Arthur H. Crazier
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Edgar Buckingham: Fluorescence of Quinine Salts
Bull. Hist. Chem., VOLUME 27, Number 1 (2002) 57 EDGAR BUCKINGHAM: FLUORESCENCE OF QUININE SALTS John T. Stock, University of Connecticut Malaria, an often-fatal disease, has been a worldwide factured from cinchona trees that are cultivated in South plague for several thousand years. The discovery of America and in the Far East. the efficacy of substances present in the bark of vari- It must have been known ous cinchona trees, native since ancient times that certain to the Andes, provided substances appear to have one some relief. A real anti- color when viewed by transmit- malarial drug was not ted light and another when available until 1820, when viewed obliquely. Mineralo- Joseph Baptiste Caventou gists recognize a type of fluor- (1795-1877) and Josephe spar, pale green when viewed Pelletier (1788-1842) iso- against the light, but appearing lated quinine from the blue when viewed at an angle bark (1). Eighty years af- to the light. Unrefined petro- ter their discovery, a statue leum shows the same kind of honoring these chemists effect, as do certain substances was erected in Paris (Fig. when in solution. Fluorescein, 1). used both in the laboratory as Other workers estab- an indicator and industrially for lished the formula for qui- the location of leaks in waste nine, showed that it acts as water systems, is a familiar ex- a diacid base, and that it ample. Another is quinine or, is a methoxy derivative of because of its low solubility in a companion alkaloid, cin- water, one of its salts. The so- chonine. The elucidation lution, colorless when viewed of the structure of these directly, appears blue when compounds, largely due to viewed at an angle to the inci- the work of Wilhelm dent light. -
Autobiography of Sir George Biddell Airy by George Biddell Airy 1
Autobiography of Sir George Biddell Airy by George Biddell Airy 1 CHAPTER I. CHAPTER II. CHAPTER III. CHAPTER IV. CHAPTER V. CHAPTER VI. CHAPTER VII. CHAPTER VIII. CHAPTER IX. CHAPTER X. CHAPTER I. CHAPTER II. CHAPTER III. CHAPTER IV. CHAPTER V. CHAPTER VI. CHAPTER VII. CHAPTER VIII. CHAPTER IX. CHAPTER X. Autobiography of Sir George Biddell Airy by George Biddell Airy The Project Gutenberg EBook of Autobiography of Sir George Biddell Airy by George Biddell Airy This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg Autobiography of Sir George Biddell Airy by George Biddell Airy 2 License included with this eBook or online at www.gutenberg.net Title: Autobiography of Sir George Biddell Airy Author: George Biddell Airy Release Date: January 9, 2004 [EBook #10655] Language: English Character set encoding: ISO-8859-1 *** START OF THIS PROJECT GUTENBERG EBOOK SIR GEORGE AIRY *** Produced by Joseph Myers and PG Distributed Proofreaders AUTOBIOGRAPHY OF SIR GEORGE BIDDELL AIRY, K.C.B., M.A., LL.D., D.C.L., F.R.S., F.R.A.S., HONORARY FELLOW OF TRINITY COLLEGE, CAMBRIDGE, ASTRONOMER ROYAL FROM 1836 TO 1881. EDITED BY WILFRID AIRY, B.A., M.Inst.C.E. 1896 PREFACE. The life of Airy was essentially that of a hard-working, business man, and differed from that of other hard-working people only in the quality and variety of his work. It was not an exciting life, but it was full of interest, and his work brought him into close relations with many scientific men, and with many men high in the State. -
A Replica of the Stretch Clock Recently Reinstated at the West End of Independence Hall
A replica of the Stretch clock recently reinstated at the west end of Independence Hall. (Photograph taken by the author in summer of 197J.) THE Pennsylvania Magazine OF HISTORY AND BIOGRAPHY The Stretch Qlock and its "Bell at the State House URING the spring of 1973, workmen completed the construc- tion of a replica of a large clock dial and masonry clock D case at the west end of Independence Hall in Philadelphia, the original of which had been installed there in 1753 by a local clockmaker, Thomas Stretch. That equipment, which resembled a giant grandfather's clock, had been removed in about 1830, with no other subsequent effort having been made to reconstruct it. It therefore seems an opportune time to assemble the scattered in- formation regarding the history of that clock and its bell and to present their stories. The acquisition of the original clock and bell by the Pennsylvania colonial Assembly is closely related to the acquisition of the Liberty Bell. Because of this, most historians have tended to focus their writings on that more famous bell, and to pay but little attention to the hard-working, more durable, and equally large clock bell. They have also had a tendency either to claim or imply that the Liberty Bell and the clock bell had been procured in connection with a plan to celebrate the fiftieth anniversary, or "Jubilee Year," of the granting of the Charter of Privileges to the colony by William Penn. But, with one exception, nothing has been found among the surviving records which would support such a contention. -
