Search the Dictionary

pertaining to or designating plates, processes, or the pictures made by them, in which gradation of tone in the photograph is reproduced by a graduated system of dotted and checkered spots, usually nearly invisible to the unaided eye, produced by the interposition between the camera and the object of a screen. The name…

A small hole in a boiler for the insertion of the hand in cleaning, etc. Hand-hole plate, the cover of a hand-hole.

which the sound, which resembled the oboe, was produced by the vibration of thin metallic plates, acted upon by blowing through a tube.

A process of hardening the face of steel, as armor plates, invented by Hayward A. Harvey of New Jersey, consisting in the additional carburizing of the face of a piece of low carbon steel by subjecting it to the action of carbon under long-continued pressure at a very high heat, and then to a violent chilling, as by a…

ggregate surface exposed to fire or to the heated products of combustion, esp. of all the plates or sheets that are exposed to water on their opposite surfaces; -- called also fire surface.

(Naut.), a chain passing from the bowsprit cap around the heel of the jib boom. -- Heel plate, the butt plate of a gun. -- Heel of a rafter. (Arch.) See Heel, n., 7. -- Heel ring, a ring for fastening a scythe blade to the snath. -- Neck and heels, the whole body. (Colloq.) -- To be at the heels of, to pursue clos…

A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.

ld geckoes of the genus Hemidactylus. The hemidactyls have dilated toes, with two rows of plates beneath.

The sulphate of iodoquinine, a substance crystallizing in thin plates remarkable for their effects in polarizing light.

gle formed by the meeting of two sloping sides or skirts of a roof, which have their wall plates running in different directions.

frame or pedestal in which a railway car axle box slides up and down; -- also called horn plate. -- Horn of a dilemma. See under Dilemma. -- Horn distemper, a disease of cattle, affecting the internal substance of the horn. -- Horn drum, a wheel with long curved scoops, for raising water. -- Horn lead (Chem.), chlo…

A shoe for horses, consisting of a narrow plate of iron in form somewhat like the letter U, nailed to a horse's hoof.

at a given hour; the intersection of an hour circle which the face of the dial. -- Hour plate, the plate of a timepiece on which the hours are marked; the dial. Locke. -- Sidereal hour, the twenty-fourth part of a sidereal day. -- Solar hour, the twenty-fourth part of a solar day. -- The small hours, the early hou…

nosaur from the Tilgate Forest, England. It was about twenty feet long, protected by bony plates in the skin, and armed with spines.

The second lateral plate in the plastron of turtles; -- called also hyosternum.

r hagfish and the genus Bdellostoma. They have barbels around the mouth, one tooth on the plate, and a communication between tionnasal aperture and the throat. See Hagfish. [Written also Hyperotreti.]

The third lateral plate in the plastron of turtles; -- called also hyposternum.

One of the spiny plates foundon the back and tail of certain skates.

d to corresponding points in such focus; this may be received on a screen, a photographic plate, or the retina of the eye, and viewed directly by the eye, or with an eyeglass, as in the telescope and microscope; the likeness of an object formed by reflection; as, to see one's image in a mirror. Electrical image. See un…

A device on a shield or seal, or used as a bookplate or the like. [Written also imprese and impress.] My impresa to your lordship; a swain Flying to a laurel for shelter. J. Webster.