r an observation of these preciable. On the 20th of September last a severe dark plates, there was the disadvantage of the incon- storm caused the fusion of a telephone wire, leaving stancy of illumination, the details being seen more dis- the earth wire which ran down along this wall intact,… … dust by heat, the space between the glass ring and Tlluminating Box for average and dividing by the number of liters of air watch glass being filled with vaseline. lamp. transperting glass locks. which traverses the apparatus. Before beginning an experiment, the watch glass An interesting method…
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