A frame-setting apparatus that is designed to be used in leveling frame structures having adjacent side-frame members that must be set in a close parallel relationship to their opposite sides, whether they be in a vertical or a horizontal position, wherein the apparatus comprises an elongated level having a plurality of spirit-level units spaced along the length of the level in the usual manner to provide a level reading in both a vertical and a horizontal position, and wherein flat elongated sections of mirrors are interposed between the spirit levels to reflect from one side frame member to the adjacent frame member, the mirrors being provided with a center-leveling line marked longitudinally along the length of each mirror, so as to aid in the alignment of a corresponding frame member when sighted in the mirrors.
Disclosed herein is a level comprising a horizontal component comprising a first terminal end and a second terminal end; a first vertical component comprising an end joined to the first terminal end of the horizontal component, wherein the first vertical component is attachable to a first vertical side of a jamb; and a second vertical component comprising an end joined to the second terminal end of the horizontal component, wherein the second vertical component is attachable to a second vertical side of a jamb; wherein the level squares, levels, and plumbs the jamb. Further disclosed herein is an assembly comprising two levels disposed on a jamb such that the sides of the jamb are held rigid and secure, and the angles of the jamb are held at a constant angle to increase the ease of installation of the jamb.
