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	Drum memory - Wikipedia, the free encyclopedia
		Drum memory was an early form of computer memory that was widely used in the 1950s and into the 1960s.
		Drums were later replaced by core memory, which was faster and had no moving parts, and which lasted until semiconductor memory entered the scene.
		A drum is a large metal cylinder that is coated on the outside surface with a ferromagnetic recording material.
	en.wikipedia.org /wiki/Magnetic_drum (401 words)

	Drum memory -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-22)
		The Magnetic Drum was invented by G. Taushek in 1932 in (A mountainous republic in central Europe; under the Habsburgs (1278-1918) Austria maintained control of the Holy Roman Empire and was a leader in European politics until the 19th century) Austria.
		Drum memory was an early form of (An electronic memory device) computer memory that was widely used in the (The decade from 1950 to 1959) 1950s and into the (The decade from 1960 to 1969) 1960s.
		For many machines, a drum formed the main working memory of the machine, with data and programs being loaded on to or off of the drum using media such as (A long narrow strip of paper) paper tape or (A card on which data can be recorded in the form of punched holes) punch cards.
	www.absoluteastronomy.com /encyclopedia/d/dr/drum_memory.htm (495 words)

	magnetic drum - Webopedia.com
		Magnetic drums were once used as a primary storage device but have since been implemented as auxiliary storage devices.
		The tracks on a magnetic drum are assigned to channels located around the circumference of the drum, forming adjacent circular bands that wind around the drum.
		Magnetic drums are able to retrieve data at a quicker rate than tape or disk devices but are not able to store as much data as either of them.
	itmanagement.webopedia.com /TERM/R/magnetic_drum.html (182 words)

	Magnetic drum separator technical and maintenance information from IMS Magnetic Mining
		Magnetic separation is used for the concentration of minerals and for the removal of suspended magnetisable particles in a fluid.
		The capacity of a magnet to lift a mineral is not only dependant on the field intensity but on the field gradient ie the rate at which the field intensity increases towards the magnet surface.
		All magnetic separators are designed to provide a magnetic field gradient, either in the gap between the poles of a magnetic circuit or in the air space near the magnetised surface such as that of a permanent magnet.
	www.magneticmining.com /separator_info.html (2261 words)

	Magnetic drum for separating ferrous and non-ferrous beverage containers - Patent 4557387
		The magnetic drum apparatus of claim 2 wherein said structural support means comprises a metal structural support for holding said magnetic means and altering magnetic flux lines generated by said magnetic field to hold said ferrous beverage containers on said outer surface of said outer cylindrical portion for said second predetermined distance.
		Non-ferrous materials drop vertically from the outer horizontal portion of the magnetic head pulley while the ferrous materials traverse around the circumference of the magnetic head pulley on the conveyor belt and are released from the conveyor belt after separation from the magnetic field of the magnetic head pulley.
		Magnetic force fields generated by the permanent magnets cause the ferrous beverage containers to be held against the outer cylindrical portion and cause the ferrous beverage containers to follow the rotational movement of the outer cylindrical portion so that they are transported a predetermined distance.
	www.freepatentsonline.com /4557387.html (3414 words)

	Magnetic drum
		Although the magnetic drum was once used as main (or primary) storage, it is now used as secondary (or auxiliary) storage.
		Magnetic drum storage devices consist of either a hollow cylinder (thus, the name drum) or a solid cylinder that rotates at a constant velocity (from 600 to 6,000 rpm).
		A magnetic drum differs from a magnetic disk in that the tracks in which the data is stored are assigned to channels located around the circumference of the drum as shown in figure 2-16.
	tpub.com /neets/book22/92d.htm (592 words)

	Permanent drum type magnetic separator manufacturer india
		The permanent Magnetic Drum consists of stationery permanent Magnetic assembly having uniform and everlasting Magnetic field across the entire width of the drum, which is effective over approximately half the drum circumferences as shown in fig.
		The permanent magnets used are everlasting magnets and its strength does not diminish during normal use and can be used through out the life of the installation.
		The magnetic separator with ceramic magnet are useful for the application where free and larger iron particles are to be separated.
	www.jkmagnetics.com /magneticseparator.html (496 words)

