Junkes J Joseph (3 results)

Paperback. Condition: Very Good. 1st Edition. stapled blue printed wraps; 8 clean, unmarked pages; with 16 photographic plates (loose); both in a quatro-folded slipcase; lite sunning but very little wear mostly of which is at the seams/hinges of the slipcase; owner's name on slipcase and booklet. a landmark spectral atlas and catalog published by the Vatican Observatory detailing the atomic emission wavelengths (measured in Angströms, of the element thorium. It serves as a highly accurate, universal reference standard for calibrating astronomical spectrographs and laboratory equipment. Because thorium is mono-isotopic and avoids complex hyperfine line splitting, its spectrum produces clean reference points critical for precise astronomical radial velocity and exoplanet searches. 16 b/w photograhic plates, each with three sections of the spectrum. (illustrator).…

(= Ricerche Spettroscopiche, Vol. 3, Nr. 3). S. 65-162 mit 24 Abbildungen. 4to. (24 cm) OBroschur. Città del Vaticano, Specola Vaticana 1966.

2 Bände: Teil I: Geometrisch und optisch gleichartige Halbprismen in nicht-gekreuzten Lagen. S. 265-378 mit 32 Textfig. -- Teil II: Geometrisch und optisch gleichwertige Halbprismen in symmetrischer Kreuzung nach Art des Herschel-Risley-Doppelprismas bei einfachem Strahlendurchgang. (= Ricerche Spettroscopiche, Vol. 3, r. 7 und 8). S. 381-529 mit 38 Textfig. 4to (24 cm) OBroschuren. Città del Vaticano, Specola Vaticana 1970-1974.…