JUMPING SHIP

hi mY gREAT GRANDFATHER SAILED IN A WHEAT SHIP TO AUSTRALIA BETWEEN 1873-1880. HIS NAME WAS LAURITS MONSEN AND HE IS IN THE 1865 CENSUS FROM FARSUND. HOWEVER HE CALLED HIMSELF LAURITS ANDERSEN IN AUSTRALIA AND MARRIED MY GREAT GREAT GRANDMOTHER IN 1881. WE HAVE NO RECORDS OTHERWISE. I AM TRYING TO FIND WHICH SHIP HE CREWED ON AND WHEN HE JUMPED SHIP, POSSIBLY IN NEWCASTLE. I HAVE BEEN TOLD HE WAS AN ENGINEER. I AM ALSO TRYING TO FIND THE REST OF HIS FAMILY OR DESCENDANTS. JACKIE