Copyright Goodheart-Willcox Co., Inc. 34 Section 2 Introduction to Masonry preparation for grading, construction of batter board and stake layout, and concrete leveling. Rotary laser levels can also be used to shoot lines when construct- ing forms for footings and walls. A rotary laser produces a 360° laser beam that rotates around the perimeter of the unit. Models produce a laser beam in either red or green light. Some models have fea- tures of self-leveling and a remote control to turn the unit on and off. The units operate on single or multiple batteries. Some models use a removable rechargeable power pack that can vary from 12 to 18 volts. 3.1.9 Chisels Masons use various chisels for different kinds of materi- als. A brick set is used to cut brick to exact dimensions. See Figure 3‑22A. Mason’s chisels are designed to cut brick, block, and stone. A mason’s chisel is available in a number of sizes, shapes, and weights. See Figure 3‑22B. There are a variety of mason’s chisel types designed for scoring or splitting stone. See Figure 3‑22C. Safety Note Always wear eye protection when using a laser level. Most laser units include eye protection in the kit. Always read the manufacturer’s instructions before operating a laser. Refer to the manufacturer’s instruction manual to determine necessary eye protection for others in the area. All chisels must be kept sharp and straight if they are to work properly. Burrs must be removed from the top end to prevent injury during use. Quality chisels are made from tempered tool steel. They are very hard and must be sharpened by grinding. Johnson Level and Tool Manufacturing Company, Inc. Figure 3‑21. This rotary laser level was set up on a construction site to aid in positioning footing forms for a residential home. The laser level was used to ensure that the top of the footings are level and at a specific grade elevation. A Marshalltown Company Marshalltown Company Stanley Goldblatt Figure 3‑22. Types of chisels. A—A brick set is a type of chisel used to cut brick to specified length. The chisel is 4″ wide. B—A mason’s chisel is used for cutting stone and concrete block. This chisel is 1 3/4″ wide. C— Stone mason’s chisels are used to split stone. B C