For many years I have tried to find a Desco
rebreather. These units are relative rare in Europe. Desco made
a A, B and C lung. I have been looking for a C-lung as my holy
grail, although Max Nohl his helmet would be even better ;). I
was fortunate to find a Buccaneer Lung or B-lung. This page
tells you about the history of this lung and his designer Jack
Browne. I have made a tear down of this wonderful American
oxygen rebreather. Please enjoy some diving history. The shown
B-lung was made in 1944 during World War II.
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History
of Jack Browne designer of the B-Lung
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Jack Browne was
also a survivor of tin can diving as a boy. His father was an
executive with the Goodrich Transportation Company in Milwaukee.
Jack became interested in diving while a freshman in high
school. He would take on jobs for pay or just dive for fun.
He also had a knack for invention and his first diving helmet
was literally a tin can. In 1934 he was working with Max Nohl
diving on local wrecks.
A captioned photo appears in The Milwaukee Journal April 4, 1935
of Jack and his friends Paul Gallun, Fred Lange, and Bob Wescott
testing a home made
diving helmet in a Shorewood swimming pool.
When Max Nohl and John Craig began work on the equipment for the
Lusitania salvage Jack was ready to pitch in.
The custom diving dress they needed was stitched together from
canvas and taken to the N.L Kuehn Rubber Company to be made
watertight.
Norman Kuehn was to become a mentor to Jack and an angel to the
new company. The Nohl, Browne, Craig collaboration in 1937
resulted in the
forming of Diving Equipment and Salvage Company. Jack was to be
president of the new firm but there was a problem. As a
principal in the corporation
he needed to be 21 years old. DESCO would not be formally
incorporated until May of 1938 when Jack became “legal”.
Mr. Kuehn signed on as Vice President, and a local attorney Earl
Wanacek as secretary/treasurer.
DESCO was located in the Kuehn Rubber Co. facility on north 4th
street. Kuehn himself provided financial support and business
advice.
After the Lusitania project collapsed and Nohl and Craig had
moved on to other things Jack determined to keep DESCO alive.
Through 1938 to December of 1941 the small firm plodded along.
Jack experimented with new designs for breathing tanks and
lighter suits.
With the outbreak of World War Two Mr. Kuehn urged Jack to go to
Washington. “Tell the Navy what you know about diving suits.
Show the boys what you have done and can do.” Jack did. In
January of 1942 he headed east and returned with a $5000 order
for three self-contained suits.
That first order led to others until DESCO was producing more
diving equipment than anyone else in the world.
Jack and DESCO were major contributors to the Navy war effort.
DESCO/Navy collaborative efforts led to the development of the
Browne Mask,
Lightweight Diving Suit, and Buie Diving Helmet. Navy Doctor
Albert Behnke worked with Browne and Dr. End on refinements in
deep diving on Helium.
Emerson Buie came to DESCO with his idea for a low volume diving
helmet to deal with mine clearance in harbors.
The US Office of Strategic Services asked Jack and DESCO to
build them compact Oxygen rebreathers for covert operations.
Along with special development projects was the day to day
operation of a company supplying 80% of the country’s diving
equipment needs.
By 1945 DESCO had its own pressurized wet tank for research and
development. On April 27, 1945, Jack used this tank to "dive" to
still a new
record depth of 550 feet of seawater. As in the case of Nohl's
earlier dive, he breathed a heliox mixture under the supervision
of Dr. End.
Both dives were milestones in the development of modern
techniques of mixed-gas diving. Max Nohl was asked how he felt
about Jack breaking his record.
Max replied "records are made to be broken".
In 1946, Norman Kuehn and Jack Browne sold the company to the
general manager E.M Johnson and a group of investors.
Jack moved on to help run the family automobile dealership
Browne Motors Chrysler Plymouth on 20th Street & North Ave. in
Milwaukee.
In June 1949 he became president of the dealership after his
father George passed away.
Jack makes the local papers occasionally, most notably for a
bridge on the Fox River in Green Bay having to open so he could
land his seaplane.
He also made the paper with a story on the spider monkey he
keeps on his yacht.
Not much more was heard from him until 1958 when he is flying
guns to Fidel Castro's Cuban rebels.
He is forced down by the Batista Cuban Air Force and imprisoned.
Browne managed to escape from prison and steal back his plane.
On the flight to Florida he runs out of fuel over the Florida
Keys. He was rescued by the Coast Guard.
Jack retired to the Virgin Islands and passed away in 1998 from
a heart attack.
Source: with kind permission of the Desco
corporation.
