Typos: (I've numbered paragraphs by line break. Some line breaks seem to be missing.)

paragraph 2: asure -> assure, controll -> control
paragraph 3: that the using -> that using
paragraph 4: You have a space and five periods here where I guess you want an ellipsis? (No space, four periods if it ends a sentence.)
paragraph 11: Don't follow a question mark with an ellipsis.
paragraph 17: half sphere -> half-sphere
paragraphs 19 and 22: You have "centimeters" (American spelling) and "manoeuvre" (British). This should be consistent - either "centimeters" and "maneuver" or "centimetres" and "manoeuvre."
paragraph 22: and as the picture -> "and the picture" or "and as it did the picture"
paragraph 24: light grey colored -> light-grey-colored
paragraph 26: At his feed -> As his feed