signal by means of a mirror and the using the sun's rays
an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
heliograph 片语
片语
triangulated heliograph survey三角高程测量
heliograph paper照相版纸
radio heliograph射电日象仪
heliograph h日照计
monochromatic heliograph单色日光仪
heliograph signaling太阳反光镜
heliograph 例句
英汉例句
by using data of nobeyama radio heliograph , we calculate value of magnetic field in lower corona in some active region from thermal bremsstrahlung, and preliminary result has been obtained.