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特点:封口绝缘好,不易受气候影响,灵敏度高;指针由铝箔制成,价格低廉;制作方便。制作方法:结构如图 1.外壳:用5厘米宽的马粪纸卷成一只直径12厘米的圆筒和两只直径3厘米圆筒,把两个小圆筒胶合在大筒下做底座,在大筒的顶端开一直径2厘米圆孔。另用宽3厘米的马粪纸卷一只直径2厘米的圆筒,把它胶在大筒顶端孔中。 2.支架:取直径3厘米、长10厘米的铜梗,下端锉平约0.8厘米。在上端约4厘米处绕一些铜丝,焊
Features: Sealing insulation is good, not susceptible to climate, high sensitivity; pointer made of aluminum foil, low price; easy to make. Production method: structure shown in Figure 1. Shell: 5 cm wide horse manure paper rolled into a cylinder with a diameter of 12 cm and two cylinders with a diameter of 3 cm, and glued two small cylinders under a large cylinder to make a base. A 2 cm diameter circular hole is opened at the top of the large cylinder. Another width of 3 cm horse manure paper roll a diameter of 2 cm cylinder, glue it in the top hole of the big tube. 2. Bracket: Take a copper stem with a diameter of 3 cm and a length of 10 cm. The bottom end is about 0.8 cm. At the upper end, about 4 cm around some copper wire, welding