lightweight. Brass and aluminium case with lid, liquid filled, calibrated in 12 degrees, and can be tripod mounted. Step action 1 open the compass so that the cover is fully extended. Black antique this nautical solid brass british prismatic compass is in polished brass finish. This m73 brass presentation compass is fully ruggedised and will operate with precision accuracy to within half a degree, in temperatures from 55c 1f down to 30c 22f. Francis barker m73 prismatic compass the british army prismatic marching compass m73 has become a classic of its time. Five selfluminous tritium light sources enable full night and daylight operation.
A small button in the rear of the compass activates a needle freeze mechanism to hold a compass heading for easier reading. The video is not a demonstration of how to service a liquid prismatic compass, but is an indication of the problems an unqualified person will encounter should they try to do it themselves. It is much lighter than the classic m73, but equal to it in terms of performance. Prismatic compass by f barker and son 1932 ltd, marked. Thats k peter to blame australia and i am sorry for your loss guess it was in the pursuit of science and potential future conflicts and believe me i am not trying to start a full on discussion or trying to stir up an argument i am just presenting the facts about this stuff save to say our govt showed scant regard for the citizens of this country in allowing nuclear tests on the main land and. Read, highlight, and take notes, across web, tablet, and phone. Military liquid filled lensatic prismatic compass with pouch features. The compass bounces around inside the case and the metal alloy belt clip on the back of the compass is ferrous. Solid reliable brassaluminium and glass construction.
The table below lists the steps to perform the centerhold technique. Contact verified liquid prismatic compass manufacturers, liquid prismatic compass suppliers, liquid prismatic compass exporters wholesalers, producers, retailers and traders in india. Liquid filled compass can be used in land or sea by architects, engineers, yachtsmen, foresters, geologists or defence forces for direction finding during day as well as night. For the best chance of winning, increase your maximum bid. The following are the essential parts of this compass. The m73 liquid prismatic compass is a robust, precision instrument of. The m73 liquid damped prismatic compass is a robust, precision instrument made in the united kingdom for military use. Liquid compass liquid type lubber line lubber mark luminosity luminous paint magnetic bearing magnetic needle magnetic north magnetic poles magnetic variation measured method minutes of arc mirror compass national physical laboratory necessary needle points night nightmarching notch number of degrees object observer. It is a very fast, synthetic view of a job that actually takes. Francis barker m73 black liquid prismatic compass degrees model view images. Quick, precise settlement of the liquid filled dial assembly allows rapid use of the compass in field conditions. Degrees version comes in mils version solid reliable brassaluminium and glass construction.
This compass is the direct descendant of the legendary mkiii that was in use throughout the second world war. Similar to the fb1204 model which was in production until the late 1990s. Compass collector verners pattern compasses page 1. The francis barker traditional military liquid prismatic compass is currently in service with many defence forces around the world and. North arrow of the lensatic compass will point 11 degrees west of true north. In 1895 f barker produced a verner compass nos 327 and j h steward produced both a verner compass, a major verners sergeants compass and a major w verners patent night marching comapss which were all pocket compasses and not prismatic compasses. This famous compass has been proven over many years in all world regions in surveying, artillery, satellite positioning, and compass. Click on the links to access the generic chapter s dedicated to a cerrtain type of compass 186875.
The black m73 francis barker compass is supplied complete with leather pouch and full instructions. Place the fully opened compass on the map with the scale edge alongside a northsouth meridian longitudinal line, grid line. Francis barker m73 black liquid prismatic compass degrees model. It is shock resistant, and built to withstand the roughest and toughest conditions you are likely to encounter anywhere in the world. Francis barker m73 brass prismatic military compass for. The prismatic compass in this compass, the readings are taken with the help of a prism. Prismatic compass at best price in india indiamart. A 1944 canadian mk iii prismatic compass immediately above these marks is a ring etched in single degrees around the circumference. That leads to a compounding inaccuracy of the compass over time. The compass has a beautiful black finish and the compass measures 2 38 inches 60 mm in diameter, 3 38 inches 85. Metallic liquid filled prismatic compass military model. Compass surveying is a type of surveying in which the directions of surveying lines are determined with a magnetic compass, and the length of the surveying lines are measured with.
Eventually i obtained my own and i thought i would write a few words for people that have. Francis barker m73 black liquid prismatic compass degrees model mini dismounted search kit. This combination is augmented with an illumination component that helps to provide one of the most accurate compass readings of any type. M73 degrees black liquid prismatic compass pyser optics. If its a francis barker m73 the newer ones are, plastic bodied usually dont know if they have any policy about letting the monkeys know about your exmil acquired compass, as i approached them with my receipt and proof of purchase some 25 years ago. Since 1848, pyser optics have been manufacturing the finest, highest quality range of liquid prismatic compasses in the world. Key features the best handheld military compass in the world. This american site overflows with useful information about pocket compasses. Generally regarded to be one of the finest compasses available. Compass, prismatic, mk3 by peter laidler i am a compass maker by trade, and this article, while obviously written in good faith, gives fatally flawed information that will lead people to carry out work on beautiful, precision instruments, that will do such damage as to possibly render the compass beyond economical repair. Hi everyone, i recently acquired an m73 above from an auction.
Questions about francis barker m73 liquid prismatic compass. The british army prismatic marching compass m73 has become a bit of a classic of its time. Built to meet the exacting specifications demanded by military users, it is the compass that officers of the british army have used for generations. Lightweight and rugged aluminum alloy construction. The dial assembly is mounted in a liquid filled sealed capsule designed to allow the full servicing of the. Francis barker m73 prismatic compass bushcraft usa forums.
The traditional milspec liquid prismatic compass is currently in service with numerous armies around the world, built to meet the exacting accuracy and high. Then just recently i had an odor coming out of the center console in my truck. The m73 liquid prismatic compass is a robust, precision instrument of predominantly brass construction, designed to withstand the most arduous climatic conditions. Francis barker m73 black liquid prismatic compass degrees. Prismatic compass one of the specialty types of magnetic compasses, the prismatic compassmakes use of a small capsule that is filled with oil and a magnetized dial. A prismatic compass is a navigation and surveying instrument which is extensively used to find out the bearing of the traversing and included angles between them, waypoints an endpoint of the lcourse and direction. See also nautical, pocket, escape, survey and wrist compasses. The best handheld prismatic liquid army compass in the world degrees version solid reliable brass and glass construction prism sighting system for highest accuracy liquid filled for rapid sighting full daynight use 5 tritium lights precision sapphire bearing full milspec build quality. Everyday low prices and free delivery on eligible orders. Hong kong featuring a mirror in an additional small cover and a hinged lens above the prism.