Niels Bohr

Danish physicist and Nobel prize laureate, 1885-1962

Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid. He conceived the principle of complementarity: that items could be separately analysed in terms of contradictory properties, like behaving as a wave or a stream of particles. The notion of complementarity dominated Bohr's thinking in both science and philosophy.

Source: Wikipedia

Bohr, Niels

physicist and Nobel Laureate (1885-1962). Signed photograph. no place; no date. 3.25 x 5 inch.
$ 3,543 / 3.000 € (83488)

Rare matte black and white photograph of Bohr in a head and shoulders pose with white border. Signed in blue ink, "Niels Bohr." Niels Bohr (1885-1962) was a Danish physicist. He received the Nobel Prize for Physics in 1922 for his work applying the quantum concept to the problem of atomic and molecular structure. Forced to flee Denmark after the Nazi occupation in 1943, he settled in Sweden briefly before moving to London. Bohr worked at Los Alamos on the Manhattan Project under the pseudonym Nicholas Baker and spent the next two years flying between London, Washington and Los Alamos.

He recognized early on how their work would complicate international relations and thus, spent the rest of his life advocating for passive applications of atomic energy..

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Bohr, Niels

Physiker (1885-1962). Typed letter signed. Kopenhagen. 1 S. 4to. Beiliegend ein Kuvert mit roten Lacksiegeln des Instituts.
$ 2,953 / 2.500 € (49379/BN33757)

To the Austrian physicist Heinrich Mache at the Vienna University of Technology, thanking for a collection of rare-earth elements which the Austrian scientist Carl Auer von Welsbach had donated, and sending 500 Danish Crowns to support the University's scientific projects. - On stationery with printed letterhead of the Universitetets Institut for Teoretisk Fysik. Traces of folds.

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Bohr, Niels

dänischer Physiker, Nobelpreisträger; schuf die Grundlage der modernen Atomphysik (1885-1962). Eigenhändiger Brief mit Unterschrift. Kopenhagen. Gr.-8vo. 1 p. Gedr. Adresse. Mit eigenh. beschrifteten Kuvert.
$ 2,126 / 1.800 € (83494)

An Ashley T. Cole in New York. „I thank you for your kind note with the interesting information about your collection of autograph letters.“ Niels Bohr Autograph Letter Signed. One page, 6.25" x 7.75", no place; July 30, 1952. This brief letter, sent to Mr. Ashley T. Cole, reads in full: "I thank you for your kind note with the interesting information about your collection of autograph letters." Signed, "Niels Bohr." Niels Bohr (1885-1962) was a Danish physicist. He received the Nobel Prize for Physics in 1922 for his work applying the quantum concept to the problem of atomic and molecular structure.

Forced to flee Denmark after the Nazi occupation in 1943, he settled in Sweden briefly before moving to London. Bohr worked at Los Alamos on the Manhattan Project under the pseudonym Nicholas Baker and spent the next two years flying between London, Washington and Los Alamos. Bohr recognized early on how their work would complicate international relations and thus, spent the rest of his life advocating for passive applications of atomic energy. Uniformly toned with smoothed crease..

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Bohr, Niels

Ms. Brief mit eigenh. U.
Autograph ist nicht mehr verfügbar

Letter to the publisher W. Keiper in Berlin. In part (translated): “I have your friendly letter asking if I was satisfied with the proposed dedication in your edition of Planck's recollections. It is hard for me to answer the question posed, because it seems to me that a dedication to certain organizations or persons hardly projects the paramount importance of Planck's life work to the science of our time. Anyway, I might like to know, on the one hand, if you have already received from the Nobel Foundation and other named persons the approval of the dedication and it would therefore be associated with difficulties…On the other hand, after the eight names among the many [Nobel] award-winners for Physics selected, you omit entirely others such as Compton, Dirac, Fermi, Franck, Pauli, Rabi, Stern, from whom so many significant contributions to the Planck quantum theory have come.” Intersecting folds, a few significant stains affecting the overall appearance, and punch holes to the left edge, otherwise fine condition. Fabulous content associating several of the most influential figures in the development of quantum theory.


Bohr, Niels

Brief m. e. U.
Autograph ist nicht mehr verfügbar

Niels Bohr (1885-1962), Physiker, Nobelpreisträger; einer der bedeutendsten Atomphysiker des 20. Jahrhunderts, schuf mit seinem Atommodell die Grundlage der modernen Atomphysik. Brief m. e. U., Kopenhagen, 16. Juli 1920, 1 ½ Seiten gr.-4°. Gelocht; das 2. Blatt mit kleinem Faltenschaden. An den Physiker Rudolf Ladenburg „über die Konstitution der Atome der Elemente“: „[…] Die Schwierigkeiten des Problems liegen besonders in der rationellen Verwertung der verschiedenen vorgeschlagenen Elektronkonfigurationen auf die Erklärung der chemischen Eigenschaften der betreffenden Elemente […] Ausser der Schwierigkeiten, die […] die Annahme von Elektronringe mit sich bringt für eine Erklärung der Eigenschaften der Krystalle, Bandenspektra, Ionisationspotentiale u.s.w., scheint es auch, dass eine Annahme von Ringe schon wegen der ungenügende Stabilität zu verlassen ist, und dass wir gezwungen sind mit viel verwickelter Bewegungen der Elektronen im Atom zu rechnen […] Was Ihre spezielle Frage nach der Konstitution der Atome der Edelgase anbelangt, glaube ich, dass derartige Betrachtungen wie die Kossel’schen vielleicht nicht so schwerwiegende Argumente beibringen, wie man beim ersten Blick geneigt wäre zu glauben […]“ – Im folgenden Jahr lieferte Bohr seine Erklärung für den Aufbau des periodischen Systems der Elemente, indem er die Atomhülle als aus Elektronenschalen aufgebaut darstellte. – So inhaltsreiche Briefe Bohrs sind äußerst selten.


Bohr, Niels

The Penetration of Atomic Particles through Matter. Signed and Inscribed, "Professor H[elmut L.] Bradt / with kind regards," on the title-page at upper edge. 144 pages, printed wrappers, "H.L. Bradt / 1949" penciled in Bradt's hand at upper right of front
Autograph ist nicht mehr verfügbar


Bohr, Niels

Ms. Brief mit eigenh. Unterschrift.
Autograph ist nicht mehr verfügbar

Letter to "Architect Jensen", thanking him for flowers and congratulations on his 50th birthday. In part (translated from the Danish original): "My wife and I were so looking forward to setting up our summer home in Klintebjerg, based on your beautiful plans, and we are sorry that the circumstances meant that the execution of these plans had to be abandoned". - In fine condition.