(1) A procedure for restoring a lost corner by reference to two known corners (both east and west or north and south of the lost corner) and an alinement in the transverse direction, by using the rule that the measured distance from a known corner to the restored corner shall have the same ratio to the corresponding, recorded distance (to the original corner) as the total, measured distance between known corners has to the distance given in the original record, and that the alinement be preserved. (2) A method of proportioning measurements, in the restoration of a lost corner whose location is determined with respect to alinement in one direction, by distributing the excess or deficiency in such a way that the amount given to each interval shall have the same proportion to the whole difference as the recorded length of the interval bears to the whole distance.