Good quality 100% Aluminium Alloy Set Screw Grub Screws to Dominica Factories

Using a differential screw to make fine adjustments of about .0003″ per revolution. This may be used in a future project to adjust the tail stock of a O.D grinding device.
Tom’s video on differential screws differential screws https://www.youtube.com/watch?v=7RC8WL2ngfA&t=1199s
Robin’s video https://www.youtube.com/watch?v=4k261VAbWCU
Rupert Powell’s channel https://www.youtube.com/channel/UCbTMQzXEsqC5vFNAQWb7ofg
Ricard’s “Makin Sumthin From Nuthin” https://www.youtube.com/channel/UCsuJ_OqVw0LFXPbPwbZFW3Q

more at https://quickfound.net/links/military_news_and_links.html

NEW VERSION in one piece instead of multiple parts: https://www.youtube.com/watch?v=boQoxXY2yqI

“Assembling and testing the standard deep sea diving outfit.”

Public domain film from the National Archives with the aspect ratio corrected and mild noise reduction applied.

US Navy training film KN-9915-B

part 2: https://www.youtube.com/watch?v=5s0CeqeT60I

also see: The Diving Dress (1943)

https://www.youtube.com/watch?v=vsMNENXOues

The DESCO Mark V diving helmet has been in continuous production since 1942. As of 2012, it (helmet only) sells for $6,050. https://www.divedesco.com/catalog/product_info.php?cPath=22&products_id=162&osCsid=om4ughnnihk92si5of514djtd5

from US Navy Diving Manual Rev. 6

https://www.supsalv.org/pdf/DiveMan_rev6.pdf

MK V Deep-Sea Diving Dress.
By 1905, the Bureau of Construction and Repair had designed the MK V Diving Helmet which seemed to address many of the problems encountered in diving. This deep-sea outfit was designed for extensive, rugged diving work and provided the diver maximum physical protection and some maneuverability.

The 1905 MK V Diving Helmet had an elbow inlet with a safety valve that allowed air to enter the helmet, but not to escape back up the umbilical if the air supply were interrupted. Air was expelled from the helmet through an exhaust valve on the right side, below the port. The exhaust valve was vented toward the rear of the helmet to prevent escaping bubbles from interfering with the diver’s field of vision.

By 1916, several improvements had been made to the helmet, including a rudimentary communications system via a telephone cable and a regulating valve operated by an interior push button. The regulating valve allowed some control of the atmospheric pressure. A supplementary relief valve, known as the spitcock, was added to the left side of the helmet. A safety catch was also incorporated to keep the helmet attached to the breast plate. The exhaust valve and the communications system were improved by 1927, and the weight of the helmet was decreased to be more comfortable for the diver.

After 1927, the MK V changed very little. It remained basically the same helmet used in salvage operations of the USS S-51 and USS S-4 in the mid-1920s. With its associated deep-sea dress and umbilical, the MK V was used for all submarine rescue and salvage work undertaken in peacetime and practically all salvage work undertaken during World War II. The MK V Diving Helmet was the standard U.S. Navy diving equipment until succeeded by the MK 12 Surface-Supplied Diving System (SSDS) in February 1980 (see Figure 1‑8). The MK 12 was replaced by the MK 21 in December 1993.

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