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No. 219, some additional experiments, comparing the power of a cast-iron (or
Maynooth) battery with that of a Grove's of equal size." Some previous batteries had used rare metals such as platinum or unresponsive materials like carbon and zinc. Callan found that he could use inexpensive cast-iron instead of platinum or carbon. For his Maynooth battery, he used iron casting for the outer casing and placed a zinc plate in a porous pot (a pot that had an inside and outside chamber for holding two different types of acid) in the centre. Using a single fluid cell he disposed of the porous pot and two different fluids. He was able to build a battery with just a single solution.
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409:. Callan had induced a high voltage in the second wire, starting with a low voltage in the adjacent first wire. And the faster he interrupted the current, the bigger the spark. In 1837 he produced his giant induction machine: using a mechanism from a clock to interrupt the current 20 times a second, it generated 15-inch (380 mm) sparks, an estimated 60,000 volts and the largest artificial bolt of electricity then seen.
429:), which used over 30 gallons of acid. Since instruments for measuring current or voltages had not yet been invented, Callan measured the strength of a battery by measuring how much weight his electromagnet could lift when powered by the battery. Using his giant battery, Callan's electromagnet lifted 2 tons. The Maynooth battery went into commercial production in London. Callan also discovered an early form of
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beginning of the first coil to the beginning of the second. Finally, he connected a battery, much smaller than the enormous contrivance just described, to the beginning and end of the winding one. He found that when the battery contact was broken, a shock could be felt between the first terminal of the first coil and the second terminal of the second coil.
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until 1997, was named in his honour. In addition, Callan Hall in the south campus, was used through the 1990s for first-year science lectures including experimental & mathematical physics, chemistry and biology. The
Nicholas Callan Memorial Prize is an annual prize awarded to the best final-year
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published in 1849, has an article titled "The
Maynooth Battery" which begins "We noticed this new and cheap Voltaic Battery in the Year-book of Facts, 1848, p. 14,5. The inventor, the Rev. D. Callan, Professor of Natural Philosophy in Maynooth College, has communicated to the Philosophical Magazine,
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Further experimentation showed how the coil device could bring the shock from a small battery up to the strength level of a big battery. So, Callan tried making a bigger coil. With a battery of only 14 seven-inch (178 mm) plates, the device produced power enough for an electric shock "so strong
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Callan, Nicholas, "A means of protecting iron of every kind against the action of the weather and of various corroding substances so that iron thus protected will answer for roofing, cisterns, baths, gutters, pipes, window-frames, telegraph-wires for marine and various other purposes," British
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Callan invented the induction coil because he needed to generate a higher level of electricity than currently available. He took a bar of soft iron, about 2 feet (0.61 m) long, and wrapped it around with two lengths of copper wire, each about 200 feet (61 m) long. Callan connected the
378:). Wound on top of this is a secondary coil made up of many turns of thin wire. An iron armature and make-and-break mechanism repeatedly interrupts the current to the primary coil, producing a high-voltage, rapidly alternating current in the secondary circuit.
552:"A description of an electromagnetic repeater, or of a machine by which the connection between the voltaic battery and the helix of an electromagnet may be broken and renewed several thousand times in the space of one minute,"
405:). Because of the action of the interrupter, which could make and break the current going into the coil, he called his device the "repeater." Actually, this device was the world's first
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While experimenting with batteries, Callan also built the world's largest battery at that time. To construct this battery, he joined 577 individual batteries (
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Callan experimented with designing batteries after he found the models available to him at the time to be insufficient for research in electromagnetism.
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that a person who took it felt the effects of it for several days". Callan thought of his creation as a kind of
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to protect iron from rusting when he was experimenting on battery design, and he patented the idea.
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Reville, William. Nicholas Callan: Priest
Scientist at Maynooth. The Irish Times, 21 February 2002.
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in 1834. He invented the first induction coil in 1836. An induction coil produces an intermittent
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in 1826. While in Rome he became acquainted with the work of the pioneers in electricity such as
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supply. It has a primary coil consisting of a few turns of thick wire wound around an
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He died in 1864 and is buried in the cemetery in St. Patrick's
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M.T. Casey (December 1985) "Nicholas Callan – priest, professor and scientist,"
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patent no. 2340 (filed: 12 October 1853; issued: 25 November 1853). See:
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that consisted of a rocking wire that repeatedly dipped into a small cup of
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seminary. He entered
Maynooth College in 1816. In his third year at
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The Year-book of Facts in
Science and Art (p.156), 1849, John Timbs
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640:"On the construction and power of a new form of Galvanic battery,"
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Callan was ordained a priest in 1823 and went to Rome to study at
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Callan's
Induction Coil at the National Science Museum, Maynooth
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313:(1745–1827) who is known especially for the development of the
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Stanley A. Czarnik (March 1992) "The classic induction coil,"
282:, Callan studied natural and experimental philosophy under
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Callan, N.J. (December 1836) "On a new
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and Mass server, and saw him start the priesthood at
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578:"The Classic Induction Coil, Induction, Coils, HV"
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230:(22 December 1799 – 10 January 1864) was an Irish
250:from 1834, and is best known for his work on the
374:and subjected to a low voltage (usually from a
660:http://eprints.nuim.ie/1767/1/CaseyCallan.pdf
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500:A Dictionary of Irish Biography, 3rd Edition
765:Academics of St Patrick's College, Maynooth
444:The Callan Building on the north campus of
413:The 'Maynooth Battery' and other inventions
645:, series 3, vol. 33, no. 219, pages 49–53.
502:. Dublin: Gill and MacMillan. p. 55.
419:The Year-book of Facts in Science and Art,
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775:19th-century Irish Roman Catholic priests
770:Alumni of St Patrick's College, Maynooth
558:, vol. 1, pages 229–230 and Fig. 52 on
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355:, Callan began work on the idea of the
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790:Burials at Maynooth College Cemetery
695:Callan, Nicholas Joseph (1799–1864)
800:Sapienza University of Rome alumni
780:Christian clergy from County Louth
701:Biography at corrosion-doctors.org
476:List of Catholic clergy scientists
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453:student in Experimental Physics.
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305:(1737–1798) who was a pioneer in
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606:"Who Invented the Transformer?"
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498:Boylan, Henry (1998).
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299:doctorate in divinity
185:Ecclesiastical career
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450:St Patrick's College
795:People from Dundalk
573:Popular Electronics
366:from a low-voltage
364:alternating current
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116:Sapienza University
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739:Categories
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372:iron core
288:magnetism
272:altar boy
232:physicist
102:, Ireland
723:LibriVox
588:22 April
560:page 522
539:page 477
470:See also
280:Maynooth
210:Ordained
190:Religion
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427:"cells"
399:mercury
376:battery
323:physics
264:Dundalk
70:Dundalk
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440:Legacy
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617:2019
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