File:TFrictionPushTubeMkIBLC15pounder.jpg

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TFrictionPushTubeMkIBLC15pounder.jpg (800 × 445 pixels, file size: 59 KB, MIME type: image/jpeg)

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"T" Friction tube, special Push version, Mk I, for British BLC 15 pounder gun.
Introduced to enable the gunlayer to fire the gun in similar manner to a Q.F. gun, without needing to hook a lanyard to the tube for firing :-

  • The tube was inserted into an axial vent in the breech.
  • The breech mechanism incorporated a firing plunger to push the friction bar in the tube.
  • When loaded, the gunlayer activated a firing handle on the layer's guard behind and on the left side of the breech. This activated a firing lever above the breech, which in turn activated the firing plunger below it.
  • When pushed, the friction bar shears the suspending wire, travels forward, the roughened conical part of the bar pierces and fires the detonator.
  • The push bar also carries portions of the composition and grinds it against roughened interior of the head, further ensuring ignition.
  • The flash passes down through the plug in the body, fires the powder in the tube, sending a flash along the radial vent in the "mushroom" and into the chamber and and hence fires the cordite charge.
  • The copper ball is driven upwards by the explosion and seals the head against escape of gas.
  • From 1909 a small escape hole was added to the head to allow gas from exploding cap to escape, and hence prevent the head expanding and jamming in the vent.
Date data correct as at 1 August 1914
Source

Plate LXXV, pages 368-369 in "Treatise on Ammunition" 10th Edition 1915.

Facsimile reprint by Imperial War Museum and Naval & Military Press, 2003
Author War Office, UK
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This is because it is one of the following:

  1. It is a photograph taken prior to 1 June 1957; or
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current13:57, 1 April 2008Thumbnail for version as of 13:57, 1 April 2008800 × 445 (59 KB)Rcbutcher (talk | contribs){{Information |Description="T" Friction tube, special Push version, Mk I, for British BLC 15 pounder gun. <br>Introduced to enable the gunlayer to fire the gun nin similar manner to a Q.F. gun, without needing to hook a lan

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