	Outokumpu - Inprosys® Wet Drum (Site not responding. Last check: 2007-10-22)
		Although a wet drum separator is not as strong as a maximum strength WHIMS (a matrix-type wet, high-intensity magnetic separator), it can be used to upgrade previous state-of-the-art drum separator applications which now require stronger magnetic forces.
		Magnetic forces matching or exceeding those of other medium strength drum separators are produced at a substantially lower cost.
		Drum diameters are presently 41 and 61 cm (16" and 24").
	www.outokumputechnology.com /pages/Page____8154.aspx (341 words)

	Magnetic drum storage for the track before detect system - Patent 4214239
		As the drum continues to rotate, clock pulses are read off the drum and cause the contents of shift register 16 to be shifted through a write head depending on the position of the "one" in shift register 18.
		The drum continues to rotate in synchronism with the antenna and the data is recorded on the same channel, sector by sector, until a complete revolution of the antenna and the drum is made.
		It is to be understood that the term magnetic drum as used throughout this disclosure may relate to either a drum, a magnetic tape in the form of a continuous loop or a magnetic disc and each would serve the same purpose.
	www.freepatentsonline.com /4214239.html (5733 words)

	Recycling Today Online :: Article :: Separation Supplement -- Magnetics — A Time Tested Separating Method
		Many magnetic drums are the older style non-agitating transfer design that uses a deep field radial pick-up magnet and pole shoes to convey or transfer ferrous around the drum shell to the discharge area.
		Most belt magnets have a hemispherical shaped magnetic field, stronger in the center and weaker at the edges, which is ideal for trough belt conveyors and aids in discharging the collected ferrous material.
		Magnetic head pulleys replace the drive pulley on a belt conveyor and are available in diameters of 8, 12, 15, 18, 20, 24, 30, 36, and 42 inches and belt widths from 8 inches to 72 inches.
	www.recyclingtoday.com /articles/article.asp?Id=3081 (2488 words)

	Outokumpu - Inprosys® Dry Drum
		Although a drum separator is not as strong as a maximum strength roll separator, it can be used to upgrade previous state-of-the-art drum separator applications, which now require stronger magnetic forces.
		In the Inprosys® Magnetic Dry Drum Separator, the yoke is not only adjustable with regards to the angular position, but the distance between the yoke and the shell can also be changed.
		For example, in the axial magnet yoke design, the smallest number of poles is 6 and, presently, the largest number is 22.
	www.outokumputechnology.com /pages/Page____8152.aspx (371 words)

	drum on Encyclopedia.com (Site not responding. Last check: 2007-10-22)
		The variety of tone and the volume of sound from a drum depend on the area, tension, and material of the membrane that is struck and, more particularly, on the skill of the player.
		The snare drum (sometimes called the side drum) also has a drumhead at either end; across one end are stretched gut strings wound with wire.
		Magnetic Drum Memory This magnetic drum unit was the memory in the IBM 650 computer, introduced in 1954.
	www.encyclopedia.com /html/d1/drum-mus.asp (813 words)

	ELEKTROMAG
		The magnetic drums for lifting procedure serve predominantly for the magnetic separation of ferrous from non-ferrous metals in the processing of scrap.
		The magnetic drum is equipped with a drum jacket made of non-magnetic abrasion resistant steel plates, with discharge strip and with lateral covers, made of light metal casting, with rotation supports - all these parts rotating around the magnetic system.
		The magnetic drum is held from the upright clamping supports.
	www.emagindia.com /pickup.htm (437 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The magnetic drum is based on a unique thin-shell construction, which results in a very light-weight assembly.
		The drum has a diameter of three inches, is three inches in length, and rotates at 6,000 rpm.
		Magnetic memory cores are made from powdered iron compounds and are threaded on wires to form core planes for computer storage devices.
	www.computinghistorymuseum.org /museum/old/first/redbook.html (1135 words)

