TEN IMPORTANT PAPERS by P.A. Hansen (Peter Andreas Hansen). Leipzig, Bei S. Hirtzel, 1865-1870. German Text. Professionally Bound in hardcovers, half calf and cloth covered boards, gilt titling and designs to the spine, five raised spine bands, 7.5x11 inches, approximately 1350 pages (each paper paginated separately), and 4 folding plates. There is a handwritten list of the ten papers affixed to the front pastedown. "P. A. HANSEN'S MEMOIRS" is printed in gilt on the spine. GOOD condition. The covers are cracking at the spine folds but holding well, there is a small shelving label near the bottom of the spine, there is wear to the spine ends and corner tips, the boards have some rubbing, overall the covers are solid and attractive. Internally, there is a handwritten table of contents on the front pastedown, as noted above; there is a circular ex library blindstamp on the title page (Cardinal Kayes Library / Manhattan College / New York) and a few other minor library numbers and marks on other pages; there are pencil translations and notes here and there, most notably on the title page of each paper; otherwise this bound collection is complete, tight, bright, clean and clear. The ten papers (with my rather poor English translations in parenthesis) are: (1) BESTIMMUNG der SONNENPARALLAZE durch VENUSVORÜBERÄNGE vor der SONNENSCHEIBE mit BESONDERER BERUCKSICHTIGUNG des im Jahre 1874 EINTREFFENDEN VORUBERGANGES. Mit ZWEI PANIGLOBEN. (The DETERMINATION of the SUNSET PARALLAX by means of VENUS TRANSITIONS before SUNSET with SPECIAL REVIEW of the INITIAL TRANSITION in 1874. With TWO HEMISPHERE MAPS.) Pagination: [4], 95 pages (pages numbered 457 to 552). With 2 folding hemisphere maps. Bei S. Hirzel, Leipzig, Germany, 1870. (2) THEORIE der SONNENFINSTERNISSE und VERWANDTEN ERSCHEINUNGEN. Mit 2 Tafeln. (THEORY of SUN ECLIPSES and RELATED APPEARANCES. With 2 Plates.) Pagination: [2], 150 pages (pages numbered [305] to 454). With 2 folding maps. Undated, circa 1870. (3) Die THEORIE des AEQUATOREALS. (THEORY of (?)) Pagination: [2], 72 pages (pages numbered [433] to 504). Undated, circa 1870. (4) RELATIONEN einestheils ZWISCHEN SUMMEN und DIFFERENZEN und anderntheils ZWISCHEN INTEGRALEN und DIFFERENTIALEN. (RELATIONS BETWEEN TOTALS and DIFFERENCES, and the other part BETWEEN INTEGRALS and DIFFERENTIALS.) Pagination: [4], 77 pages (pages numbered [507] to 583). Bei S. Hirzel, Leipzig, Germany, 1865. (5) GEODÄTISCHE UNTERSUCHUNGEN. (GEODETIC STUDIES) Pagination: [4], 224 pages (numbered 1 to 224). Bei S. Hirzel, Leipzig, Germany, 1865. (6) Von der Methode der KLEINSTEN QUADRATE IM ALLGEMEINEN und in ihrer ANWENDUNG auf die GEODASIE. (The SMALLEST COMMON QUADRAT and in its APPLICATION to GEODESY.) Pagination: [4], 234 pages (pages numbered [573] to 806). Bei S. Hirzel, Leipzig, Germany, 1867. (7) Fortgesetzte GEODÄTISCHE UNTERSUCHUNGEN von der Methode der KLEINSTEN QUADRATE IM ALLGEMEINEN... (Continuation of GEODETIC STUDIES using the SMALLEST COMMON QUADRAT.) Pagination: [4], 184 pages. Bei S. Hirzel, Leipzig, Germany, 1868. (8) Entwickelung eines NEUEN VERÄNDERTEN VERFAHRENS zur AUSGLEICHUNG EINES DREIECKSNETZES... (Development of a NEW MODIFIED METHOD for the ADJUSTMENT of a TRIANGULAR NETWORK...) Pagination: [4], 101 pages (pages numbered [187] to 287). Bei S. Hirzel, Leipzig, Germany, 1869. (9) Entwickelung des Products einer POTENZ des RADIUS VECTORS... (Developments in Producing the POWER of RADIUS VECTORS...) Pagination:

[2], 99 pages (pages numbered [183] to 281). Undated, circa 1870. (10) Entwickelung der NEGATIVEN und UNGRADEN POTENZEN der QUADRATWURZEL der FUNCTION... (Development of the NEGATIVE and ODD POTENTIALS of the SQUARE ROOT of the FUNCTION...) Pagination: [4], 91 pages (numbered [285] to 376). Undated, circa 1870. INTERNATIONAL BIDDERS PLEASE NOTE: This Book is Thick and Heavy and will require additional shipping charges. You will be notified of the additional charges before your payment is accepted. Thanks.