vernier-type wind gauge target sight

wind-gauge rear sight

oil gauge / oil-gauge

vernier sight

wind-gauge arc

wind gauge

wind-gauge diagram

depth vernier

range vernier

vernier

vernier engine

vernier engine cutoff

vernier error

vernier gear-tooth

vernier light

vernier plate

vernier propulsion system

vernier solo hydraulic power system

vernier tachymeter

vernier thruster

vernier window

wind rode / wind-rode

wind relative bearing / wind-relative bearing

wind's eye (in the wind's eye)

Eiffel-type wind tunnel

Gottingen-type wind tunnel

injector-type wind tunnel

slit type of sight

barleycorn-type fore sight

elbow-type telescopic sight

ramp-type sight

target scattering crossover / target scattering cross-section / electronic target profile

front sight (fore / muzzle sight)