Scientific apparatus and instruments; Induction coils
The Ruhmkorff induction coil consists of two separate coils of wire one inside the other wound around a cylinder with a central core of soft iron rods. When a current is passed through the first primary coil, current is induced in the secondary...
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...
Scientific apparatus and instruments; Santa Clara University (Calif.); Induction coil
The Ruhmkorff induction coil consists of two separate coils of wire one inside the other wound around a cylinder with a central core of soft iron rods. When a current is passed through the first primary coil, current is induced in the secondary...
Scientific apparatus and instruments; Santa Clara University (Calif.); Galvanometer
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...
Agnews State Hospital (San Jose, Calif.); Arbuckle, Clyde, 1903-1998; Buildings; Photographs; Santa Clara County (Calif.)--History;
Black-and-white photograph of Agnews Asylum under construction. Agnews was a state institution for the mentally ill completed in 1888 at a cost of $750,000. It had a frontage of 750 feet, and housed over 900 patients. It was the predecessor of the...
Arbuckle, Clyde, 1903-1998; Carriages & coaches--American--California--San Jose; Education; Elementary school buildings; Elementary schools; Horses; Photographs; San Jose (Calif.); Santa Clara County (Calif.)--History; Transportation;
Photograph of Horace Mann School, circa 1895. Horace Mann was San Jose's first "big" school building. Built in 1868 at a cost of $22,000, it was heavily damaged in the 1906 earthquake and had to be demolished. The current Horace Mann...
Scientific apparatus and instruments; Electric batteries
Grenet Batteries were single-element battery sources with flasks varying in size, from 1/3 liter to 3 liters. These batteries, when filled with an acid solution and placed in series, were a common source of electrical current prior to the...
California--History--1800-1850; Diversity; Indians of North America ; Mission Period; San Jose (Calif.); Santa Clara County (Calif.)--History;
August 3, 1808 document from Jose Maria Estudillo in Monterey to the Commissioner of the town of San Jose. Estudillo urges kindness and fair treatment of the "heathen" Indians who are to be brought in to help with the current harvest,...
Scientific apparatus and instruments; Santa Clara University (Calif.); Electric batteries
Grenet Batteries were single-element battery sources with flasks varying in size, from 1/3 liter to 3 liters. These batteries, when filled with an acid solution and placed in series, were a common source of electrical current prior to the...
