hahn printing (14 risultati)

paperback. Condizione: Fair. N/A (illustratore).

Paperback. Condizione: Good. N/A (illustratore). First Edition. It's a preowned item in good condition and includes all the pages. It may have some general signs of wear and tear, such as markings, highlighting, slight damage to the cover, minimal wear to the binding, etc., but they will not affect the overall reading experience.

Paperback. Condizione: Very Good. No Jacket. N/A (illustratore). May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

Paperback. Condizione: Very Good. No Jacket. N/A (illustratore). May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

Paperback. Condizione: Fair. No Jacket. N/A (illustratore). Readable copy. Pages may have considerable notes/highlighting. ~ ThriftBooks: Read More, Spend Less.

Paperback. Condizione: Very Good. No Jacket. N/A (illustratore). May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

Paperback. Condizione: Very Good. No Jacket. N/A (illustratore). May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less.

Condizione: Good. N/A (illustratore). Used book that is in clean, average condition without any missing pages.

paperback. Condizione: Very Good. N/A (illustratore). Connecting readers with great books since 1972! Used books may not include companion materials, and may have some shelf wear or limited writing. We ship orders daily and Customer Service is our top priority!

Paperback. Condizione: Good. N/A (illustratore). Connecting readers with great books since 1972! Used textbooks may not include companion materials such as access codes, etc. May have some wear or writing/highlighting. We ship orders daily and Customer Service is our top priority!

Trade Paperback. Condizione: Very Good. N/A (illustratore). 1st Edition. 1st printing. text clean and unmarked. binding tight. covers have light wear. edges of pages have light wear.

paperback. Condizione: New. N/A (illustratore). In shrink wrap. Looks like an interesting title!

Soft cover. Condizione: Good. HAHN, Otto and STRASSMANN, Fritz. "Uber den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle" ("On the detection and characteristics of the alkaline earth metals formed by neutron irradiation of uranium.") In: Die Naturwissenschaften, vol. 27. 1939, 1 January, first issue of the new year. Berlin, J. Springer, 1939. 27x20cm. "In 1938 Hahn and Strassmann had demonstrated the presence of radioactive barium, lanthanum and cerium among the products of neutron bombardment of uranium, an observation that seemed to contradict all previous experiences of nuclear physics. The two men announced their puzzling findings in a paper, 'Ueber den Nachweis und das Verhalten.', published in 'Naturwissenschaften' on 6 January 1939" --(Norman Catalog).  See also PMM 422 (b) [++] The papers include: "Uber den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle , pp11-15. (AND) "Nachweis der Entstehung aktiver Bariumisotope aus Uran und Thorium durch Neutronenbestrahlung; Nachweis weiterer aktiver Bruchstücke bei der Uranspaltung, pp89-95. (AND)"Uber die Bruchstücke beim Zerplatzen des Urans" 163-164. (AND) "Zur Frage nach der Existenz der Trans-Urane, pp451-453. (AND) "Weitere Spaltprodukte aus der Bestrahlung des Urans mit Neutronen", pp529-534. (AND) "Uber einige Bruchstücke beim Zerplatzen des Thoriums" 544-547 (with S. Flugge). All are disbound from a larger bound volume and are in nice condition, offered in the full weekly issue. [++] The 1939 paper by Otto Hahn and Fritz Strassmann, published in Naturwissenschaften, is one of the most historically significant scientific papers of the 20th century reporting on the discovery of nuclear fission. Hahn and Strassmann had been bombarding uranium (U) with neutrons, expecting to produce elements heavier than uranium (transuranic elements). Instead, their chemical analysis revealed the presence of barium (Ba) an element with about half the atomic mass of uranium.

Soft cover. Condizione: Fine. Beschreibung einer Rechnungs-Maschine, wodurch man ohne Muhe, durch blose Herumfuhrung eines Triebels, die vier gewohnlichen Rechnungs-Arten verrichten kann. (Description of a calculating machine, whereby one can perform the four usual types of calculation without effort, simply by moving a pinion around.) In: Der Teutsche Merkur, Weimar, 1779, edited by C. M. Wieland. Section 5, pp 97-192. 178x117mm. Original wrappers. This single issue of the Teuscher Merkur has been beautifully restored and intricately rebacked just a lovely job. The issue itself is FINE, with only occasional foxing. The text and wrappers are crisp; this is just a joyful copy. The issue is housed in a newly-made, custom clamshell box of calf-backed boards with a paper label. The box is new and of high quality. Superb copy. [++] Philipp Matthäus Hahn (1739-1790), known as the "Priestermechaniker (priest mechanic)") was a German pastor, astronomer, clockmaker, and inventor of tremendous quality. He is also famous for his four-function fully-working stepped-roller calculating machine, of which the good Parson and his mechanics made five or six. [++] First printing of the announcement and description of the first fully functioning four-function (addition, subtraction, division, multiplication) calculator. "The First Functional Calculator"--edtechmagazine only (Hahn). (The first successful commercially produced mechanical calculator would come about 40 years later with the introduction of the Arithmometer.) [++] This instrument was developed from about 1773/4, with Hahn finally publishing a description of the cylindrical brass, iron, and enamel machine and how it functioned in the Tesucher Merkur [the issue offered here] in 1779. [++] The famous calculator created by Leibniz in the 1670's using the stepped roller--later employed by Hahn--though the original Leibniz machines didn't really function properly. The four-function Hahn calculator was also preceded by the work of Anton Brown and Jacob Leupold (though Hahn may not have known of their work), and their work remained very largely unknown and obscure, unlike the success and visibility achieved by Hahn. [++] "Special consideration deserves the Parson Phillip Mathieus Hahn who developed in 1773 the first functional calculator based on Leibniz's Stepped Drum. Hahn's calculator had a set of 12 drums in a circular arrangement actuated by a crank located in the axis of the arrangement. Hahn made these machines until his death in 1790, however, his two sons and his brother-in-law, Johann Christopher Schuster, continued with the manufacture probably as late as 1820."--Redin, A Brief History of Mechanical Calculators (online). [++] "In an article in the magazine Teutschen Merkur from 1779, Hahn mentioned his inspiration: When my time was occupied with making astronomical clocks, I had to deal with calculations of long fractions, multiplication, and division of large numbers, and I was so overwhelmed, that my primary work was close to being stopped. Then I recalled that some time ago I read a book for Leibniz, which mentioned his calculating machine, for which he spent a lot of money, without satisfactory results. I decided to spare some time in this direction. Certainly, I also wasted much time and money experimenting and troubleshooting the construction of my device. Finally, I managed to construct a rather advanced and reliable machine. Most difficulties I met during the construction of the tens carrying mechanism." Also: "During the rotation of the mechanisms of the machine by means of the handle in the middle of the lid, a stepped drum will be engaged with the wheel of the main counter, which is also attached to vertical axes, and according to the vertical position of the appropriate stepped drum, the wheel will be rotated to 0, 1, , 9 teeth.The dials are graduated with two scales."--My Time Machines (online) (Write for more detail).