章 568: The Dry Distillation Tower

"Um..." Sylvie carefully examined the shell and checked it against Roland's design for a long time. She pointed at the detonator and said, "It seems this bronze tube is not aligned with the nail on the top."

"How about the spring?" asked Anna. "Is it still stuck at both sides of the iron pan?"

"One has gone bad."

"To the left or the right?"

Anna asked about every detail, and then wrote all the problems down in a notebook.

After collecting the reasons leading to the failure, they began the next round of test firing, where Summer's playback ability could be used four times. Thus the efficiency of the improvement had become unprecedentedly high.

Unfortunately, the next two rounds of test shooting failed again. Roland had to declare that the testing would continue the next day.