(1) A mistake or error caused by mental confusion, carelessness, stupidity, or ignorance. (2) A numerical mistake or error caused by mental confusion, carelessness, stupidity, or ignorance. Examples of blunders are: reading a horizontal circle wrong by a whole degree; neglecting to record a whole tape length in a traverse; and reversing the numerals in recording a measurement. It would also apply to the number recorded as the result of observing on the wrong target or from the wrong control point. (3) A large numerical mistake or error caused by mental confusion, carelessness, stupidity, or ignorance. By this definition, a small error would not be a blunder. (4) An error, made by a machine, of the same nature as that defined in (1). For example, an error caused by a poorly working card punch or paper tape punch would be such a blunder.