Crossword clues for focal
focal
- Word with length or point
- Like the main point
- Word with point or length
- Photographic adjective
- More than important
- Main issue, ... point
- Kind of area
- Central (point)
- Word with point or plane
- Word before plane or point
- What the "f" of f-number is short for
- The ''f'' in f-stop
- Like the center of attention
- Kind of length or point
- F as in "f-stop"
- Centre, ... point
- -- point (center)
- ___ point (what everything centers around)
- ___ point (featured element)
- ___ point (center of attention)
- Kind of point or length
- Primary
- Centrally located, as a point
- The "f" in f-number
- Middle
- ___ point (very center)
- In the middle
- ___ point (hub)
- ___ point (center of interest)
- The "f" in f-stop
- At a central point
- Of a central point
- Converging on one point
- Kind of point or infection
- ___ point (center)
- Most important horse is fed carefully at first
- Centre Point's fine old state
- At the center
- __ point (center of attention)
- Type of point
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Focal \Fo"cal\, a. [Cf. F. focal. See Focus.] Belonging to,or concerning, a focus; as, a focal point.
Focal distance, or length, of a lens or mirror (Opt.), the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center.
Focal distance of a telescope, the distance of the image of an object from the object glass.
Douglas Harper's Etymology Dictionary
Wiktionary
a. 1 Belonging to, concerning, or located at a focus 2 (context medicine English) limited to a small area
WordNet
adj. having or localized centrally at a focus; "focal point"; "focal infection"
of or relating to a focus; "focal length"
Wikipedia
FOCAL (Forty-one calculator language) is the language used to program the HP-41 range of expandable science/engineering calculators from Hewlett-Packard.
As with most other calculator programming languages of the 1980s, a FOCAL program is a linear list of instructions. Each instruction (or step) roughly correspond to a key (or key combination) press, and thus correspond to what the user would do if he was to perform the computation himself on the calculator. This paradigm made FOCAL programming relatively easy for the newcomer, but program maintenance could be a nightmare. Add to that the use of GOTO instructions—including going to a program step based on a value in a data register ("GTO IND"), a technique known as computed goto—and you had all the ingredients for the dreaded spaghetti code syndrome.
Program steps are numbered starting from 1, but this numbering has no intrinsic meaning, and can change as new instructions are added or removed in the middle of a program. A special instruction LBL is used to create a label, that can be used by the user to invoke the program, or by the program itself, as target of a GTO (unconditional go-to) or XEQ (execute) instruction.
Here's a very simple FOCAL program:
001 LBL "DOUBLE"
002 2
003 *
004 END
- The LBL "DOUBLE" instruction is a label, indicating that the user can invoke the program by XEQ "DOUBLE". The name "DOUBLE" can also be assigned to any key on the user keyboard, effectively adding a new function to the calculator.
- The next two steps correspond to what the function does, mainly multiply the X register by 2 (the HP-41 uses RPN notation.)
- The END instruction indicates the end of the program.
Note that contrary to many other programmable calculators, each FOCAL step could be stored in memory as more than one byte. While the calculator memory could hold 2233 bytes of program code, no reported program actually reached this number of steps.
Focal or FOCAL may refer to:
- Focal (lexicographical website), an Irish lexicographical website
-
FOCAL (programming language)
- FOCAL-69
- Focal (HP-41)
- Focal Radio, a radio station based in Stoke-on-Trent, England
- FOCAL International, a trade body representing the film archive industry
- FOCAL (spacecraft), a proposed space telescope
- Focal-JMLab, a French manufacturer of audio equipment
FOCAL is an interpreted programming language resembling JOSS. The name is an acronym for Formulating On-Line Calculations in Algebraic Language.
Largely the creation of Richard Merrill, FOCAL was initially written for and had its largest impact on the Digital Equipment Corporation's (DEC's) PDP-8 computers. Merrill wrote the original (1968) and classic FOCAL-69 interpreters for the PDP-8. Digital itself described FOCAL as "a JOSS-like language."
Like early versions of BASIC, FOCAL was a complete programming environment in itself, requiring no operating system. As in MUMPS, most commands could be, and in practice were, abbreviated to a single letter of the alphabet. Creative choices of words were used to make each command uniquely defined by its leading character. Digital made available several European-language versions in which the command words were translated into the target language.
FOCAL is a proposed space telescope that would use the Sun as a gravity lens. The gravitational lens effect was first derived by Einstein, and the concept of a mission to the solar gravitational lens was first suggested by professor Von Eshleman, and analyzed further by Italian astronomer Claudio Maccone and others.
In order to use the Sun as a gravity lens, it would be necessary to send the telescope to a minimum distance of 550 astronomical units away from the Sun, enabling very high signal amplifications: for example, at the 203 GHz wavelength, amplification of 1.3·10. Maccone suggests that this should be enough to obtain detailed images of the surfaces of extrasolar planets.
Usage examples of "focal".
The upper right canine was pure titanium and for Eigenvalue the focal point of the set.
The last thing we can afford is to have the focal point of a simple, reasonable old female asking for the right to decline Eldership on her own.
The Forest sits at the heart of a whirlpool, a focal point of dark fae that draws like to like, sucking all malevolent manifestations toward its, center.
Now, once again, in the push to translate his prediction theory into a viable production prototype, feedback emerged as the focal point and final obstacle in his war work with Bigelow.
The military used SniperEyes, with enormously extended focal ranges and multiple grades of monatomic lasers to assess wind speed, air density and so forth.
The ceiling was pale cream with delicate yet simple plasterwork, but it was the bed that was the true focal point.
Other clients have accomplished the same thing by procrastinating, forgetting key appointments, or losing their Focal Point notebooks.
The focal point of the chamber was a high-backed steel and plastic chair with some particularly malignant stim feeders built into the back, the arms, and the headrest.
The house was in a beautiful state of preservation, as was the elderly butler who presently opened the door, and led her, at his own pace, across the narrow hall and up a handsome staircase to the drawing room--an apartment which took up a major part of the first floor, with windows both back and front and a vast chimneypiece the focal point of its further wall.
He knew that in a short while the Invaders would discontinue their attempts to make an immediate capture, would conclude that he had found shelter, and would fall back on an inescapable slow search that could not help but root him out sooner or later soon, if he stayed this near the headquarters that would be the focal point for the expanding boxes of a square search.
But in their way they serve as focal points in the modern world, places where the technology and the psychology of hurriedness come together.
Now the steps were the focal point for local idlers and off-duty, out of work iceboat crew.
But where they joined the gravityless focal structure, they were scarcely thick-stemmed enough to enclose the elevator shafts that ran the quarter-mile length of each.
Henry Meachem, the pirate whose crews had interbred with Carib and Jamaican women, thereby populating the island, and whose treasure was the focal point of many tall tales.
Focal epilepsy starts with a wave of electrical activity in a relatively small group of neurons, from whence it spreads across much of the brain.