Patent ID: 6968627

Claim:
A slope determination system, for determining a slope of an element, comprising in combination: a) calibrated indicia means for providing a calibrated indication of slope; b) multiple-indicator means for providing at least two simultaneous indications with respect to said calibrated indicia means; c) gravity-assisted positioner means for maintaining, essentially by gravity, the position of said multiple-indicator means with respect to vertical; d) abutting means for abutting the element having the slope to be determined; and e) geometry-control means for controlling the geometry of said calibrated indicia means relative to said abutting means; f) wherein said geometry-control means comprises protective cover means for protectively covering said multiple-indicator means; g) wherein said protective cover means comprises visual access mean for permitting visual access to said multiple-indicator means; h) wherein said protective cover means comprises said calibrated indicia means; i) wherein said calibrated indicia means designates at least one slope defined by a measure of vertical rise over a measure of horizontal run; and j) wherein, by using said abutting means to abut the element, the slope of the element may be determined by observing at least one of the at least two simultaneous indications of said multiple-indicator means.