A beam compass is a compass with a beam and sliding sockets or cursors for drawing and dividing circles larger than those made by a regular pair of compasses. The instrument can be as a whole, or made on the spot with individual sockets (called trammel points) and any suitable beam.

Trammels or trammel points are the sockets or cursors that, together with the beam, make up a beam compass. Their relatively small size makes them easy to store or transport. They consist of two separate metal pieces (approx. 2.5" X 5" X 1/2") that are usually connected by a piece of wood, The wood timber is not included in the purchase of the trammel points. It can be ripped on a table saw. A lumber yard or woodworking store should have a piece readily available to fit the opening also ,metal, or pipe. They work like a scratch awl.

As for any compass, there are two uses.

The beam compass is used to scribe a circle. The radius can be adjusted by sliding the metal across the wood (beam) and locking it by turning a knob at the desired location. The threaded machine rod is similar to the bolt. The only limitation is the rigidity of the wood being used. Longer pieces tend to get floppier depending on the species of wood used. Metal can be used as an alternative but also has length limitations. Trammel points score a precise cut out line with the sharp point of the rod. When the circular knob is turned, it micro adjusts the radius of the circle. The spring locks the mechanism at the precise desired location. Turning clockwise decreases the radius while turning counterclockwise increases the radius slightly.

DJ Micro (born Michael Marsicano) is an American trance DJ and producer.

DJ Micro began on the East Coast, where in 1991 he helped form the Caffeine Records collective in Deer Park, NY. Caffeine began as a weekly club night, and started building a brand. Micro spun at many of Caffeine's parties, specializing in acid breaks. In 1994 he joined with Vicious Vic under the moniker Progression. They obtained massive popularity in the international dance scene after the release of their debut single Reach Further. They were soon commissioned to remix artists such as Paradise 3001, Joe T. Vanelli, Masters at Work, and even the X Files theme.

He recorded two mix albums for Roadrunner in the late '90s, Coast to Coast (1997) and Caffeine: The Natural Stimulant (1998). He later hooked up with Moonshine in 1998. Micro's first release for Moonshine, Micro-Tech Mix (1998), would be followed by a large succession of mix albums, usually one released annually.

DJ Micro aggressively toured the country recording mix albums for Moonshine Music to boost his popularity. Micro slightly changed his style with each album and moved toward trance while maintaining his breakbeat roots. By the end of the '90s, he had become one of the most popular DJs on the East Coast, considered in the same class of superstar DJs as Frankie Bones and Scott Henry^{[citation needed]}. Like them, Micro toured often, particularly on the East Coast.