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- PH_helmet abstract "The P helmet, PH helmet and PHG helmet were early types of gas mask issued by the British Army in the First World War, to protect troops against chlorine, phosgene and tear gases. Rather than having a separate filter for removing the toxic chemicals, they consisted of a gas-permeable hood worn over the head which was treated with chemicals.The P (or Phenate) Helmet, officially called the Tube Helmet, appeared in July 1915, replacing the simpler Hypo Helmet. It featured two mica eyepieces instead of the single visor of its predecessor, and added an exhaust valve fed from a metal tube which the wearer held in his mouth. The exhaust valve was needed because a double layer of flannel – one treated and one not – was needed because the solution attacked the fabric.It had flannel layers of cloth-dipped in sodium phenolate and glycerin and protected against chlorine and phosgene, but not against tear gas. Around 9 million were made.The PH Helmet (Phenate Hexamine) replaced it in October 1915, and added hexamethylene tetramine, which greatly improved protection against phosgene and added protection against hydrocyanic acid. Around 14 million were made and it remained in service until the end of the war by which time it was relegated to second line use.The PHG Helmet appeared in January 1916 and was similar to the PH Helmet but had a facepiece made of rubber sponge to add protection against tear gas. Around one and a half million were produced in 1916-1917.It was finally superseded by the Small Box Respirator in February 1916, which was much more satisfactory against high concentrationsof phosgene or lachrymators.".
- PH_helmet thumbnail Vickers_machine_gun_crew_with_gas_masks.jpg?width=300.
- PH_helmet wikiPageExternalLink uk.htm.
- PH_helmet wikiPageID "2491779".
- PH_helmet wikiPageRevisionID "544099530".
- PH_helmet hasPhotoCollection PH_helmet.
- PH_helmet subject Category:Chemical_warfare.
- PH_helmet subject Category:Gas_masks.
- PH_helmet subject Category:World_War_I_military_equipment_of_the_United_Kingdom.
- PH_helmet type Artifact100021939.
- PH_helmet type Attire102756098.
- PH_helmet type Clothing103051540.
- PH_helmet type Commodity103076708.
- PH_helmet type ConsumerGoods103093574.
- PH_helmet type Covering103122748.
- PH_helmet type Disguise103206718.
- PH_helmet type GasMasks.
- PH_helmet type Mask103724870.
- PH_helmet type Object100002684.
- PH_helmet type PhysicalEntity100001930.
- PH_helmet type Whole100003553.
- PH_helmet comment "The P helmet, PH helmet and PHG helmet were early types of gas mask issued by the British Army in the First World War, to protect troops against chlorine, phosgene and tear gases. Rather than having a separate filter for removing the toxic chemicals, they consisted of a gas-permeable hood worn over the head which was treated with chemicals.The P (or Phenate) Helmet, officially called the Tube Helmet, appeared in July 1915, replacing the simpler Hypo Helmet.".
- PH_helmet label "PH helmet".
- PH_helmet sameAs m.07hmj_.
- PH_helmet sameAs Q7119280.
- PH_helmet sameAs Q7119280.
- PH_helmet sameAs PH_helmet.
- PH_helmet wasDerivedFrom PH_helmet?oldid=544099530.
- PH_helmet depiction Vickers_machine_gun_crew_with_gas_masks.jpg.
- PH_helmet isPrimaryTopicOf PH_helmet.