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Topic: Hertz horn

	J.C. Bose: 60 GHz in the 1890s
		He used waveguides, horn antennas, dielectric lenses, various polarizers and even semiconductors at frequencies as high as 60 GHz; much of his original equipment is still in existence, now at the Bose Institute in Calcutta.
		James Clerk Maxwell's equations predicting the existence of electromagnetic radiation propagating at the speed of light were made public in 1865; in 1888 Hertz had demonstrated generation of electromagnetic waves, and that their properties were similar to those of light [1].
		Hertz had used a wavelength of 66 cm; other post-Hertzian pre-1900 experimenters used wavelengths well into the short cm-wave region, with Bose in Calcutta [7,8] and Lebedew in Moscow [9] independently performing experiments at wavelengths as short as 5 and 6 mm.
	www.tuc.nrao.edu /~demerson/bose/bose.html (2868 words)

	SETI Article: SETI Horn of Plenty
		One of Tony's antennas, used for 2.4 GHz satellite reception, is shown in Figure 9, and was an inspiration for the SETI Horn of Plenty.
		The four horn sections are joined to 1" wide by 1/8" thick aluminum angle stock (sold locally at 75 cents per foot) with pop rivets.
		However, the horn's excellent broadband impedance match, inherent lack of overspill, and low sidelobes mean its ground noise pickup will be significantly less than that of alternative antennas, providing a greater signal to noise ratio than one would expect from gain figures alone.
	www.setileague.org /articles/horn.htm (1887 words)

	edgarinterview
		Essentially, the ideal horn driver is a mass-less piston, and when the mass reactance is equal to the acoustical throat resistance of a horn, the horn response rolls off.
		I designed my horns so that the bass horn would roll off at the point where the midrange horn was turning on and the midrange horn rolled off where the tweeter was turning on.
		In the pass band, the horn response is minimum phase, like most loudspeakers, but at the point where they start rolling off, near the flare frequency or at the point where the mass is rolling off the response, the phase changes at those points are very fast.
	www.positive-feedback.com /Issue4/edgarinterview.htm (13289 words)

	Big Horn Diagram
		One of the largest Air Chimes, this trio of 8-inch-diaphragm horns produces a harmonious 3-note (85-, 110-, and 135-hertz) chord, producing 143 decibels at 100’.
		Each bell and diaphragm are a different size and are tunable, a feature which led to this horn model’s demise.
		Commonly known a fog horns, they are designed to produce very low notes, to travel longer distances.
	www.big-horn.com /diagram.html (813 words)

	Hertz, Gustav - Hutchinson encyclopedia article about Hertz, Gustav
		Gustav Hertz was born in Hamburg, Germany, and obtained his doctorate in Berlin in 1911.
		Because of his Jewish descent, Hertz was forced to resign in 1935.
		He is the nephew of Heinrich Hertz, the discoverer of radio waves.
	encyclopedia.farlex.com /Hertz,%20Gustav (280 words)

	hertz (science) - Hutchinson encyclopedia article about hertz (science) (Site not responding. Last check: )
		SI unit of frequency (the number of repetitions of a regular occurrence in one second).
		Radio waves are often measured in megahertz (MHz), millions of hertz, and the clock rate of a computer is usually measured in megahertz.
		The unit is named after German physicist Heinrich Hertz.
	encyclopedia.farlex.com /hertz%20%28science%29 (137 words)

	Hertz - meaning of word
		It is named in honour of the Germany physicist Heinrich Rudolf Hertz who made some important contributions to science in the field of electromagnetism.
		One hertz simply means "one per second" (1 / s); 100 Hz means "one hundred per second", and so on.
		The name hertz was adopted by the CGPM (''Conférence générale des poids et mesures'') in 1960, replacing the previous name for the unit, ''cycles per second'' (cps), along with its related multiples (''kilocycles'', ''megacycles'', and so forth).
	www.wordsonline.org /Hertz (523 words)

	ipedia.com: Tweeter Article (Site not responding. Last check: )
		The range of frequencies is typically from around 2000 Hertz to 20,000 Hertz but some tweeters reach up to frequencies of 30,000 Hertz and on...
		The range of frequencies is typically from around 2000 Hertz to 20,000 Hertz (generally considered to be the upper limit of human hearing) but some tweeters reach up to frequencies of 30,000 Hertz and one exotic example is claimed to reach up to 100,000 Hertz.
		Tweeters for sound reinforcement and public address applications are often horn loaded piezoelectric speakers.
	www.ipedia.com /tweeter.html (166 words)

