英和和英

an apparatus called sensor

a sopranino recorder

a device used to detect the presence of electric waves

radar equipment

a monitor

an examination for service

an apparatus called thermobarometer

under surveillance

the line on the monitor vacillated

an observation-post

an army of observation

a radar system called "active satellite to operate a phase"

take over the watch

to keep watch over something

the role of keeping watch

an observation device called meteorological radar

radar used in weather forecasting

a lookout man

a kind of radar device called over-the-horizon radar

the Commissioner of the Metropolitan Police

an investigator who observes carefully

a deadbeat controller

an instrument for checking short circuits, called a ground detector

a daimyo's monitor

a time-measuring system

a device which detects contamination by the amount of odor emitted, called a scentmeter

a recording barometer

to supervise something

a tide-waiter

keep under surveillance