CLOCK, Interval Timer—This clock may be used for various timing purposes in the laboratory. It may be set for any interval from a quarter of a minute up to two hours. It is started by moving the lever at the side, and stops when the alarm rings. The movement is well made and reliable. Polished nickel plated case. 2½ inch diameter dial.
CLOCK, Interval Timer, Electric—This combination clock and interval timer is electrically operated, so requires no winding.
It has a clearly graduated clock dial and a large interval dial near the top of the instrument, graduated from 1 to 120 minutes in accurate minute graduations. The clock dial has a sweep second hand for indicating seconds, and a two-color dial with separate especially-clear graduations for the second hand. The dial of the interval timer is set from the front by means of a convenient knob, and can be turned in either direction. The clear-toned buzzer signal is adjustable for loud or soft tone, and for duration, from a short signal of a few seconds to a persistent one of several minutes.
This clock is housed in an attractive Richelain molded case, which is di-electric and acid- resisting. The size is about 5 inches by 6 inches and it may either be hung on the wall or set on a shelf. The finish is a rich, black, grained walnut.
STOPWATCH—With a 30 second dial divided into 1/10 second divisions. This facilitates the most accurate readings, as most stopwatches are only divided into ¼ second divisions. The I.C.A.A.A.A. recently decided that all intercollegiate track events shall be timed to 1/10 seconds to secure a more accurate timing in speed contests in America. This stopwatch is not only used on the large American tracks but also in the physical, chemical, astronomical and engineering departments of universities. In nickel case; 11 jewels.