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Charles III, king of Spain, and of Naples and Sicily

(Encyclopedia)Charles III, 1716–88, king of Spain (1759–88) and of Naples and Sicily (1735–59), son of Philip V and Elizabeth Farnese. Recognized as duke of Parma and Piacenza in 1731, he relinquished the duc...

Lomonosov, Mikhail Vasilyevich

(Encyclopedia)Lomonosov, Mikhail Vasilyevich mēkhəyēlˈ vəsēˈlyəvĭch ləmənôˈsəf [key], 1711–65, Russian scientist, scholar, and writer, an outstanding figure in 18th-century Russia. Lomonosov was the...

La Mettrie, Julien Offray de

(Encyclopedia)La Mettrie, Julien Offray de zhülyăNˈ ôfrāˈ də lä mĕtrēˈ [key], 1709–51, French physician and philosopher. On the basis of personal observation he claimed that psychical activity is purel...

planter

(Encyclopedia)planter, farm or garden implement that places propagating material such as seeds or seedlings into the ground, usually in rows. Broadcasting, i.e., scattering seed in all directions, by hand followed ...

crucible

(Encyclopedia)crucible, vessel in which a substance is heated to a high temperature, as for fusing or calcining. The necessary properties of a crucible are that it maintain its mechanical strength and rigidity at h...

cellular telephone

(Encyclopedia)cellular telephone or cellular radio, telecommunications system in which a portable or mobile radio transmitter and receiver, or “cellphone,” is linked via microwave radio frequencies to base tran...

hygrometer

(Encyclopedia)hygrometer hīgrŏmˈətər [key], instrument used to measure the moisture content of a gas, as in determining the relative humidity of air. The temperature at which dew or frost forms is a measure of...

Monge, Gaspard, comte de Péluse

(Encyclopedia)Monge, Gaspard, comte de Péluse gäspärˈ môNzh kôNt də pālüzˈ [key], 1746–1818, French mathematician, physicist, and public official. He was distinguished for his geometrical research, whic...

graphene

(Encyclopedia)graphene, virtually transparent, highly conductive carbon material in which the atoms are organized into a honeycomblike arrangement and form a thin sheet that is one atom thick. Andre Geim and Konsta...

toy

(Encyclopedia)toy, article designed to be played with, chiefly for children. Archaeological research has revealed numerous playthings from prehistoric civilizations. Early Egyptian, Greek, and Roman dolls, tops, ba...