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在天然光源中,不只包括太阳、月亮和恒星。闪耀夺目的闪电、火山喷发和森林火灾的烈火、极光、所谓“桅头电光”——大气无声放电、许多水生微生物、深水鱼与萤火虫,都产生光。在沼地上,腐败产物——沼气往往也会着火发光。人类创造的光源更加多种多样。其中的几种画在封底的正当中。1-A,普通白炽电灯;1-B.探照灯的白炽电灯;2.气光管(电虹灯);3.内壁涂有荧光质的低压水银灯(日光灯);4.超高压水银灯;5.水银石英医疗用(太灯阳灯);6.弧光灯;7.产生紫外
In natural light sources, not only the sun, moon and stars are included. Glowing lightning, volcanic eruptions and fires in forest fires, auroraes, so-called “steam lights”—silent atmospheric discharges, many aquatic microbes, deep-water fish and fireflies all produce light. On the moor, the product of the corruption, the biogas, often catches fire. Light sources created by humans are more varied. Several of these paintings are in the back cover. 1-A. Incandescent incandescent lamp; 1-B. Incandescent lamp for searchlight; 2. Gas tube (electrical); 3. Fluorescent low-pressure mercury lamp (fluorescent lamp) coated on the inner wall; 4. Ultra-high pressure mercury lamp; 5. Mercury quartz medical (Taiyang lamp); 6. Arc lamp; 7. Produce ultraviolet