def append_from_json(self, json_string):
        """
        Creates a ``measurement.Measurement`` object from the supplied JSON string
        and then appends it to the buffer
        :param json_string: the JSON formatted string

        """
        a_dict = json.loads(json_string)
        self.append_from_dict(a_dict)
Creates a ``measurement.Measurement`` object from the supplied JSON string
        and then appends it to the buffer
        :param json_string: the JSON formatted string