Remarkable spectroscope grating built for Johns Hopkins science
A detailed account of a new 110,000 lines per inch ruling grating used in a spectroscope, its metal plate mirror, and the precision ruling engine developed at Johns Hopkins University. The article notes the device’s underground guarded chamber, the diamond point carriage, and the automated adjustments ensuring exact spectral lines.
MENTIONED IN THIS ARTICLE
Allegheny
New York Tribune
Johns Hopkins University
Brashear
Baltimore
Cnly
Monkeys Loose in Philadelphia Marshes Spark Tax Probe
Reports say numerous monkeys roam marshes near Girard Point and Point Breeze, likely escaped from ships landing under the new Dingley tariff. Treasury agents investigate how simians and parrots reach Philadelphia waters while customs seizes smuggled animals and guards against further arrivals.
MENTIONED IN THIS ARTICLE
Delaware and Schuylkill River
Girard Point
Point Breeze
Treasury
Philippine Islands
Java
Rogers
Whitefield
Philadelphia
Mirror Break Sparks Talks of Bad Luck
Ned jokes about bad luck after a mirror breaks. Ted agrees. Ned asks where the misfortune will land and Ted answers with a tease that it will land behind.
MENTIONED IN THIS ARTICLE
Ned
Ted
Perseverance Adage Shaped by Addison’s Wit
A quotation from Addison urges steadfast effort as a path to success. It likens perseverance to a close companion, experience as a trusted advisor, caution as a senior guide, and hope as a protective guardian. The concise aphorism blends moral counsel with practical foresight.
MENTIONED IN THIS ARTICLE
Addison
Also Mentioned on This Page
Ayer
Walter Baker & Co
Walter Baker & Co. Limited
Dorchester, Mass
Vewlaz
DAVIS
Price
F. M. Davis Area Works Co
Deaver, Cole
Dru
ESTEY
Estey Organ Company
Brattleboro
Schilling
J. Tower
Boston
Montreal
Dublin
Pennsylvania
This is just the beginning! Our collection holds over 300 years of history, including rare newspapers, obituaries, marriage records, birth records, and so much more—most of which you won’t find anywhere else!