The accelerator's central control room requires no fewer than seven operators at a time, working in round-the-clock shifts.

Other postal workers, he said, "have three round-the-clock shifts in the office, and we only have one."

This approach to information also helps close the communications gaps that can develop in a plant with round-the-clock shifts.

During the next seven days, round-the-clock shifts of students will add logs to maintain the proper firing temperature.

This year, so far, there have been 70 days of round-the-clock shifts.

Moreover, one military official said, more than 80 spotters are needed on the ground to pinpoint targets during round-the-clock shifts.

City sanitation workers, most of whom have worked in round-the-clock shifts for nine days, were out again yesterday.

We're working round-the-clock shifts, and we've maintained continuous on-site visual records.

Some 800 volunteers act as docents, medical technicians and rescuers on round-the-clock shifts.

A crew of 600 has spent the last week assembling all this, working round-the-clock shifts.