This Season's Colours
news & views one critical bundle radius, derived from the the assemblies can be tuned (it should be e-mail: [email protected]; relative energetic costs of filament bending noted that the models are idealized and [email protected] and interfilament spacing distortion. Below do not contain all the relevant elements; this critical radius, the preferred morphology particularly, entropic and thermal effects References corresponds to bundles with a circular are not yet included, and could turn out 1. King, H., Schroll, R. D., Davidovitch, B. & Menon, N. Proc. Natl Acad. Sci. USA 109, 9716–9720 (2012). cross-section, whereas above it ribbon-like to be important). The task now is to find 2. Irvine, W. T. M., Vitelli, V. & Chaikin, P. M. Nature assemblies are favoured. Experimental experimental ways of controlling and 468, 947–951 (2010). and numerical verification of the authors’ manipulating these physical parameters, 3. Hure, J., Roman, B. & Bico, J. Phys. Rev. Lett. 106, 174301 (2011). 4. Meng, G., Paulose, J., Nelson, D. R. & Manoharan, V. N. Science predictions provides reinforcement of this for example via variation of temperature, 343, 634–637 (2014). simple yet insightful theory. solvents and concentrations. ❐ 5. Hall, D. M., Bruss, I. R., Barone, J. R. & Grason, G. M. Grason and colleagues’ modelling study Nature Mater. 15, 727–732 (2016). 6. Chiti, F. & Dobson, C. M. Annu. Rev. Biochem. is an important step towards the quantitative Eran Sharon is at the Racah Institute of Physics, 75, 333–366 (2006). understanding — and eventually, better The Hebrew University of Jerusalem, Jerusalem, 7. Seung, H. -
Joseph Saxton
MEMOIR OP JOSEPH SAXTON. 1799-1873. BY JOSEPH HENRY. HEAD BEFOEB THB NATIONAL ACADEMY, OCT. 4,1874. 28T BIOGRAPHICAL MEMOIR OF JOSEPH SAXTON. MR. PRESIDENT AND GENTLEMEN OF THE ACADEMY :— AT the last session of the National Academy of Sciences I was appointed to prepare an account of the life and labors of our lamented associate, Joseph Saxton, whose death we have been called to mourn. From long acquaintance and friendly relations with the deceased, the discharge of the duty thus devolved upon me has been a labor of love, but had he been personally unknown to me, the preparation of the eulogy would have been none the less a sacred duty, which I was not at liberty on any account to neglect. It is an obligation we owe to the Academy and the world to cherish the memory of our departed associates; their reputation is a precious inheritance to the Academy which exalts its character and extends its usefulness. Man is a sympathetic and imitative being, and through these characteristics of his nature the memories of good men produce an important influence on posterity, and therefore should be cherished and perpetuated. Moreover, the certainty of having a just tribute paid to our memory after our departure is one of the most powerful inducements to purity of life and propriety of deportment. The object of the National Academy is the advancement of science, and no one is considered eligible for membership who has not made positive additions to the sum of human knowledge, or in other words, has not done something to entitle him to the appellation of scientific. -
“Photography in the United States,” 22 April 1853
