Methods of using the microscope, camera-lucida and solar projector for purposes of examination and the production of illustrations

For many years it has been customary in the best laboratories to mount various instruments of precision upon pillars of stone or masonry deeply imbedded in wells in the ground and passing upward throuigh the floors of the laboratory without contact. The object of this arrangement is to prevent tremors, which are of constant and inevitable occurrence in an inhabited building, from being transmitted to the instrument; the earth receives these tremors, and, within the limits of the precision of the instrument, they are nullified. Galvanometers, seismographs, balances and other instruments are mounted in this manner.

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MICROSCOPE, CAMERA-LUCIDA AND SOLAR PROJECTOR

THE DARK ROOM.

THE ILLUSTRATION ROOM.

A LIBERAL REDUCTION OF ORIGINAL DRAWINGS.

EXPERIMENT FIELD.