The phototransistor was installed through holes in the top of the case, and enclosed in a brass tube that was painted black inside and out.
三极管是通过安装在洞上方的情况下，密封在一个黄铜管，这是手绘的
色内。
电晶体管The phototransistor was installed through holes in the top of the case, and enclosed in a brass tube that was painted black inside and out.
三极管是通过安装在洞上方的情况下，密封在一个黄铜管，这是手绘的色内。
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