I meant to say the screw holes would be used to admit hydrogen into the cells, or evacuate them. Maybe they would be used to admit nitrogen to shut the thing down.
100 individual hydrogen pressure hoses running to 100 cylinders would be an engineering headache but I suppose something can be worked out with a common hose. This would resemble the hoses used in air brakes. I think you need only one hole per cell, and the other connection can be made with built-in insulated electrical connections, where you attach a wire to the outside, and another wire or thermocouple to the inside. That reduces the need for holes, so it reduces leaks. The lid has to be bolted down airtight, as it is with an internal combustion engine. To resort to ASCII art, a cross section of one row of cells and horizontal cooling fluid holes seen from the side would look sorta like this, where "U" represents the 10 cylindrical (or square) cells in one row of the the engine block, and "o" represents the horizontal cooling-fluid hole drilled all the way through: U o U o U o U o U o U o U o U o U o U (Not to scale -- or maybe they will make them this small eventually.) The "o" holes go through the wall around each cell. - Jed
