He explains, “We worked on the Submersible Depth Gauge for a good five years. The idea of combining two of the key components of Panerai’s legendary trittico was certainly not lost on its dynamic CEO Angelo Bonati. The second version was rated to 30 meters and used for what the Italian Navy termed “defense missions”. The first version read depths to 15 meters and was used primarily for attack missions where divers would swim out to enemy objectives at relatively shallow depths, to either place ordinance on hulls, or guide their torpedoes to deadly destinations. Panerai’s depth gauges were calibrated in two versions, both using the Bourdon Tube system. So successful were Panerai’s depth gauges that they formed the cornerstone of the trittico: a combination of dive watch, compass and depth gauge that was standard-issue equipment for Italy’s naval commandos during the Second World War. Panerai Luminor 1950 Submersible Depth Gaugeįounded in 1860, Panerai first developed its expertise in patented luminous substance and the creation of military devices, one of which was the depth gauge. This adds a huge margin of safety during pre-dive safety checks. With the simple yet innovative design architecture of Jaeger-LeCoultre’s depth gauge, you can test if your depth gauge is functioning by simply pressing on the head of the system and observing the movement of the depth gauge hand. In other watches with depth gauges, the wearer must actually descend to depth or be fitted with an additional apparatus to determine if the depth gauge is functioning. While much has been made of the fact that pressing the head of the gauge allows you to demonstrate the principal of this extraordinary function to friends, a critical benefit to this has been somewhat overlooked. The maximum pressure that can be exerted on the head is 9.9 kg, which corresponds to the 80-meter depth limit of the gauge. ![]() ![]() This offers greater ease in achieving consistency, and also greater ease in repairing or calibrating the system.įinally, because the membrane system has a finite travel, after which additional pressure has no effect on it, the watch can be brought beyond its 80-meter maximum displayed depth, with no ill effect. Second, while the Bourdon Tube relies on the elastic property of metal to return to shape consistently, constancy of the membrane’s variable geometry is controlled by a special spring. First, the entire system remains outside of the watch, meaning that water never enters the watch, as it does in the GST Deep One. But it differs from the Bourdon Tube device in three very significant ways. Like the Bourdon Tube, Jaeger-LeCoultre’s membrane system relies on varying degrees of deformation caused by water pressure to derive a depth reading. One of the brand’s most famous innovations is the Atmos clock, that requires no winding and which derives energy purely from tiny variations in environmental temperature or pressure. The pressure contracting membrane is innately connected to Jaeger-LeCoultre’s history. What Jaeger-LeCoultre refers to as the watch’s membrane comprises 24 elements, and represents 1,500 hours of research and development. With this watch, your eyes are naturally drawn to the left-hand side of the titanic 46.3 mm case, where the pressure-sensing device for measuring depth is placed. Then, in 2007, Jaeger-LeCoultre launched a new dive watch that, again, catapulted the manufacture to leading position in mechanical dive watches: the Master Compressor Diving Pro Geographic. Jaeger-LeCoultre’s history in dive watches stretches back to 1959, when it created the world’s first dive watch with an alarm that could be set to signal the end of elapsed dive time, named the Memovox Deep Sea. Jaeger-LeCoultre’s Master Compressor Diving Pro Geographic
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