Mica
['maɪkə]
Definition
(noun.) any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity.
Editor: Rochelle--From WordNet
Definition
(n.) The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in composition, and vary in color from pale brown or yellow to green or black. The transparent forms are used in lanterns, the doors of stoves, etc., being popularly called isinglass. Formerly called also cat-silver, and glimmer.
Checker: Wilbur
Examples
- Resting on the cylinder was a palladium-faced pen or spring, which was attached to a mica diaphragm in a resonator. Frank Lewis Dyer. Edison, His Life and Inventions.
- Mica, which so many people know as isinglass, is one of the most important materials in the manufacture of the standard electric iron. Various. The Wonder Book of Knowledge.
- The result was a double heating element in the form of a V, the resistance wire used being symmetrically wound on a flat, thin mica core. Various. The Wonder Book of Knowledge.
- SHOWING A BOX OF IMPORTED MICA Above on the table, a stack of cores and several elements ready for insertion in the iron. Various. The Wonder Book of Knowledge.
- At the edge of the table is a stack of mica strips known as cores. Various. The Wonder Book of Knowledge.
- The heating element is of the radiant type, made of flat resistance wire wound on mica and placed in a vertical position between the two bread racks. Various. The Wonder Book of Knowledge.
- If a strip of glass, rubber, mica, or paraffin is introduced anywhere in a circuit, the current ceases. Bertha M. Clark. General Science.
- He suggested the cutting out of the mica pieces almost to the bottom, leaving the commutator bars separated by air-spaces. Frank Lewis Dyer. Edison, His Life and Inventions.
- He was also the first to use mica in insulating the commutator sections from each other. Frank Lewis Dyer. Edison, His Life and Inventions.
- After the required heat has been reached, the forgings are allowed to either cool in the air, be covered with pulverized mica, or quenched in a special solution, as the case may require. Various. The Wonder Book of Knowledge.
- Admitting then that gneiss, mica-schist, granite, diorite, etc. Charles Darwin. On the Origin of Species by Means of Natural Selection.
- The highest grade mica comes from India and the open box in the picture shows thin, transparent pieces just tumbled out (Fig. 5). Various. The Wonder Book of Knowledge.
- It was in his machine also that mica was used for the first time as an insulating medium in a commutator. Frank Lewis Dyer. Edison, His Life and Inventions.
- In 1834 William Marr of England patented a lining for a double metallic chest, filled with non-combustible materials such as mica, or talc clay, lime, and graphite. William Henry Doolittle. Inventions in the Century.
- The heating element is made of flat ribbon resistance wire wound on mica, then bent into the form of a cylinder to fit into the German silver shell. Various. The Wonder Book of Knowledge.
Editor: William