The sketch is quite clear but you must explain a little more on the bigger wheels.
1) It is clear as there are arrows in the diagram to show how it works, as in which way the mechanisms would work.2) Important labels cannot be seen clearly to tell us how the products in more detail.
1) The sketch is clear as it is drawn in big side and there are arrows to show how it works. The table is also a good idea.2) However, for the table, maybe he can draw it in a more detailed form and explain each parts.
Both sketches are clear but labels are not clear, must write bigger.
The sketch is clear and understandable though the words are a little hard to read.