	WPD Drum Separators (Site not responding. Last check: 2007-10-22)
		Wet drum separators are used in magnetic media recovery, purification of solids carried in liquid suspension, and iron ore concentration.
		Magnetic separators which recover magnetics contained in feed slurries as efficiently as possible, to reduce the per ton / media consumption of treated product to a minimum.
		The double drum WPD separators (available in double con-current arrangements or con-current primary with counter-current secondary arrangements) can either (1) give a higher magnetic recovery as compared to single drum units or (2) permit higher feed volumes while obtaining the same recovery as single drum separators.
	www.ohiomagnetics.com /wpd_drum.htm (601 words)

	Recycling Today Online :: Article :: Magnetic Equipment Guide -- Magnetic Separators Large Diameter Magnetic Drum ...
		The ferrous material jumps to the drum shell where the cleats move it through the magnetic field and discharge it at the end of the magnetic arc.
		The electro agitator drum magnet uses a deep field rectangular-core pick up magnet to reach out and grab the ferrous material, and a second rectangular-core agitator to flip or agitate the ferrous, cleaning it of contaminants like loose mud, paper, fluff, and trash.
		Many magnetic drums are the older style non-agitating transfer design that uses a deep field radial pick up magnet and pole shoes to convey or transfer ferrous material around the drum shell to the discharge area.
	www.recyclingtoday.com /articles/article.asp?Id=3575&SubCatID=56&CatID=12 (1405 words)

	PERMAX magnetic separator
		When magnetic particles in the slurry are introduced into the magnetising field produced by the magnet, they first align themselves with the lines of force.
		Magnetic particles attach themselves to the drum and are transported by the rotation of the drum, to a point outside of the influence of the magnetising field where, they are discharged into a chute.
		The feed magnetics concentration of 0,09g/l was reduced to 0,03g/l in the tailings at a flow rate of approximately 100m³/h metre.
	www.imsolution.com.au /permax-separator.html (2342 words)

	Magnetic Separators Industrial Magnets Permanent Magnets Electro Magnets Rare Earth Magnetic Separators
		comprised of a stationary permanent magnet enclosed in a non-magnetic stainless-steel drum.
		Drum Separators can be provided as the drum only or as a complete assembly with the housing and drive included.
		Magnetic chute separators are ideal for extracting ferrous tramp metal from high-volumes of dry product flowing vertically through a chute.
	www.ipesmag.com /product.html (447 words)

	Storch Magnetics - magnetic separator, detection inline metal, coolant filter, metal detection, magnetic product, scrap ...
		Magnetic Separator Plates easily mount to your chutes, sloped trays and may be used on vibrating transporter conveyor trays.
		Magnetic Materials are fully magnetized to 100% saturation, and configured in standard 2 pole or available 3, 4, and 6 polarity optimized circuits to pull, capture and provide tramp metal removal.
		Ferrous metals are magnetically pulled out of your non-ferrous conveyed materials; ferrous materials collect on the self cleaning magnetic separator belt and are conveyed and discharged to your hopper.
	www.thomasregister.com /olc/62539002/sep2_1.htm (547 words)

	IBM 650 Magnetic Drum Calculator Introduced in 1953
		The IBM 650 Magnetic Drum Calculator was notable for its high-speed magnetic storage drum permitting rapid access to data.
		Magnetic drum storage was supplemented by magnetic disc storage with the IBM 305 RAMAC in 1956.
		Magnetic disc storage ultimately prevailed for the same reason- the inefficient wasted space inside a drum.
	www.cedmagic.com /history/ibm-650-drum.html (136 words)

	Manchester Drums
		The role of this first drum built wholly in the department came to an end with the delivery of a beautifully machined replica built by Ferranti for the further development of the recording heads and experimentation with the magnetic surfaces.
		The depth of the drum of 2'' was governed by the need to achieve sufficiently small clearance between the recording heads and the recording surface over its full extent.
		It was through use of these components that by October of 1949 the Manchester Mark1 had access to two magnetic drums each with 32 tracks (two blocks of 16 heads per drum) providing an effective intermediate store of 128 pages, 16 times the capacity of the random access CRT store of eight pages.
	www.computer50.org /mark1/gethomas/manchester_drums.html (913 words)

