A dictionary of dental science, biography, bibliography, and medical terminology / by Chapin A. Harris.

  • Harris, Chapin A. (Chapin Aaron), 1806-1860.
Date:
1849
Catalogue details

Licence: Public Domain Mark

Credit: A dictionary of dental science, biography, bibliography, and medical terminology / by Chapin A. Harris. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    it is more liable, from a fall or other ac- cident, to break, and when broken, can- not be as easily repaired. Many den- tists, however, notwithstanding, use tliem, and when well adapted to the inequalities of the parts against which they are placed, they often subserve a very good purpose. But it is more diffi- cult to fit a piece of this description than single teeth to a metaUic base. See Mineral Teeth. BLOOD. Sanguis A red homo- genous fluid, formed chiefly from chyle, of a saltish taste, and glutinous con- sistence, circulating in the cavities of the heart, arteries and veins. The av- erage quantity of this fluid in an adult is estimated at twenty-eight pounds, and the veins are supposed to contain nearly four times the quantity that the arteries do. The blood in the arteries is of a florid red; in the veins it is of a dark brownish red, except in the pulmo- nary vessels. Here the color is reversed, the arteries containing the dark and the veins the red blood. Blood is composed of water, albu- men, fibrin, an animal coloring, a little fatty matter, and several salts. BLOOD-LETTING. Every artifi- cial discharge of blood procured for the prevention or cure of disease. An op- eration which consists in opening a ves- sel for the extraction of blood. It is di- vided into general and topical. Venas- section and arteriotomy are examples of the first, and the appUcation of leeches, or cupping glasses, after scarification, of the latter. BLOOD-ROOT. Sanguinaria cana- densis. BLOOD-VESSEL. A vessel con- taining and conveying blood. BLOW-PIPE. A cyUndrical tube of from twelve to eighteen inches in length, half or five-eighths of an inch in diame- ter at one end, graduaUy tapering to a fine point or nozzle, which may be straight or bent at nearly right angles, according to the purposes for which it is to be used. With an instrument of this sort, ^a jet of air may be injected into the flame of a lamp or candle, so as to divert it in a long and slender cone upon a piece of charcoal or other sub- stance placed to receive it. The greatest heat of a flame when thus urged is at the extremity of the outer or white flame, for the reason that the greatest amount of combustion is at this point. To the mechanical dentist, as weU as to the jeweller and chemist, the blow-pipe is of great importance. It is used for sol- dering and uniting the different metallic portions of a piece of dental mechanism. Blow-pipe, Elliot's Compound Self-acting. A combination of the common with the self-acting blow-pipe. Blow-pipe, Hook's Self-acting.— A brass globe composed of two hemis- pheres firmly fastened together, having an orifice at the top for the purpose of introducing alcohol, and a tube leading from the upper to the flame of a spirit lamp placed underneath the brass globe. When this is partly filled with alcohol, and a lamp placed underneath it, the alcohol is soon converted into vapor, which finding no vent excepting through a small tube leading lo the upper hemis- phere of the globe, is forced from the orifice of the tube directly against the flame of tlie lamp which ignites it and forms a jet of flame of great intensity. Blow-pipe, Parmly's Self-act- ing. An apparatus invented by Dr. Jahial Parmly of New York, consisting of a copper globe, about five inches and a half in diameter, and two alcoholic reservoirs, arranged in a small portable japanned tin case. One of the reser- voirs is placed beneath the globe on the floor of the case, which it completely covers. This is about an inch and a half deep, and in the centre of which, immediately beneath the globe, a burner is placed. The other reservoir is of the same size, and placed immediately above the globe. In the top of one side of this, one extremity of a curved tube or siphon, provided with a stop- cock, enters, while the other extremity