View source for William Joseph Hammer

{{Short description|American engineer}}
[[File:William Joseph Hammer in 1881.jpg|thumb|William Joseph Hammer in 1881]]
[[File:Portrait of William J. Hammer. (12d576736fe34954b2871b5c9fbfa0ea).jpg|thumb|right|William Joseph Hammer in 1919]]
'''William Joseph Hammer''' (February 26, 1858 – March 24, 1934) was an American pioneer [[electrical engineer]], aviator, and president of the [[Edison Pioneers]].
==Biography==
He was born in [[Cressona, Pennsylvania]] on February 26, 1858 to William Hammer (1827–1895) and Martha Augusta Beck (1827–1861).<ref name=obit/><ref name=dr/>
He became a laboratory assistant to [[Thomas Edison]] in December 1879, and assisted in the development of the  [[incandescent light bulb]].<ref name="Kahn">{{Cite book |last=Kahn |first=Mark |title=William J. Hammer Collection |date=November 11, 2011 |location=National Air and Space Archives, Accession No. XXXX-0074 |pages=1–3}}</ref> He became one of the world's earliest experts in electric power distribution. He also built the world's first advertising sign using incandescent electric lights.<ref>Tell, Darcy "Times Square spectacular: lighting up Broadway," Smithsonian Books in association with Harper Collins, 2007. Page 35. {{ISBN|978-0-06-088433-8}}.</ref> He was chief engineer when the English Edison Electric Light company built a central station in London to power 3,000 incandescent lamps on the [[Holborn Viaduct]]. This was the first large scale demonstration of a central station powering incandescent lighting, preceding the [[Pearl Street Station]] in New York City.<ref>{{Cite book |last=Bryan |first=George S. |title=Edison: The man and his work |publisher=[[Alfred A. Knopf]] |year=1926 |pages=158}}</ref> Hammer invented the electric advertising sign, by constructing a ten foot long, four foot high sign with 12 bulbs for each letter of the name "Edison," which had a rotating drum switch  to light the letters one by one and then all at once.  It was exhibited at [[The Crystal Palace]] in London in February 1882.<ref>Stross, Randall "The wizard of Menlo Park," Crown Publishing, 2001, page 128. {{ISBN|978-1-4000-4762-8}}.</ref>
He collected examples of the Edison lamp at various stages of development, as well as pioneering incandescent lamps by other inventors.  The collection eventually was purchased by [[General Electric]] placed in the [[Greenfield Village Museum]], established by [[Henry Ford]].<ref>{{Cite book |last=Bryan |first=Ford Richardson |url=https://books.google.com/books?id=EPIuXHxLJRgC&dq=%22william+j+hammer%22+aviation&pg=PA297 |title=Henry's Attic: Some Fascinating Gifts to Henry Ford and His Museum |date=1995 |publisher=Wayne State University Press |isbn=978-0-8143-2642-8 |language=en}}</ref>
He was a promoter of [[radium]], after [[Marie Curie|Marie]] and [[Pierre Curie]] gave him samples in 1902. He gave lectures on its properties and discussed its purported curative powers, as well as writing a book based on his lectures and demonstrations of radium and luminous and [[phosphorescent]] substances.<ref>Hammer, William Joseph "Radium, and other radio-active substances: polonium, actinium, and thorium, D. Van Nostrand Company, 1903. Retrieved November 11, 2011</ref><ref>{{Cite book |last=Quinn |first=Susan |title=Marie Curie: a life |publisher=Da Capo Press |year=1996 |isbn=978-0-201-88794-5 |pages=196 |language=English}}</ref> He was the first to propose Radium as a treatment for cancer.<ref name="Gross">{{Cite book |last=Gross |first=Ernie |url=https://books.google.com/books?id=tQ9eEattl4MC&dq=%22william+j+hammer%22+radium&pg=PA70 |title=This Day in American History |date=1990 |publisher=VNR AG |isbn=978-1-55570-046-1 |language=en}}</ref> In 1903, he and Dr. Willy Meyer used radium to treat an incurable tumor, and it was observed to shrink and become less painful, though the patient was not cured.<ref>{{Cite book |url=https://books.google.com/books?id=9j8iAQAAMAAJ&dq=%22william+j+hammer%22+cancer&pg=PA23315 |title=Scientific American: Supplement |date=1903 |publisher=Munn and Company |language=en}}</ref> He invented the [[Radioluminescence|luminous]] [[Radium dials|Radium dial]] for  watches and other instruments, widely used in World War 1 and thereafter.<ref name=Gross/>
Hammer was an early promoter of aviation, and an associate of many of the aviation pioneers,  and testified as an expert.<ref name=Kahn/>
He authored the book ''[[Radium, and other radioactive substances]]''.
He died of pneumonia on March 24, 1934 in [[New York City]].<ref name=obit>{{cite news |title=Maj. Hammer Dies. An Edison Pioneer. Won Distinction as Engineer, Scientist and General Staff Officer in War |url=https://www.nytimes.com/1934/03/25/archives/maj-hammer-dies-an-edison-pioneer-won-distinction-as-engineer.html |quote=Major William J. Hammer, USA, retired, engineer, scientist and World War ... He was president of the Edison Pioneers in 1908 ... |newspaper=[[New York Times]] |date=March 25, 1934 |access-date=2011-11-08 }}</ref><ref name=dr>{{cite web |url=http://www.drbronsontours.com/bronsonwilliamhammer.html |title=William Joseph Hammer |access-date=2011-11-08 }}</ref> Whether or not his death had any connection with radium is to this day unclear.
