Word: instrument
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Dates: during 1880-1889
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...great an interest is taken, at the present time, in the various N. H. courses, and as several of these courses have a more or less elaborate system of laboratory work with the microscope, it was thought that a brief sketch of the instrument and its possibilities would be acceptable...
...beginning of the microscope of to-day is traceable to the small, single lens instrument of the sixteenth century, called at the time Vita pulicaria, or flea-glass, because by its aid the true beauty of the flea, in outline and detail, was first brought clearly before the public eye. Aside from the great advantage accruing to mankind from a just appreciation of the flea, the learned men of the time declared that, with this wonderful machine, they had discovered many new monsters; and one savant affirmed that he had seen the devil himself...
...wonder, in view of these facts, that the microscope received much attention, and as early as the first part of the seventeenth century the "compound microscope" was invented. Henceforth the progress of the instrument was that of mechanical skill and scientific knowledge. The establishing of the theory of Achromatics, late in the last century, brought the microscope rapidly forward, and the date of 1807 finds us with an "a chromatic microscope," embracing all the main features of the present instrument...
...conception is can be learned any day by a visit to the work-shop of a practical microscopist. His resplendent "double barrel" binocular is kept carefully under cover, at ordinary times, and only brought out for exhibition, while the real work is done with a smaller and apparently inferior instrument...
There is another instrument for detecting disturbances of terra firma. called the "Seismiscope" which was used by the Geological survey, and by Prof. Young at Princeton for this same explosion...