A blast pen was a specially-constructed E-shaped double bay at British World War 2 fighter stations, being either 150feet or 190feet wide and 80feet front_to_back, accommodating aircraft for safe_keeping against bomb blasts and splinters during enemy air_attacks.
Although the pens were open to the sky the projecting sidewalls preserved the aircraft from lateral damage, with 12_inch thick, 9_feet high concrete centres, and banked_up earth on either side, forming a roughly triangular section 18_feet wide at their base. The longer spine section behind the parking areas usually encloses a narrow corridor for aircrew and servicing personnel to use as an air raid shelters.
Examples may still be seen at the present Kenley Aerodrome and at North Weald aerodrome in Essex close to "The Squadron" bar, some pens have had their second bay removed over the years, thus becoming U-shaped.
A blastpen was a specially-constructed E-shaped double bay at British RAF World War 2 fighter stations, being either 150 feet or 190 feet wide and 80 feet front-to-back, accommodating aircraft for safe-keeping against bomb blasts and splinters during enemy air-attacks.
Although the pens were open to the sky the projecting sidewalls preserved the aircraft from lateral damage, with 12-inch thick, 9-feet high concrete centres, and banked-up earth on either side, forming a roughly triangular section 18-feet wide at their base.
Examples may still be seen at the present Kenley Aerodrome and at North Weald aerodrome in Essex close to "The Squadron" bar, some pens have had their second bay removed over the years, thus becoming U-shaped.
The blast from a tear gas weapon, such as a tear gas pen, has three components: the propellant, the wadding, and the chemical agent.
The third component of the blast is the tear gas itself, and in most pens the chemical agent is in the form of a fine powder.
Various features of the tear gas weapon, such as the blast force, the propellant charge, the wadding, and age of the cartridge, in addition to the chemical agent itself, should be considered in evaluating such eyes either clinically or microscopically.
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