The UES II is a hydrostatically operated clock requiring an initial pressure equal to 17 feet for starting; however, it will continue to run even if pressure is removed. This clock can be set to arm the mine at any time from a half hour to six hours, in 15-minute inter-vals, or from a half day to six days at six-hour intervals. The purpose of this clock is to delay the mine circuit to prevent premature firing until the mine unit has properly orien-ted itself.

Figure 265 – UES II and UES IIa

Figure 267 – UES II/IIa