The MSA OXYGEN BREATING APPARATUS MODEL B

photographs and text by Jan Willem Bech

first published on http://www.therebreathersite.nl
date: 20-01-2010


This rebreather comes without cylinder since oxygen is generated in the scrubber!

The scrubber contains a very reactive substance capable of scrubbing CO2 en generating oxygen.

The mask has a Oral membrane, allowing the wearer to communicate while unit is applied

Wanted: manual N5ss

The extremely heavy build mechanism to hold the chemical cartridge

When lever is opened the scrubber pops out.

unit was build in 1945

30 minutes cartridge

The angled side of the connection fits perfectly in de holder

The black push mechanism is spring loaded and holds the cannister in place
 

This pipe has a one way valve to force the gas in one direction

The unit can be disassembled with the aid of this one tool
 

Connections seal woth rubber (?) flat rings
 

HERE YOU SEE THE ONE WAY VALVE, MADE OF MICA

The mushroom valve can be closed with the springlock mechanism
 

The inside of the mouth/nose mask is covered with leather

Counterlung is made of high quality thick rubber
 
 

Antifog paste
 

Antifog paste for goggles

Mask pocket

This fire resistant pocket was designed to put the mask in?  Material might contain asbestos.....

UNIT COMES WITH GOGGLES MADE BY THE OLYMPIC COMPANY!
 

Strap and mask made in one piece
 
 
 
 
 
published 20-01-2010
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Email: jw.bech@quicknet.nl

The MSA oxygen rebreathing apparatus model B is a oxygen rebreather equipped with chemical superoxide canister. The canister both scrubs the CO2 and produces the necessary oxygen. This half hour unit was mainly used in the US marines. The particular unit was build in WWII possible in 1945.


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