	[No title]
		A 500 Hertz tone means the cone, coil and former has to move 500 times a second.
		When we talk about a one inch or two inch horn, we are actually referring to the opening between the compression driver and the horn flare.
		A horn flare keeps the acoustic energy that passes through it contained in a given area.
	www.tfwm.com /documents/306_hertzsogood (1548 words)

	Sax on the Web > Vintage Saxophones by Pete Hales > What is the Best sax for Me?
		Horns produced prior to 1880 were available in a wide variety of pitches and most should be considered only as collector's horns, not playable instruments.
		A relacquered horn can be extremely difficult to detect and it's really not fun to find out the supposedly minty 1962 Selmer Mark VI you paid $4000 for is now worth $2000 or less because it's relacquered.
		Even though the cost of maintaining a vintage horn may be high, a professional vintage horn is generally extremely inexpensive in comparison to a modern horn and can give you equivalent, if not better value.
	www.saxontheweb.net /Resources/BestVintageSax.html (2070 words)

	TrainHorns.net - Tyfon
		The horns were very simple in that the only parts were the horn itself, a screw-in back cap, and either a single or multi-leaf diaphragm, making the horns consist of very few parts.
		The "sound chamber" and "base" portion of the horn was cast separate from the bell, which treaded to the base.
		A-75s were least common, and were usually used as a secondary horn on the back of a switcher, or as a back-up horn on the backs of old covered wagons.
	trainhorns.net /leslie/tyfon.html (1383 words)

	Compact Bass Guitar Speaker Bottom
		SWR and Eden use piezo horn tweeters and spec their systems up to 12 and 13 kiloHertz respectively.
		Their efficiency can be tweaked up a bit into the low 90's by using a short horn aperture to shape their directivity pattern.
		In the end I chose an 800 Hertz crossover point and 24 dB/octave acoustic slopes for both sections of the crossover.
	www.core-sound.com /bottom-article.html (4053 words)

	American Horn Quartet--Archives
		Participants at the IHS Horn Symposium at the University of Missouri, Kansas City.
		April 19-22: Recital and performance of Schumann's konzertstuck at the SE IHS Horn Workshop at West Virginia University.
		Recital in Hertz Hall on January 31, and performance of Schumann's Konzertstück on Feb 1.
	www.hornquartet.com /archive.html (2106 words)

	exoticbookings
		The protuberances around the top of the mine, called Hertz horns, are part of the detonation mechanism.
		Early mines had mechanical mechanisms to detonate them, but these were superseded in the 1870s by the Hertz Horn (or chemical horn), which was found to work reliably even after the mine had been in the sea for several years.
		When a ship's hull crushes the metal horn, it cracks the vial inside it, allowing the acid to run down a tube and into a lead-acid battery which until then contains no acid electrolyte.
	www.exoticbookings.com /articleresources/?title=Naval_mine (5375 words)

	Mines in the RJW period - Gamesquad Forums (Site not responding. Last check: )
		Russian mines were of truncated conical or later spherical shape with Hertz Horns.
		The latter, invented in 1868, were a development of the Jacobi type used by the Russians in the Crimean War (a well caulked wooden keg with coned ends and five fuses).
		In the Hertz Horn type a glass tube contained battery electrolyte which activated an internal battery and fired the mine when the tube was broken by hull contact with the mine.
	www.strategyzoneonline.com /forums/showthread.php?goto=newpost&t=41371 (699 words)

