Wwii Binoculars Military - Original item: Only one available. The M13 and M13A1 comparisons were issued to all branches of the US military during World War II. 43, 378 were produced at an original cost of $72/ea. They are marked on the left binocular M13 6 x 3.
This example is offered in excellent condition with clear optics and original case, carrying case and M17 shoulder strap. These are often found without a case, making this pair of sets hard to find. Both focus diopters work, although the left one is more rigid, due to dry grease on the thread. The right diopter moves slightly.
Wwii Binoculars Military
The Binocular M3 is an excellent piece of equipment, but after a number of M3 binoculars were released, many difficulties were reported due to the nature of World War II military operations. As a result of these reports, a focused study of the smallest details of the Binocular M3 was made, which eventually led to the development of the Binocular M13. The first issue to consider in the development of the M13 from the base M3 is the waterproofing of the device to withstand the suppression. This was achieved by redesigning the cover plates for the use of a synthetic rubber gasket and more fastening screws. In addition, the Ordnance Laboratory has developed a new military wax capable of withstanding extremely high and low temperatures to seal the objective lens and objective assembly. This connection, specification FXS, replaces the navy black ceiling with connection number 3A. It resists cracking to -50 degrees F. and No. 3A compound has a melting point of 150 degrees F. to 210 degrees F. The formula contains a fungicide to repel mold and insects. Shock and vibration tests show that a severe shock has shifted the original prism assembly, affecting the optical alignment of the instrument. Experimentation with methods of mounting the prism led to the use of dental cement. This cement is a mixture of copper oxide powder, phosphoric acid and zinc chloride solution. The ingredients are mixed in a ratio of three parts powder to one part liquid. Additional tests have shown that prisms mounted with this agent are firmly locked against any shock. Another serious problem that applies to all telescopes is the formation of moisture on the optical elements in the finished instrument. In any binocular, moisture can enter the optics and condense, as any device with an adjustable threaded eyepiece movement cannot be perfectly sealed. This type of formation is most affected in a T-graded reticle, where the slightest dot becomes visible and distracts the user. An airplane high in the sky first appears as a tiny dot suspended like a speck of dust under the magnification of a binocular eyepiece. The experience gained in the packaging of complex articles for export with dehydrating agents was used to solve this problem. A special cartridge shown in the small illustration, containing a small amount of silica gel, is placed in the body of each binocular. Devices treated in this way were tested under the most adverse conditions of humidity and rapid changes in temperature, which indicates that the desiccant eliminated the formation of moisture on the optics over a long period of time. A way to make the binoculars more usable in low light conditions was undertaken. American telescope would be effective an hour later in the evening than the enemy would be a great advantage for American troops. Therefore, the development of the optical industry - coating optical surfaces with magnesium fluoride film to reduce light loss through reflection - has been studied by the army and navy for some time. Through thorough research by the Army, Navy, and related commercial facilities to perfect magnesium fluoride and other coating techniques, the coatings are engineered to withstand cleaning in all field conditions. Magnesium fluoride coating is applied to high temperature optical surfaces under high vacuum and the fluoride becomes part of the glass surface. This coating reduces light reflection and allows more light to pass through the optical system, enabling the binoculars to be used at dusk when the light is dim. After the time and money spent on making the perfect binocular, an improvement in the export method is included as further assurance that the binoculars reach the end user in factory new condition. The binoculars are housed and sealed in their special leather carrying case and padded in a five-ounce silica gel, moisture-vapor-resistant bag in a corrugated cardboard box. Twenty-four such cartons are packed in a waterproof bag liner in a steel-bound wooden box. This new M13 binocular is now in mass production. Thousands of them are sent overseas every month to American fighters to help them see the enemy before the enemy sees them. Of course, the Ordnance Department is never satisfied with the perfection of the armament of our army. Further improvements are now underway to ensure that American binoculars are the best in the world.
Original German Wwii Spindler & Hoyer (fvs) 6x30 Dienstglass Binocular
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