This pinball machine actually is one which is pretty rare, not much can be found about it.|
What I could find is that it was manufactured in Berlin, by Paul Bohlmann. A machine more famous is the 1937 Paul Bohlmann Pinball machine, the Blink-Feuer. This has some automatic action on the playing field. However, the points must be counted by yourself again....
The machine is in fact electro-mechanical (one of the early ones), has automatic scoring, and is one of the first which has the typical round bumpers, which are so essential for many Pinball machines after. However, the bumpers on the Zentri Bomber are not active, they only give you a score. Scoring can be done from all sides, which was very ew at the time, when with most pinball machines one had to count the scores oneself.
On the right one such bumper is shown (I had to clean them all, to make sure that the machine worked properly). It one cast-aluminium or Zamac piece, with two very thin steel discs, one mounted a few mm above the other. The top one is directly fitted to the cast metal bumper, the bottom one is isolated from this. The bottom one is connected (just by contact only) to one wire, the other wire is wound around the bottom end of the bumper, which is screwed in place with a nut. It works quite well, and with some combination of luck and skill, one can even bounce the ball between two bumpers several times, or between a bumper and the steel spring which marks the sides of the playing field.
Also early is the fact that it has a "Tilt" contact, just a connected pendulum in fact, which switches the machine off (until you insert another coin).
Above left, the side of the cabinet, with the lever to lift the next ball (my machine has currently 3, though it should be 5 balls) to the plunger. In the middle the outside of the coin mechanism, 10 Ore indicating that this machine was sold in Denmark. On the right the underside of the playing field, with the counter at the top, and below that the wiring to all the bumpers.|
How this works is easy to see in the photo on the right. The top hole makes the ball fall into the right side, which goes directly to the ball-lift. The game with one ball of course ends when it falls down the bottom hole, this leads to the left side, which causes the ball to roll to the left side of the rails, where it is stopped by a pin, which can only be released by inserting a coin for the next game. However, with some gentle bumps agains the cabinet, it is possible to bounce the ball from the bottom spring, up (and even over) the bottom blue bumper, allowing to make a lot of additional points!
On the bottom of the left photo above, there are two round pieces of 84 year old paper, with instructions and the number of balls to be played. Completely faded, in Danish, and in the typical German typeface. However, I am not going to replace these with new ones!!
On the right, the counter "clock". The red arrow gives your score, so you can see that my last score was 50,000 points (I did already reach 100,000 on several occasions). In fact, the clock has to do only 70 moves to reach 100,000 points.
At each 10,000 points you make, you get a bonus of 5,000! A very strange way of counting.... Thus, after 9,000 points, you go to 15,000. After 24,000 points, you go to 30,000 and so on...
The photo below shows another very intelligent feature of this pinball machine. Shown is the ball-lift, and the end of the rod which is operated to release the balls and zero the counter. When this is operated, the ball-lift is actually blocked, and can not be operated! Thus, you get rid of those annoying boys, where one keeps pulling the lever to release the balls, and the other can play for free as long as he likes! (without points of course, but who cares)