rearwardly from a direction correction head at a foremost tip of the lead pipe configuration that would interfere with axially directed incident light that is to be detected by a transit at the rear of the configuration this detection being used to determine if lead pipe configuration direction error is present and if so that it be corrected the lead pipes also can have a high light absorption coating such as a resin on the inner lead pipe surfaces to absorb reflected light that otherwise could interfere with proper light detection application_number US 41914995 A description the present invention relates to a lead pipe configuration for a propulsion type underground piping device used for lay down of e g fresh water and sewer line pipe runs such a device and the method for laying underground pipes using this device will first be described with reference to fig1 and 2 as shown in fig1 an underground piping device 1 comprises a base 2 rails 3 4 arranged parallel to and above base 2 slide sections 5 6 moving back and forth along rails 3 4 and a propulsion machine 7 supported by slide sections 5 6 an oil hydraulic motor 8 is arranged on propulsion machine 7 and drives a drive shaft positioned roughly at the center of propulsion machine 7 oil hydraulic cylinders 9 10 are arranged internally within slide sections 5 6 and can move back and forth along rails 3 4 along with propulsion machine 7 the rear end of a lead pipe 11 is connected to the drive shaft of propulsion machine 7 the.