A diesel-powered, high-pressure air compressor is rated at 1,100 cfm and has a pressure range from 150 to 350 psi. The self-contained, 100% oil-free compressor has a "save all" base that eliminates fuel spills and oil leaks, making it one of the most environmentally friendly thehistoryofthecarheater high-pressure units available. The diesel-driven engine stays well within the boundaries of the EPA and CARB emissions regulations. A complete line of accessories for the compressor is also available, ranging from aftercoolers to --40[degrees]F desiccant dryers and filters. Air compressor manufacturer, P.K. Lindsay, Deerfield, N.H., has been sold to American Eagle Accessories Group, Garner, la., a division of Stellar Industries Inc. The Lindsay air compressors are sold under the Lindsay and E.L. Smith brand names. All Lindsay compressor assets have been moved to American Eagle''s Garner plant and resumed full production. American Eagle is also a distributor of various truck-related accessories. According to the company, the FRL series of compressed air filters, regulators, lubricators, and manual control valves provides efficient moisture and contaminant removal, accurate pressure regulation, thehistoryofthecarheater and precision lubrication for all air-operated equipment applications. All of the components in the series are available individually or in combination units. According to the company, its compressed-air productivity tools cut energy costs by as much as 70%, while reducing the compressor burden and shop noise levels. A 24-pg application manual shows bow these accessories provide solutions to spot chilling (to -40[degrees]F), dry machining, blow-off, control cooling, air conveying, static, liquid transfer, and spill pick-up. The products meet OSHA noise and dead-end pressure requirements. Welding shops require many types of equipment, including power supplies, guns, torches, wire feeders, flux-handling devices, and accessories such as cables and ground clamps, as well as consumables-filler metals, fluxes, and shielding gases. For brazing, shops employ furnaces and custom-built fixtures.

In the summer of 1999, we had used the bottom two layers of 3T to provide autonomous control for a single subsystem--a second-generation biological water processor--during a 450-day, 24-hour-a-day, 7-day-a week test. Then in January 2000, the Advanced Water Research Group received ALS funding for the year-long IWRS test, involving four advanced water-recovery subsystems (Bonasso 2001) (see Advanced Water Recovery System sidebar).BuildupUsing 3T allowed us to develop the control for the IWRS in a modular fashion in two ways. First, moving from bottom to top (figure 4), each layer has its own data structures, timing constraints, and development tools that allow for parallel development of the software. Thus, we were able to develop skills sets based on the evolving hardware specifications and simultaneously develop the sequencer procedures. Early on, as the water research team developed the design for each subsystem, one part of the 3T team wrote the sequencer procedures for each subsystem in the RAPS language (which, in turn, is written in Lisp) (1) using virtual skills, that is, Lisp skills connected to a Lisp simulation of the expected hardware. A virtual simulation of, say, the reverse-osmosis subsystem could then be shown on a laptop to the WRS engineers and the control design refined in an iterative process even before the actual hardware was available. The primary result of this process was a set of skill specifications for each subsystem (figure 5).

TALK TO GOLFERS about their on-course disputes and one word more than any other peppers the conversation: Gimme."I''m at Old Head in Ireland with my good friend Ryan," says Alan. "It''s the last day of the trip, it''s a perfect morning and we''re having a match. On the front nine somewhere, on a par 3, Ryan is messing up, and it continues on the green. He misses his second putt and has a two-footer left for 5 or something and just rakes thehistoryofthecarheater it in. ''That''s enough,'' he says. I''m thinking, Well, OK, but I''m not doing too well, either. Sure enough, I miss my putt and we halve the hole. I''m steamed. ''C''mon, mine was good,'' he says. So I go, ''Yeah, OK,'' to be nice, and then skid my drive into the deep, deep rough. He stripes it down the middle. We don''t talk for the rest of the day."

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