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Bevel, is a and tool consisting of two rules that are hinged together so you can draw or measure angles of any size. A sliding T bevel is an adjustable gauge for setting and transferring angles. The handle is usually made of wood or plastic and is connected to a metal blade with a thumbscrew or wing nut.

Bevel Square

Bevel, is a and tool consisting of two rules that are hinged together so you can draw or measure angles…

The goniometer is an instrument for measuring the angles of crystals. Nicolaus Stena in 1669 determined the interfacial angles of quartz crystals by cutting sections perpendicular to the edges, he plane angles of the sections being then the angles between faces which are perpendicular to the sections.

Horizontal-Circle Goniometer

The goniometer is an instrument for measuring the angles of crystals. Nicolaus Stena in 1669 determined…

The goniometer is an instrument for measuring the angles of crystals. Nicolaus Stena in 1669 determined the interfacial angles of quartz crystals by cutting sections perpendicular to the edges, he plane angles of the sections being then the angles between faces which are perpendicular to the sections.

Vertical Circle Goniometer

The goniometer is an instrument for measuring the angles of crystals. Nicolaus Stena in 1669 determined…

The Universal Drafting Machine is used in a large drafting room. It combines the functions of T-square, triangle, scale, and protractor to save time in machine drawing and civil engineering work.

Universal Drafting Machine

The Universal Drafting Machine is used in a large drafting room. It combines the functions of T-square,…

A protractor to measure angles and degrees.

Protractor

A protractor to measure angles and degrees.

"The outer edge is a semicircle, with center at 0, and is divided into 360 parts. Each division is one-half of one degree, and, for convenience, the degrees are numbered from 0 to 180 from both A and B." — Hallock, 1905

Protractor

"The outer edge is a semicircle, with center at 0, and is divided into 360 parts. Each division is one-half…

Sometimes built into a compass, this instrument allows you to determine and measure angles in degrees and is most useful when projecting magnetic lines across your map.

Bevel Protractor

Sometimes built into a compass, this instrument allows you to determine and measure angles in degrees…

A semicircular instrument for measuring and constructing angles.

Drafting Protractor

A semicircular instrument for measuring and constructing angles.

A 6 inches diameter protractor to measure angles to half degrees, made of brass or German silver. They are useful in map and topographical work.

Semicircular Protractor

A 6 inches diameter protractor to measure angles to half degrees, made of brass or German silver. They…