英和和英

mnemonic device

an optical instrument, called spectroscope

a device

experimental apparatus

a lens or mirror used to concentrate light on an object, called a condenser

an observation instrument, called microscope

surveying instruments

precision instruments

a device for projecting illuminated images, called a projector

a subtle device

analogue device

an explosive device

an optical device called a collimator

an ingenious device

an ingenious device

an ingenious device

an ingenious device

a detective device

an acoustic device

radar equipment

a device used by navigators for estimating the position of the sun when it is a few degrees below the horizon, called sky compass

a telescope

an {optical instrument} called spectrometer

apparatus for observation and measurement of optical phenomena

an optical device called radio telescope

an optical instrument called a Keplerian telescope

a spectroscope by which spectra can be photographed

an innovative device

optical instruments used by the military

steering-gear