Atom averaged 71.3 percent, but periodically dropped to around 55 percent utilization.

He periodically drops by the shops on his beat, to check out the security, and the sales.

Members of the Hunter family said Terri Willis periodically dropped by to see her children and get money, food or clothes.

The response periodically drops to a local minimum and rises to a local maximum.

He periodically drops in and spreads chaos.

The sword of Damocles always hangs over the team and periodically drops as it did in the 1950's when a very talented rookie lost his eye.

Normally of magnitude 6, its brightness periodically drops as low as magnitude 15 and then slowly increases over the next several months.

On December 19, 2012, cold weather caused ice to accumulate on the supporting cables, periodically dropping to the car-deck below.

Elsewhere in the Pacific these lone intruders would remain overhead for hours on end, periodically dropping a bomb to make sure no one got to sleep.

Nevertheless the water level would periodically drop too low to run the mill, and it went out of business, later burning down in 1891.