What is the purpose of a Clamp in construction?

A clamp in the context of construction refers to a specific device used in the process of kiln firing materials such as bricks or limestone. When bricks or limestone are arranged in a certain configuration inside a kiln for burning, this setup is referred to as a "clamp." The purpose of this arrangement is to facilitate the efficient burning process within the kiln, allowing for proper heat distribution and achieving the necessary chemical changes in the materials. The clamp configuration ensures that the raw materials reach the required temperatures for optimal hardening and durability.

The other options do not accurately describe the function of a clamp in construction. A device for measuring angles pertains to tools like protractors or levels, which are unrelated to the burning process. A tool for lifting heavy stones would be more associated with lifting devices or machinery like cranes, rather than clamps. Lastly, a type of mortar used in masonry refers to materials that bind stones or bricks together, which is distinctly different from the function of a clamp in the burning of materials.