Making Jackhammer

While chatting they soon came to the Quarry. Looking at the place that was filled with big boulders, John's eyes brightened.

He looked at Zale and said," You shoot one of the boulders and see if the bullet can penetrate those rocks."

Zale immediately took action and fired several shots in a row. The boulders were chipped off and sharp rocks fell from them.

Seeing this John was a little disappointed. Then he remembered that he could make a Jackhammer. So he got down and said," Zale you scout this place and tell me how big it is. Are there any other Rocky mountains like this or are there any other types of rocks present in this region?"

Zale gave a salute and said," Okay Lord John."

He drove away while David from the side couldn't stop his curiosity and asked," Lord John, what are you going to do with these rocks?"

John replied," Mr. David I will reply to your answer later. I need to concentrate to make something."

Saying so he closed his eyes and imagined how the jackhammer worked. He