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五、林火的发现和通讯 1、瞭望台全苏1981年统计有3268个瞭望台,分木质结构和金属结构。苏联还设计和使用型号为ПНМ—3的单杆式瞭望台,它主要是在混凝土基础上的单杆建筑,用拉绳把它固定在垂直位置,瞭望杯上装配有悬挂式自动升降室和平衡锤,室内有瞭望员座位、望远镜、方位盘、通讯工具等。据最近报导,在瞭望室内可安装探火电视。列宁格勒林研所与有关单位研制的电视装置,有转动的天线,可观察的林区范围约20～25公里。最近研制成的ПТУ—59型电视系统,可不间断地观察林区、在屏幕上可观察12—15公里半径直围
Fifth, the discovery of forest fires and communications 1, Observatory All Su-1981 Statistics 3268 Observatory, sub-wood structure and metal structure. The Soviet Union also designed and used a single-pole look-alike model number ПНМ-3, which is mainly a single-pole construction on a concrete foundation, which is fixed in a vertical position by a drawcord, which is fitted with a suspended automatic lift- Counterweight, indoor lookout seats, binoculars, azimuth disk, communications tools. According to a recent report, fire detection television can be installed in the look-out room. Leningrad forest research institutes and related units developed television installations, there are rotating antenna, the forest area can be observed about 20 ~ 25 km. The recently developed ПТУ-59 TV system, uninterrupted observation of the forest, on the screen can be observed 12-15 km radius straight