Recently on the WK2ammo Forum a forum member posted a good mechanical drawing (shown in both German and English) of the WW1 German 11 mm anti-balloon cartridge with the Lentz incendiary bullet, obtained from the German Federal Archives or Bundesarchiv. The complete drawing (dated 1914) and a computer rendering of a cartridge may be viewed here: ( wk2ammo.com/showthread.php?8 … ntz-Gescho )
Apparently the Lentz bullet works in the following manor: when the fired bullet exits the barrel two conical safety pins are thrown clear of the projectile, thus allowing the striker/firing pin to move upon impact. At impact the striker firing pin hits a primer which fires and ruptures a glass vial of acid. The acid interacts with an incendiary chemical composition causing an incendiary chemical reaction, which in theory would ignite the flammable gas of the enemy balloon.
If anyone can add to this or make corrections please do so.