	THE BIGGEST HORN SUB OF THE WORLD
		Many times to build bass horns everybody follows manual and books (and thats good to do, theory always teaches, experience is something else), we also have books but experience is much more worth and in this case the horn MUST not be seen by itself.
		Talking about a BIG HORN SUBWOOFER there is something that I think people normally forget or do not take into consideration (and maybe books do not explain) that is the dimension of the room and the position of the horn mouths toward the listening point plus the shape of the room.
		The room itself as it has been shaped is a horn below 20 Hz, then actually the holes in the floor are not really the final mouths below this frequency and the length from the throat to the listening position is half of a wavelength of 10 Hz.
	www.royaldevice.com /custom.htm (2968 words)

	HertzMusic - Strygere, Horn, Fløjter og tilbehør
		Vi har eksisteret siden 1986 og sælger et stort udvalg af de førende instrument fabrikater.
		eks.: Weril, Kanstul, Yanagisawa, Jupiter, Selmer, Hertz, HertzStrings, Pearl, RICO, Ibanez, Tama, Ketron, KandM og mange mange flere…..
		Her er HertzMusic's blog (Åbner i et nyt vindue) hvor jeg skriver om den daglige gang i HertzMusic.
	www.hertzmusic.dk (656 words)

	German Mines
		In 1868, the Hertz horn was invented (see British Mines and USN Mines) and by 1914 these had become the most reliable way to detonate contact mines.
		Large stocks of reliable Hertz horn contact mines were available, all equipped with automatic anchors that used hydrostats to set mine depth and lock the mooring cables.
		Used four Hertz horns and mooring depth was 98 fathoms (180 m).
	www.navweaps.com /Weapons/WAMGER_Mines.htm (2225 words)

	PSW Sound Reinforcement Forums: LAB Subwoofer => Need midrange cabinet modeling tips, am I on the right track?
		Unless you have the space to make a 100 Hertz horn (In depth) in addition, to creating the proper mouth size when using multiple boxes, the vented route is the better than keeping the internal chamber sealed.
		But when you use them in mulitples (lets assume the horns are positioned properly in regards to coverage patterns) the horns will cover just a particular part of the audience.
		Below the horns pattern control cutoff (assuming it being decently low) the output from the different cabinets will add together (assuming they are within 1/4 wl or so) and will sum together, adding to the output at the lower freq.
	srforums.prosoundweb.com /index.php/m/200614/0 (3338 words)

	Re: theory fundamentals 101, answer me this...
		In terms of bass most people agree that around 20 hertz is the lowest note you can hear.
		Above and below 20 hertz you can feel the frequency resonating in your chest or on your skin but below 20 hertz your ears will not really notice anything.
		It will be tough to build anything without a few calculations especially if you are trying to build a horn or band pass which are known for being difficult.
	www.diysubwoofers.org /talkshop/messages/31545.htm (232 words)

	Warning Horn On Naval Ships
		Horn of Africa, two SH-60H Seahawk helicopters from HS-11, based out of Naval...
		HORN: Is it true that at the beginning of June 1941 a law was passed in the United States confiscating foreign ships...
		An admiral is a senior ranking officer in the U.S. Navy, but his title comes from the name given the senior ranking officer in the Moorish army of many years ago.
	www.boats-to-buy.com /warning-horn-on-naval-ships.html (981 words)

	Glossary of Audio Technical terms.
		The number of waves (or cycles) arriving at or passing a point in one second, expressed in hertz (Hz).
		One hertz is equal to one cycle per second.
		The hertz is named for H.R. Hertz, a German physicist.
	www.newformresearch.com /audio-tech2.htm (340 words)

	Invention: Wall-beating bugging - mech-tech - 25 October 2005 - New Scientist
		The system uses a horn antenna to radiate a beam of microwave energy —between 30 and 100 gigahertz — through a building wall.
		If people are speaking inside the room, any flimsy surface, such as clothing, will be vibrating.
		The effect requires about 100 volts at several hundred hertz but very low current — similar to a pocket LCD screen.
	www.newscientist.com /article.ns?id=dn8208 (845 words)

	Re: This Hertz (Site not responding. Last check: )
		That's the lowest note that can be produced using the acoustics of the horn rather than tongue or lip clicks.
		Adding the valves lets you lower it, but even with a 5 valve horn, you could never drop a whole 'nother octave.
		Re: Re: This Hertz Rick Denney 09:31:45 9/04/2003 (
	www.chisham.com /tips/bbs/aug2003/messages/145220.html (244 words)

