round blue sonar sreen

steampunk steam punk cogwheel mechanical mechanic machinal power-driven techno screen equalizer oscilloscope oscillograph wave signal grid monitor monitor screen sonar radar echo-sounder fathometer scientific science sciential technique technology engineering technics recorder pulse momentum impulse impetus impulsion impact sound tune bell blast noise sinusoid tachograph modulation electronic test seismogram sonic radar radiolocator radiodetector round circular rotund cool orbicular moony circle globe ball disk metallic metal metalline tin-pan brassy ironwork iron blue