To construct a gas mask using the specific method described in the provided reference, the core components involve a can acting as a filter housing, specific chemicals to purify the air, and materials to assemble and seal the device, along with a harness to hold it securely.
Building the Filter Canister
The central part of this gas mask design is a repurposed can that serves as the filter.
- Prepare the Can: The ends of the can are removed. This creates openings for air to enter and exit.
- Add Wire Netting: The removed ends are then replaced with the wire net. This likely acts as a screen to hold the filtering materials in place while allowing air flow.
Preparing the Filtering Chemicals
The effectiveness of the mask relies on the chemical mixture inside the filter.
- Chemical Mix: The specified chemicals are two parts activated charcoal and one part soda lime. This combination is commonly used to absorb gases and vapors.
- Wrapping: These chemicals are placed inside the can, but first, they are wrapped in the handkerchiefs. This likely prevents fine chemical dust from being inhaled and keeps the mixture contained.
Assembly and Sealing
Proper assembly and sealing are crucial to ensure that air passes only through the filter.
- Insert Chemicals: The wrapped chemicals are put inside the can.
- Seal Openings: All openings in the cap are hermetically sealed with adhesive tape. This step is vital to prevent unfiltered air from bypassing the chemical filter.
Attaching the Harness
A secure fit ensures the mask stays in place and forms a seal against the face (though the reference doesn't detail the facepiece itself, only the filter canister and harness).
- Add Harness: An elastic-ribbon harness holds the mask on tight. This adjustable strap system allows the user to secure the filter canister to their face or a separate facepiece assembly.
Materials Required
Based on the method described, the materials needed are:
- A can (with ends removed)
- Wire net (to replace the can ends)
- Activated charcoal (two parts)
- Soda lime (one part)
- Handkerchiefs (for wrapping chemicals)
- Adhesive tape (for hermetically sealing openings)
- Elastic ribbon (for the harness)
This method describes the construction of a basic gas mask filter and harness assembly, focusing on creating a sealed environment for the filtering chemicals within a can.