	The Development of Naval Minewarfare
		On being struck by a vessel, the Hertz horn crushes and allows the electrolyte to come into contact with two terminals in the firing circuit and thus actuates the mine.
		This is much more reliable than a 'switch horn' which easily corrodes and it provides a long-lasting source of electricity to power a detonator whereas a battery decays over time.
		This comprised a lead horn encapsulating a glass phial containing sulphuric acid around which was a mixture of potassium chlorate and sugar.
	www.mcdoa.org.uk /Development_of_Minewarfare.htm (8721 words)

	Can You Design Me a Crossover That: - Page 2 - Lansing Heritage Forums
		This should be high enough to let the horn operate within its range while reducing the size of the "hole." A two-way that retains the N8000 would work fine.
		The longer H92 at 800Hz came closer to matching the 1200Hz crossover with the H91 horn, again allowing the woofer phase to be the same as the HF.
		There is no question that that horn works very very well with the 2235 woofer (and with some tweaking others) and will result in a quantum leap in subjective improvement over any reworked crossover for the device on hand (horn) in IMHO
	www.audioheritage.org /vbulletin/showthread.php?t=8507&page=2 (2315 words)

	Physics Today March 2004- Acoustics Experiment Shows Why It's So Hard to Make Out the Heroine's Words at the Opera
		and its overtones--that is, at discrete frequencies hundreds of hertz apart.
		Adjacent to a microphone touching the subject singer's lower lip is an acoustical current source--the output horn of an electronic sound synthesizer that is calibrated to present the microphone with a flat broadband frequency spectrum when the singer is silent with her mouth closed.
		In the Sydney experiment, the subject sang a sustained note with a given vowel sound while the synthesizer was on.
	www.physicstoday.org /vol-57/iss-3/p23.html (1461 words)

	Hertz car rental - hertz renta car
		The Hertz Corporation, the largest generaluse car rental company in the world, and a leading equipment rental companyin the United States and Canada, plans to hold a conference call onTuesday, May 30th to discuss its First Quarter 2006 and Year End 2005financial results.
		In addition, Hertz's Form 10-Q for the quarter endedMarch 31, 2006 has been filed with the Securities and Exchange Commission.
		The answer may surprise you, because it signifies individual personality and overall health, and even points to changes on the horizon, according to Kenneth Manley of The Full Circle Aura Co. in Waltham.
	www.inquireworld.com /He-to-Ho/cat.php (1419 words)

	Equestrian ballet returns / It will be highlight of biennial festival of early music
		JUNE 5: The Artaria Quartet: Eric Hoeprich, basset clarinet; Marc Schachman,
		oboe; R.J. Kelley, horn; wind quintets of Mozart.
		JUNE 6: Chamber Chorus of the University of California: Marika Kuzma, director; "Voices of Byzantium": Eastern Psalmody From Mount Athos to Moscow.
	www.sfgate.com /cgi-bin/article.cgi?file=/chronicle/archive/2002/03/12/DD40891.DTL&type=printable (461 words)

	Hertz 87,9 - Campusradio für Bielefeld
		Hertz 87.9 verhilft euch schon 2 Monate vor dem offiziellen Frühlingsanfang zu den richtigen Gefühlen!
		Vor nicht allzu langer Zeit hat Hertz 87.9 Musiker aus Bielefeld aufgefordert eine Hymne für Hertz zu machen.
		Jeder Radiosender, da bildet Hertz 87,9 keine Ausnahme, kriegt haufenweise Platten zugeschickt.
	www.radiohertz.de /pages/Archiv__.php (5071 words)

	Rane Professional Audio Reference (H)
		Hertz, Heinrich Rudolf (1857-1894) German physicist who was the first to produce radio waves artificially.
		Having alternating currents of two different frequencies that are combined to produce two new frequencies, the sum and difference of the original frequencies, either of which may be used in radio or television receivers by proper tuning or filtering.
		A sound radiator cone mounted onto a loudspeaker diaphragm to amplify its output based on the same principal found in musical instrument horns.
	www.rane.com /par-h.html (3680 words)

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