A pan-tilt camera is arranged to include a camera head, a stationary unit, an intermediate member arranged between the camera head and the stationary unit, a first rotary joint rotatably connecting the camera head to the intermediate member, and a second rotary joint, rotatably connecting the intermediate member to the stationary unit. A formula type, of an identified formula from a spreadsheet, is identified. The invention can be used in environments such as data encryption, reference trimming, manufacturing ID, security ID, and many other applications. In contrast, for fake fireplaces, which require more gas flow compared to real fireplaces, the gas valve may be opened to its maximum level with a half turn of the handle. The digital samples are then operated on by a microprocessor or signal processor to determine energy in a plurality of channels, preferably using a fast Fourier transform. The amount of water in the mixture is at least sufficient to permit extrusion of said reaction mixture.