WITH THIS UNIT, THE DRUM DOES NOT SHIFT THE FIRST TIME IT PASSES 6 O'CLOCK. THE FIRST COLUMN THEREFORE RECORDS UP TO 24 HOURS OF PATROL. IT WILL SHIFT THE SECOND TIME THE DRUM REACHES THE 6 O'CLOCK POSITION ,AND 12 HOURS LATER IT WILL SHIFT AGAIN GIVING 3 COLUMS OF RECORDS. IN THE EARLY PART OF THE 20TH CENTURY, SUPERVISORS PROBABLY DID NOT END THEIR WORK DAY BEFORE 6 PM.
