H to Halogen

to Half bearing

H. Henry'­
H. Symbol for Plack's constant, spe­cific enthalpy..
Ha' H~, Hy' Hs' The lines of Balmer series in the hydrogen spectrum with wavelengths of 656.299 nm, 486. I 52 nm, 434.067 nm and 410.194 nm respectively. The se­ries continues into the ultraviolet, where about 20 more lines are observable. Hand N. Hum and noise.
Haas Effect. Characteristic of hear­ing whereby identical sound emit­ted from two or more points seems to come from the nearest point due to latter's precedence in time.
Hack. To cut roughly in an unwork­ manlike manner.
Hackling. (Textile) A process for sepa­rating woody particles and tow from long flax fibers.
Hack saw. A light-framed saw used for cutting metal, operated by power or by hand.
Haner/Garzon. Name of method for deriving ambient type information from conventional stereo signals by extracting out-of-phase components for reproduction via rear loud­speakers. System proposes by David Hafler and Micheal Gerzon. HaCt. A handle as of a dagger, a knife,or an awl.

Hair. (Plaster.) Hair for use by plas­ters is obtained from hides of cat­tle. It is washed, dried, and put up for sale in bushel bags, weighing 7 or 8 pounds to bag. Asbestos and manila fiber are both used in place of hair.
Hair hook. (Plaster.) A tool consist­ing of two or three prongs, fixed at right angles to a long handle; used to incorporate hair with mortar.
Hair hygrometer. A hydrometer that depends for its action on the in­crease in length of a hair occuring when the relative humidity of the surrounding air increases.
Hair line. (Print.) The thin line of a type face connecting or prolong­ing its parts.
HalC-back bench. saw. (Wood wk.)Gives both the advantage of a stiff cutting edge and the. ability to cut entirely
through the work. Usually made in 14 to 20-in. lengths. The stiffening bar extends over only a portion of the blade length thus combining the action of both the handsaw and the backsaw. .
HalCbearings. (Mach.) Bearings such as are used on railway cars where the load is constantly' in one direction and sufficiently heavy to hold the journal against the bearing.

Half binding to Halogen
Half binding. (Bookbndg.) A book with leather back and comers, and stiff sides covered with cloth or paper. Half cell. One electrode of an electro­lytic cell and the electrolyte with which it is in contact.
Half-diamond indention. (Print.) When successive lines of a piece of printing are shortened at both ends.
Half-lap joint. (WQodwkg.) A joint made by cutting away half of the thickness of the pieces to be joined. (SEE HALVING.)
Half-room stake. (Art Met.) A stake with the top curved and beveled to an edge. Its principal use is in cir­cular flanging operations.
Half life. The time required for one half of the atoms of any given amount of a redioactive substance to disintegrate.
Half moon. The moon when at either quadrature, half its disk is illumi­nated.
Half power Bandwidth. Frequency band over which power amplifier will deliver not less than half its normal full rated power. Often called power band-width refers to 3 db or half-power limits.
Halfnut. (Shopwk.)A nut which is split lengthwise. Sometimes half is used and rides on a screw; in others, both halves clamp around a screw as in the half nut of a lathe carriage.
. Half pattern. One of the halves of a pattern which is parted through the center for convenience of molding.
Half-round file. A file which is flat on one side and curved on the other. The amount of convexity never equals a semicircle.
Half section. (Draft.) In mechanical drawing, a sectional view which terminates at the center line, show­ing an external view on one side of the center line, and one the other side an interior view. (Tel.) Type of filter circuit, commonly used in loud speaker crossovers.
Half story. (Arch.) That part of a pitched roof structure directly un­der the roof, having a finished ceil­ing and floor and some side wall.
Half title. (Print.) A short title head­ing; a one-line title on a full page, or the title of a book placed on the first page of the book preceding the full title.
Half tone. (Print.) A kind of photo­engraving, in which relief lines are produced by etching a plate that has received the photographic pic­ture through a fine-ruled glass screen having 55 to 200 lines to the inch.
Half-tone paper. (Paper and Print.) A smooth printing paper used for reproducing half tones.
Half-vlaue thickness. The thickness of a uniform sheet of material which, when interposed in a beam.
of radiation, will reduced the in­tensity or some other specified property of the radiation passing throuh it to one half. The half­value thickness is often used as a means of defining the quality of the radiation.
Halogen. (Chern.) "Salt former." Ap­plied to the family of elements consisting of fluorine, chlorine, bromine, and iodine.