"We estimated that we could make one of four cylinders with 4 inch bore and 4 inch stroke, weighing not over two hundred pounds, including all accessories"

This quote by Orville Wright is referring to the development of the very first effective plane engine. He is estimating that they might make a cylinder with a 4 inch bore and 4 inch stroke, which would be used in the engine, and that it would weigh no more than 200 pounds. This would be a significant achievement, as the weight of the engine would be a significant factor in the success of the airplane. The cylinder would need to be strong enough to hold up against the forces of the engine, while also being light adequate to not weigh down the airplane. This quote reveals the ambition and decision of the Wright brothers to create an effective airplane engine, and their confidence in their ability to do so. It also shows their understanding of the significance of weight in the design of the engine, and their dedication to producing a light-weight yet powerful engine.