Public domain photos

The image shows a black and white drawing of a piece of wood with a ruler on it, which is a scale used to measure the length of a beam. The scale is composed of a series of points connected by a line, and the ruler is used to accurately measure the angle of the beam.

The image shows a black and white drawing of a piece of wood with a ruler on it, which is a scale used to measure the length of a beam. The scale is composed of a series of points connected by a line, and the ruler is used to accurately measure the angle of the beam.Open in library