number of small holes through which the oil escapes to the jour nal and in which are placedpins to keep them clear and facilitate the escape of the oil. To the front side of the cup is secured an open glass tube the lower end of which is connected with a hole in the cup so that it can be seen by simply opening the door how much oil there may be in the cup., scientific american, 1876
number of small holes through which the oil escapes to the jour nal and in which are placedpins to keep them clear and facilitate the escape of the oil. To the front side of the cup is secured an open glass tube the lower end of which is connected with a hole in the cup so that it can be seen by simply opening the door how much oil there may be in the cup., scientific american, 1876
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