在生理、药理、病理生理的实验中,往往要用到烟鼓。烟鼓描记法有不少缺点:(1)需鼓要用煤油灯烟将记纹纸熏黑,而在操作时为了熏得均匀,灯焰不能摆动,要关闭门窗,于是室内浓烟滚滚,极不卫生;(2)在实验中一不小心就会将纸上的烟黑碰去,从而影响记录;(3)实验后还需用松香酒精溶液固定,费料,费工,还不美观。 In the physiological, pharmacological, pathophysiological experiments, often use the smoke drum. There are many shortcomings of the smoke drum tracing method: (1) need to use kerosene lamp cigarette paper black smudges, and in operation, in order to smoked even, lamp flame can not swing, to close the doors and windows, so billowing indoor smoke, Very unhygienic; (2) accidentally in the experiment will smudge the smoke on the paper, thus affecting the record; (3) after the experiment also need to use rosin alcohol solution fixed, costly, laborious, not beautiful .