The artist made this painting based on Moses Schallenberger's description of his cabin at Truckee Lake Camp (today known as Donner Lake). He described it as a windowless cabin twelve by fourteen feet, covered with rawhide and brush as a roof, with...
The Goniometer is an instrument for measuring the angles of crystals by observing the direction of a beam of light reflected from their face. The instrument was invented by W.H. Wollaston in 1807. Physical Description: Round brass base with black...
Scientific apparatus and instruments; Optical instruments
The spherometer was used to measure the curvature of lenses. Physical Description: In mahogany case with sliding lid. Calibrated brass disk on three legs.
Galvanometer; Scientific apparatus and instruments
A galvanometer is an instrument used to measure the presence, direction, and strength of small electric currents in a conductor. A magnetic needle is deflected by the presence of an electric current in a nearby conductor. The needle turns at right...
