Read e-book online A Mapmaker's Dream: The Meditations of Fra Mauro, PDF

By James Cowan

ISBN-10: 1590305205

ISBN-13: 9781590305201

In sixteenth-century Venice, in an island monastery, a cloistered monk reviews the journey of a lifetime—all in the confines of his cellphone. half historic fiction, half philosophical secret, A Mapmaker's Dream tells the tale of Fra Mauro and his fight to gain his life's paintings: to make an ideal map—one that represents the complete breadth of production. information of Mauro's initiatives draws explorers, pilgrims, tourists, and retailers, all desirous to give a contribution their money owed of far flung humans and locations. As he listens to the stories of the unusual and marvelous issues they have visible, Mauro involves regard the realm as even more than continents and kingdoms: that it's also made from an unlimited and both genuine inside panorama of ideals, aspirations, and desires. Mauro's map grows and takes form, changing into either extra entire and incomprehensible. within the procedure, the limits of Mauro's global are driven to the extraordinary, elevating questions on the connection among illustration, mind's eye, and the character of fact itself.

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Additional info for A Mapmaker's Dream: The Meditations of Fra Mauro, Cartographer to the Court of Venice: A Novel

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When this alloy is given a particular heat treatment, a material is obtained which, compared with iron, has better magnetic properties at low values of magnetizing force and larger resistivity. As shown later, both these properties are desirable. 025 inch, and annealed; it is designated in the trade literature as silicon steel sheets and strip. The sheet form is convenient for punching into many shapes used in the construction of clectroma�­ netic apparatus. Typical shapes of punchings are shown in Fig.

Sanford and E. G. Bennett, " An Apparatus for Magnetic Testing at High Mag­ netizing Forces," J. Res. Nat. Bur. Statui. , 10 ( 1933 ), 567-573. 1 7 R. L. Sa nford and E. G. 000 Oersteds," J. Res. Nat. Bur. Slatui. , 23 (1939), 415-425. 34 PROPERTIES OF FERROMA GNETI C MA TERIALS [Ch. l of the sp e cim en . The instrument connections are essent i ally the same as for the Fahy simplex permeameter. 6. ENGINEERING UTI LIZATION OF FERROMAGNETIC MATERIALS A d etaile d study of the data of Figs. ISa and ISb and Table I shows that the various al l o ys mentioned displa y the characteristics typi ca l of ferromagnetic materi als to m arked ly varying degrees.

When a rearrange ment of the magnetic vectors occurs, the ba lance between the m ag n eti c and electric forces is disturbed. Consequently, the ph ysical dimensions of the material arc observed to vary. This phenomeno n is one of m any effects which have to do with strains, mechan­ ical or magne tic , and arc r eferred to col lective l y as magnetostriction. The magnetostrictive p rop erties of iron a rc opposi te to those of ni ckel . The effect of m echanical tension on iron is to increase the magnetizatio n for a spe ci fi ed magnetizing force, whereas the effect of mechanical com · pre ssion is to de crease it.

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A Mapmaker's Dream: The Meditations of Fra Mauro, Cartographer to the Court of Venice: A Novel by James Cowan


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