Patent ID: 8898917

Claim:
A multi-purpose measurement apparatus comprising a combination spirit level and a protractor, for precise measurement of orientation and angle of a material, the apparatus comprising: a. a frame [ 11 ] for resting against the material, the bottom portion of the frame [ 11 ] being a flat and straight surface, said frame [ 11 ] comprising a strip of ruler markings [ 13 ] disposed at the bottom portion of the face of the frame [ 11 ] and the bottom portion of the rear of the frame [ 11 ], said frame [ 11 ] further comprising a slot at a substantially centermost position of the frame [ 11 ]; b. a clear, global housing [ 12 ], forming front and rear windows on the frame [ 11 ] and disposed in the slot at the substantially centermost position of the frame [ 11 ], the housing [ 12 ] filled with an oil composition [ 31 ], the housing [ 12 ] further comprising a set of angular graduation [ 14 ] labeled on the front and rear of the housing [ 12 ], the housing [ 12 ] further comprising: i. an angle indicator system [ 15 ] disposed within the housing [ 12 ] which signals the angle of the frame [ 11 ] against the material, the angle indicator system [ 15 ] further comprising: 1. a bearing [ 35 ], the bearing having a first end and a second end, the bearing [ 35 ] fixedly attached to opposing inner ends of the front and rear windows of the frame [ 11 ], the first and second ends of the bearing [ 35 ] aligned with the face and rear of the frame [ 11 ], the bearing [ 35 ] disposed perpendicular to the top and bottom of the housing [ 12 ] and the frame; 2. a bearing frame comprising a pair of rigid radial arrows [ 34 ], the arrows [ 34 ] facing the same direction and disposed in a parallel position where proximal ends of the arrows connect said arrows to the bearing [ 35 ] at opposite ends of the first and second ends of the bearing [ 35 ], wherein the bearing frame is rotatable about an axis of rotation created by the bearing [ 35 ]; and 3. a flat weight [ 33 ], suspended between the pair of arrows [ 34 ] at a distal end of the arrows [ 34 ] and of the bearing frame, wherein the angle indicator system [ 15 ] rotates about the bearing [ 35 ], and the arrows [ 34 ] signal an angle corresponding to the physical position of the frame [ 11 ] against the material and wherein the frame [ 11 ] also functions as a ruler or protractor.