“Photography in the United States,” 22 April 1853 (keywords: Louis Jacques Mandé Daguerre, François Arago, Joseph Nicéphore Niépce, crystalotype, stereoscope, David Brewster, Levi L. Hill, Samuel F. B. Morse, James R. Chilton, James Miles Wattles, William Henry Fox Talbot, James Campbell, Mathew B. Brady, ivorytype, John A. Whipple, Dr. George Phillip Bond, Armand Hippolyte Louis Fizeau, Antoine François Jean Claudet, Charles H. Williamson, talbotype, calotype, crystalotype,” ivorytype, Niepce de Saint Victor, history of the daguerreotype, history of photography.) ———————————————————————————————————————————— THE DAGUERREOTYPE: AN ARCHIVE OF SOURCE TEXTS, GRAPHICS, AND EPHEMERA The research archive of Gary W. Ewer regarding the history of the daguerreotype http://www.daguerreotypearchive.org EWER ARCHIVE N8530001 ———————————————————————————————————————————— Published in: New-York Tribune (semi-weekly) 8:825 (22 April 1853): 1. PHOTOGRAPHY IN THE UNITED S TATES. HISTORY OF THE INVENTION. The art of Photography—more popularly known as Daguerreotyping—is brought to so great a perfection in this country, and prosecuted on a scale of such magnitude, and the different manufactures connected with it are of such importance, especially in this City, that we propose giving a few details respecting them, and also a sketch of the origin and progress of this important discovery. Several designations distinguish this new art—it was originally called Photography, or writing by light; afterward, the art of Photogenic drawing, or drawing produced or occasioned by light; then Heliography, or writing by the sun—the latter term being that used by the experimenter who first succeeded in fixing the delineations of pictures produced by light—Mons. Daguerre, whose name has originated another and the most general title by which the art is known—Daguerreotyping—a compliment to the discoverer which will hand his name down to the latest posterity. -
The Fresnel Equations and Brewster's Law
The Fresnel Equations and Brewster's Law Equipment Optical bench pivot, two 1 meter optical benches, green laser at 543.5 nm, 2 10cm diameter polarizers, rectangular polarizer, LX-02 photo-detector in optical mount, thick acrylic block, thick glass block, Phillips multimeter, laser mount, sunglasses. Purpose To investigate polarization by reflection. To understand and verify the Fresnel equations. To explore Brewster’s Law and find Brewster’s angle experimentally. To use Brewster’s law to find Brewster’s angle. To gain experience working with optical equipment. Theory Light is an electromagnetic wave, of which fundamental characteristics can be described in terms of the electric field intensity. For light traveling along the z-axis, this can be written as r r i(kz−ωt) E = E0e (1) r where E0 is a constant complex vector, and k and ω are the wave number and frequency respectively, with k = 2π / λ , (2) λ being the wavelength. The purpose of this lab is to explore the properties the electric field in (1) at the interface between two media with indices of refraction ni and nt . In general, there will be an incident, reflected and transmitted wave (figure 1), which in certain cases reduce to incident and reflected or incident and transmitted only. Recall that the angles of the transmitted and reflected beams are described by the law of reflection and Snell’s law. This however tells us nothing about the amplitudes of the reflected and transmitted Figure 1 electric fields. These latter properties are defined by the Fresnel equations, which we review below. -
Superintendent's Annual Narrative Report, Independence National
Note the following: Page 15: Partnerships - “A challenge INDE faced in 2007 was finalizing long-term agreements with both the Independence Visitor Center Corporation (IVCC) and the National Constitution Center (NCC). Because of the complexity of these agreements, they are still under review in the Departments Office of the Solicitor. The IVCC and NCC continue to operate under Special Use Permits.” Page 16: Cooperating Agreement - “In 2007, INDE managed 12 Commercial Use Permits…The park successfully worked with the IVCC to respond to complaints from tour operators, who are competing for prime locations within the building to advertise their tours. While this problem will likely persist until the space within the Independence Visitor Center has been reorganized a project that will take place during 2008 through a series of meetings with the tour operators the park is continuing to address their concerns.” INDEPENDENCE NATIONAL HISTORICAL PARK SUPERINTENDENT’S ANNUAL NARRATIVE REPORT October 1, 2006 – September 30, 2007 Introduction The Superintendent and staff of Independence National Historical Park (INDE) share the stewardship of some of the most important symbols of our nation’s heritage: the Liberty Bell, Independence Hall, Congress Hall and Franklin Court. They also share responsibility for Edgar Allan Poe National Historic Site (EDAL), Thaddeus Kosciuszko National Memorial (THKO) and Gloria Dei (Old Swedes’) Church National Historic Site (GLDE). Independence National Historical Park continued to work on several multi-year, multi-faceted projects including the commemoration of the President’s House Site, the security plan for the Liberty Bell Center and Independence Square, the Long Range Interpretive Plan, the rehabilitation of Franklin Court and finalizing partnership agreements. -