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Large number of
Desco Buccaneers are made for the US navy. (picture courtesy of
Desco corporation) |
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Patent |
When I
looked at the Browne patent, first thing that I noticed was the
unit was designed with the counterlung in front of the diver!
All photos show the unit with the counterlung on the back! This
is a very strange thing since there is also an extra valve
placed on the lungside as shown in the patent. It looks if the
unit was turned for the picture later. The following picture
shows the unit in use as described in the patent! |
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Please notice the CL is in front
of the diver and the extra regulator valve on the lung |
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Overview |
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Finally my own desco oxygen
rebreather! |
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The beautiful made weight belt
almost 70 years old!! |
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Clip for closing the
counterlung |
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The brass clip closes the
counterlung by pressing the rubber parts together. The rubber
has been made smooth a lining of canvas like material |
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canvas |
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A ring is attached to pull the
clip in opposite direction of the counterlung |
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Full brass clamp |
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Scrubber |
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After the clip has been detached
the scubber can be taken out of the Counterlung. |
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Inside the scrubber the
exhalehose is attached to the scrubber. This is the only hose
attached to the scrubber. |
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A tinned(?) surface prevent the
brass from corrosion |
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One side of the scrubber has a
fine mesh that is in direct contact with the inside of the lung |
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Diameter 24 cm |
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length ~28 cm. Resulting in a
1,3 ltr scrubber. To modern standard as a rule of thumb 1 kilo
equals 70 minutes so this scrubber could be working fine for 91
minutes. That equals the company's claim that the unit can be
used from 1 - 1,5 hour. Please do not copy this figures for your
design to built your own scrubber. The length to diameter and
WOB has to be tested and is very
critical! |
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The closing mechanism is
wonderful simple and effective! |
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Inside there are two plates
preventing channeling! |
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The plates are fixed with one
brass screw. |
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lets put the scrubber back in
the lung |
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Over pressure
valve of the Counterlung |
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The valve is located in the
middle of the counterlung |
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The rubber has been hardened and
the valve must be restored to work properly. |
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Breathing hoses |
Early
rebreather all have small diameter valves and hoses. This unit
is no exception. Although the unit was used to 33 ft (10mtr) the
work of breathing must have been relative high. Today diving to
10 mtrs on pure oxygen is not common and called very dangerous
due to the partial pressure of oxygen of 2.0 bar! |
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Mask |
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The mask of the B-lung is a
piece of art. It has brass parts made with craftmanship and
machines to very high quality parts. Valves are made extremely
simple so every diver was able to maintain the mask themselves! |
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head straps of rubber and canvas |
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glued |
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inhalation valve and surface
shut-off valve. The diver could shutdown the rebreathercyle by
closing this inhalation valve and breath by using the purge
valve in front of his mask. The factory also recommended to keep
some water in the mask to clean fog inside the mask! |
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the narrow valve opening |
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in closed position, diver on the
surface |
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this is the inhale valve! A very
simple and effective design. (although dangerous, when leaking
CO2 could be rebreathed...) |
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This is the spring operated
exhale valve |
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A valve with rubber seat is
fitted and operated by exhaling against the springpressure |
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exhale valve |
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exhale spring made of red copper
or brass |
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valve itself |
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on this pin the spring is
attached and closed in the chamber |
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complete exhale valve |
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Oxygen
bottle |
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The bottle is aatached with
leader rope |
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the 125 bar connector |
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Original 1944 RegO oxygen valve
and Desco bottle |
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februari 1944 marking! |
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DESCO inscription |
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Metering valve |
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The metering needle valve. |
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Weight
belt |
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the emergency pull-pin was a way
to dump the weight belt |
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So, that was all folks! If you
have any information about the B-lung or other Desco
rebreathers, please send it to jw.bech@quicknet.nl |
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17-02-2013 |
Jan –
My history person has come through!
He says:
That is an old 300 series valve 1/4" MNPT on both ends, on the
hose side it had an adaptor to accept the hose assembly as a
push on, this was actually a bomber high altitude oxygen vest.
The 300 series valves were manufactured by Hoke in Queens, NY by
the Joseph Hoke Valve Company between the years of 1943
to 1949-1950.
There should be some other data on the opposite face of the
valve as well.
I hope this helps.
If you have further questions, please let me know.
Regards,
Sherri
Technical
Support Engineer
CIRCOR
Flow Technologies
Hoke Products
405 Centura Court
Spartanburg, SC 29303
Direct: 864/595-5166
Fax: 864/587-5608
sherri.rice@circor.com
www.hoke.com
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added 19-03-2013 |