	Byer Magnetic Drum Recorder (Site not responding. Last check: 2007-10-22)
		The only documentary evidence I have of magnetic drum recorder manufacture in Australia is a paper published in the Proceedings of the IRE Australia, titled "Modern Magnetic Recording Techniques" by M.W. Johnson, Nov 1962.
		This shows the magnetic drum which is on a lead screw and as it rotates the drum is driven upward so the magnetic head traces out a spiral path on the drum.
		Just before the useful magnetic material looses contact with the head a limit switch operates and the lead screw is released allowing gravity to cause the drum to drop to the starting point.
	users.chariot.net.au /~debpeter/Byer_Drum.html (410 words)

	ipedia.com: Computer storage Article (Site not responding. Last check: 2007-10-22)
		Historically, "memory" referred to "magnetic core memory" in the 1950s, and then to semiconductor-based storage in the 1970s, at a time when the fastest response times were for magnetic core, and then for semiconductor memory, respectively.
		Semiconductor memory (RAM) and magnetic disk are examples of this type of storage.
		Magnetic tape and certain types of flash memory have this property.
	www.ipedia.com /computer_storage_1.html (536 words)

	Drum memory : Magnetic drum (Site not responding. Last check: 2007-10-22)
		For many machines a drum formed the main working memory of the machine, with data and programs being loaded onto or off the drum using media like paper tape or punch cards.
		Drums were later replaced by core memory, which was even faster and had no moving parts.
		It uses material from the wikipedia article Drum memory : Magnetic drum.
	www.eurofreehost.com /ma/Magnetic_drum.html (423 words)

	NS Magnetic Drum Brake (Site not responding. Last check: 2007-10-22)
		The OHMIC Controls, Australian made, Type NS Magnetic Drum Brake is a spring applied A.C. brake, compact in design, suitable for continuous duty, and suitable for connection to any A.C. supply up to 500 Volts 25 to 60 Hz.
		The brake is manufactured in three sizes to suit 102, 140 and 178mm brake drum diameter and provides a torque of up to 13.5, 34 and 68 N-m respectively.
		OHMIC Controls Type NS Magnetic Drum Brakes can be used on machine tools, conveyors, roller doors, long travel and cross traverse of cranes and similar applications where a dependable brake is required.
	www.ohmic.com.au /brakes.html (170 words)

	Magnet Drum Separators
		Stearns Type LD Drum Separators are the magnetic answer to heavy industrial applications such as tramp iron removal, slag treatment, ore cobbing and scrap fragmentizing.
		The LD Drum consists of an electromagnetic assembly mounted inside an outer rotating drum assembly.
		Stearns' Ceramic 8 Drum Separator provides automatic and continuous removal of tramp in process industries such as chemicals, plastics, ceramics, rubber, grain, foods, tobacco, minerals and elsewhere, wherever granular or pulverized materials are conveyed in closed chutes or spouts.
	www.ohiomagnetics.com /magnet_drum.htm (900 words)

	Drum Type Magnetic Separator - Sonal Magnetics - manufacturers and suppliers of magnetic materials
		Drum Type Magnetic Separator, Sonal Magnetics based in Ahmedabad, Gujarat, is one of the biggest and leading company in the Manufacturing of permenent magnetic Equipments, Rare earth Equipments and All type of Magnetic Appliences
		Its rugged construction is ideal for separating ferrous metal from material such as shredded cars, slag, crushed ore and ash at mass burn plants, in foundries recycling plastic, aluminuium and glass.
		Ferrous metal is magnetically drawn out of the material feed, held against the revolving shell, and released when it reaches a discharge point beyond the magnetic field
	www.sonalmagnetics.com /Drum_Separator.htm (193 words)

	p24 (Site not responding. Last check: 2007-10-22)
		The drum was 5 inches in diameter and revolved at 3000 rpm, recording at a density of 230 bits per inch with a rigid head mounted only.001 inch from the surface of the drum.
		Howard Aiken at Harvard was also experimenting with a magnetic drum on the Mark II computer in 1947, and he would make the drum the key feature of his improved Mark III computer in 1948.
		The access speed and large capacity of magnetic drums exceeded all other forms of computer memory in use during the decade after World War II, such as the CRT and the mercury delay line.
	history.acusd.edu /gen/recording/mag/p24.html (398 words)

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