==Discoveries==
While working for the inventor Thomas Edison at Edison's laboratory in Menlo Park, New Jersey, Hammer was in charge of testing early electric light globes in 1880 through 1881. In 1881, he made an accidental discovery that turned out to be of great importance.
At the time, Edison was attempting to produce a reliable and commercial electric light bulb. The essence of his idea was that a filament would glow within a glass envelope from which the air had been evacuated when electrically energized with direct current (DC). The exclusion of air was essential to maximize the life of the filament. Edison had chosen a carbonized (burned) bamboo filament for his new lamp, but this solution was not perfect. After being heated to incandescence for a few hours, carbon from the filament would be deposited on the inside walls of the bulb, turning it black.
Hammer noticed the carbon seemed to be coming from the end of the filament that was attached to the negative terminal of the DC power supply, and seemed to be flying through the vacuum onto the walls of the bulb, a phenomenon that Edison observed in 1875. On February 13, 1880, Edison determined that not only was carbon flying through the vacuum, but that it carried a charge. That is, electricity was flowing not only through the filament but also through the evacuated bulb, a phenomenon initially reported in 1873 by Frederick Guthrie in Britain. In order to measure this flow, he made a special bulb with a third electrode, to which he could attach an instrument to measure the current. He reasoned that if the current would flow between the two ends of the filament, it would also flow to this third electrode. While he was proven to be right about the current flow, Edison could not explain it, and the third electrode did not prevent blackening of the bulb, so he moved on to other experiments. But he did patent the new device, because he believed that it might have some commercial applications, such as measuring electric current.
Hammer found that under certain conditions of vacuum and voltage he observed a blue glow around the positive pole in a vacuum bulb and a blackening of the wire and the inside of the glass bulb at the positive pole. Hammer's discovery was first called "Hammer's Phantom Shadow," but when Edison patented the electric light bulb in 1883 this [[thermionic emission]] became known as the "Edison Effect," and was patented on November 15, 1883 (U.S. patent 307,031).<ref>{{Cite web |title=Error Page |url=https://edison.rutgers.edu/error-page |access-date=2024-01-28 |website=edison.rutgers.edu}}</ref><ref>{{Cite web|url=https://patents.google.com/patent/US307031A/en|title=Thomas a|access-date=August 11, 2019}}</ref>
When the bulb's filament is heated white-hot, electrons are boiled off its surface and into the vacuum inside the bulb. If the extra electrode (also called a "plate" or "anode") is made more positive than the hot filament, a direct current flows through the vacuum. And since the extra electrode is cold and the filament is hot, this current can only flow from the filament to the electrode, not the other way. So, alternating current (AC) signals can be converted into DC, or rectified. Hammer noted the rectifier effect when he added the third electrode to a heated filament light bulb.
In September 1884, British scientist William Preece took back with him several of the Edison effect bulbs. He presented a paper on them in 1885, where he referred to thermionic emission as the "Edison Effect."<ref>{{Cite book|url=https://books.google.com/books?id=ebr_AwAAQBAJ&q=fleming+edison+effect&pg=PA209|title=The Continuous Wave: Technology and American Radio, 1900-1932|first=Hugh G. J.|last=Aitken|date=July 14, 2014|publisher=Princeton University Press|isbn=9781400854608|access-date=August 11, 2019|via=Google Books}}</ref> The British physicist John Ambrose Fleming, who in 1882 had accepted a consulting position for the Edison & Swan Electric Light Company of London, discovered in 1885 that the Edison Effect could be used to detect radio waves. Fleming went on to develop the two-element vacuum tube known as the diode, which he patented on November 16, 1904.<ref>{{Cite web|url=http://www.directorypatent.com/GB/190424850-a.html|title=Directorypatent.com Is For Sale|website=www.directorypatent.com|access-date=August 11, 2019}}</ref><ref>{{Cite web|url=https://patents.google.com/patent/US803684A/en|title=Instrument for converting alternating electric currents into continuous currents.|access-date=August 11, 2019}}</ref> After further investigation while working for the Marconi Wireless Telegraph Co., Ltd., Fleming patented the Fleming Valve rectifier in 1904, resulting in the electron tube becoming the basis of modern electronics.
==In popular culture==
[[Ruth Plumly Thompson]], author of the "Oz books" after [[L. Frank Baum]] died, made some references to Hammer in a fantasy context. An electrical device in ''[[The Cowardly Lion of Oz]]'' (1923) is credited by its owner to an otherwise unexplained "Uncle Billy". A note on the title page of ''[[Grampa in Oz]]'' (1924) reads: "This book is dedicated, with deep affection, to Uncle Billy (Major William J. Hammer), author, inventor and second cousin to Santa Claus." A character in ''[[The Yellow Knight of Oz]]'' (1930) and ''[[Speedy in Oz]]'' (1934) is an eccentric inventor named William J. Harmsted.
== See also ==
* [[Hammer Historical Collection of Incandescent Electric Lamps]]
==References==
{{reflist}}
==External links==
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*[https://ancexplorer.army.mil/publicwmv/#/arlington-national/search/results/1/CgZIYW1tZXISB1dpbGxpYW0-/ Arlington National Cemetery]
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{{DEFAULTSORT:Hammer, William Joseph}}
[[Category:1858 births]]
[[Category:1934 deaths]]
[[Category:People from Schuylkill County, Pennsylvania]]
[[Category:American electrical engineers]]
[[Category:Burials at Arlington National Cemetery]]
[[Category:Edison Pioneers]]