Inventors . to be aimless ; for instance, the action of chemi-cals upon various substances or upon each of ivory in a certain oil become trans-parent in six weeks. A globule of mercury in THOMAS A. EDISON 255 water takes various shapes for the opposite polesof the electric-battery upon the addition of a lit-tle potassium. There is no present use for theknowledge of such facts, but it is recorded involuminous note-books, and some day the con-necting-link in the chain of an invaluable discov-ery may here be found. My next visit to Menlo Park was a few monthslater, when I found Ediso
Inventors . to be aimless ; for instance, the action of chemi-cals upon various substances or upon each of ivory in a certain oil become trans-parent in six weeks. A globule of mercury in THOMAS A. EDISON 255 water takes various shapes for the opposite polesof the electric-battery upon the addition of a lit-tle potassium. There is no present use for theknowledge of such facts, but it is recorded involuminous note-books, and some day the con-necting-link in the chain of an invaluable discov-ery may here be found. My next visit to Menlo Park was a few monthslater, when I found Edison in bed sick with dis-appointment. The lamps had again taken to an-tics for which no remedy or explanation couldbe discovered. There was an air of desolationover the place. The laboratory was cold andcomfortless. Upon every side were signs ofstrict economy. Most of the assistants wereyoung men glad to work for little or the last month Edison had been working in o the direction of a general impro
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