David F. Malin

The Chronology of Archbishop James UssherRonald Lane Reese, Steven M. Everett, and Edwin D. Craun, Washington and Lee UniversityMost astronomers have heard ofthe famous 17th century biblical chronology of Archbishop James Ussher. who set October 23. 4004 b.c., as the date of the Creation. The date...

Improved Techniques for AstrophotographyDavid F. Malin, Anglo-Australian ObsetyatorySEVERAL RECENT ARTICLES in this magazine have described ways to improve the sensitivity of photographic materials for use at the low light levels encountered in astronomy. These hypersensitizing procedures have been...

_ LETTERS TO THE EDITORSRelative AlternativesIn "Black Holes and the Centrifugal Force Paradox" [SciENTinc American, March], Marek Arwr Abramouicz proposed that dose to a black hole the cen-nifugal force acting on orbltmg objects would push them inward. A different interpretation of the phenomenon...