文章分析了电接点压力表触头烧蚀的原因，提出了无触点式压力表的改进方法。
In this article, the author analysed the cause of arc tip pressure meter scorched, an improved method for contactless pressure meter.
由于汽车上通常采用的有触点电喇叭存在触点容易烧蚀的缺点，所以对电子电喇叭的需求也就越来越多。
The contact horn usually fixed on auto is easy to be ablated, so the contactless horn is regarded for replacing the defect.
但绝不能用砂布，因为金刚砂会嵌入，使触点迅速烧蚀。
Emery cloth must never be used, since particles of emery may become embedded and cause rapid Burning away of the points.
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