S-mine dischargers (Minenabwurfvorrichtung) were added to the Tiger to fend off infantry attacks. At first the launchers for these mines were not available, so starting in December 1942 all new Tigers were fitted with the welded mounting points. The actual launchers became available in January 1943.
The Bovington vehicle (number 250122) was one of those shipped from the factory with only the mounting points. This drawing gives the basic dimensions of a mounting point in millimeters. Lengths of 10mm steel strip are solidly welded to the hull, and a hole is drilled for the electric lead.
The forward mounting points were angled at 45 degrees to the hull side. This shows the left-hand one and gives its approximate distance from the front hull plate (at the same level).
There was one mounting point at the middle left of the vehicle. It was unusual in that its connnecting wire emerging from beside it rather than behind it, probably to dodge the ammunition stowage underneath.
At the rear corners of the hull there was no room to put the mounting strips on top, because the hinged air outlet gratings occupied the entire surface at the corner. Therefore, two protruding arms were attached at each rear corner, corresponding to the two welded strips at the other positions.
Here is a view of the left rear corner from above, showing the two arms without the launcher fitted. These arms, overhanging the hull of the tank, were vulnerable to damage. Accordingly, the arm on the side wall could be unbolted for its own protection.
When the side arm was removed, a short vertical strip of metal remained welded on the side wall, as shown here.
The arm on the rear wall was welded permanently in place. These photos show two examples, and the diagram gives the dimensions of this arm.
At the inner end of the welded rear arm there was a small steel cubic mount with a threaded hole. This was used for storage of the dismounted side arm, which could be fixed in place with one of its own bolts. This feature was apparently rarely used, because photos of the side arm stored on this mount are rare. Here are details from wartime photos of two Tigers. The side arm, stored at (B), and its mount on the side wall (A), are indicated.
The trigger wire for the rear S-mines ran along the inside top hull walls. This photo, with the ventilation grille open, shows the path of the wire and how it exited at the corner. Presumably it is placed a short distance down from the corner so that the ventilation grille will not crush it.