A Fig for Your Philosophy and Great Knowledge in the Sciences
Nagle 1 jeff Nagle Professors Dorsey & Minkin History 91 December 17,2011 A Fig For Your Philosophy and Great Knowledge in the Sciences: Observation, Deception, Scientific Fraud and Social Authority in the Antebellum Museum Abstract: There is an increasingly sophisticated literature on the role played by museums in reaffirming social norms of examination in the antebellum United States. This literature has largely focused on the way museums presented this knowledge to the public, not how audiences reacted to claims of scientific authority. Popular reaction to pseudoscientific claims demonstrated to the public in the scientific context of museums, in this case Charles Redheffer's 1812 perpetual motion device and P. T. Barnum's Fejee Mermaid, shed light on the close relationship between early popular scientific observation and ways of judging authenticity and deception in the commercial and social realms of the antebellum period. Have you travelled thro' the pages afthe Natural Historian? come and satisfyyour mind) that he has not deceived you. Come and look nature in the face, andyou will be more highly delighted and satisfied than by historic description. Have you) at any time) read ofbeings whose existence you doubted? call at this repository. Your doubts will vanish) and before you depart your mind may receive impressions emanently conductive to morality and virtue. Those who have no leisure to read) may) at a trifling expence, furnish themselves with a considerable portion ofknowledge--a species ofknowledge that may be found necessary -
Back Matter (PDF)
[ 229 • ] INDEX TO THE PHILOSOPHICAL TRANSACTIONS, S e r ie s B, FOR THE YEAR 1897 (YOL. 189). B. Bower (F. 0.). Studies in the Morphology of Spore-producing Members.— III. Marattiaceae, 35. C Cheirostrobus, a new Type of Fossil Cone (Scott), 1. E. Enamel, Tubular, in Marsupials and other Animals (Tomes), 107. F. Fossil Plants from Palaeozoic Rocks (Scott), 1, 83. L. Lycopodiaceae; Spencerites, a new Genus of Cones from Coal-measures (Scott), 83. 230 INDEX. M. Marattiaceae, Fossil and Recent, Comparison of Sori of (Bower), 3 Marsupials, Tubular Enamel a Class Character of (Tomes), 107. N. Naqada Race, Variation and Correlation of Skeleton in (Warren), 135 P. Pteridophyta: Cheirostrobus, a Fossil Cone, &c. (Scott), 1. S. Scott (D. H.). On the Structure and Affinities of Fossil Plants from the Palaeozoic Ro ks.—On Cheirostrobus, a new Type of Fossil Cone from the Lower Carboniferous Strata (Calciferous Sandstone Series), 1. Scott (D. H.). On the Structure and Affinities of Fossil Plants from the Palaeozoic Rocks.—II. On Spencerites, a new Genus of Lycopodiaceous Cones from the Coal-measures, founded on the Lepidodendron Spenceri of Williamson, 83. Skeleton, Human, Variation and Correlation of Parts of (Warren), 135. Sorus of JDancea, Kaulfxissia, M arattia, Angiopteris (Bower), 35. Spencerites insignis (Will.) and S. majusculus, n. sp., Lycopodiaceous Cones from Coal-measures (Scott), 83. Sphenophylleae, Affinities with Cheirostrobus, a Fossil Cone (Scott), 1. Spore-producing Members, Morphology of.—III. Marattiaceae (Bower), 35. Stereum lvirsutum, Biology of; destruction of Wood by (Ward), 123. T. Tomes (Charles S.). On the Development of Marsupial and other Tubular Enamels, with Notes upon the Development of Enamels in general, 107. -
13. Fresnel's Equations for Reflection and Transmission
13. Fresnel's Equations for Reflection and Transmission Incident, transmitted, and reflected beams Boundary conditions: tangential fields are continuous Reflection and transmission coefficients The "Fresnel Equations" Brewster's Angle Total internal reflection Power reflectance and transmittance Augustin Fresnel 1788-1827 Posing the problem What happens when light, propagating in a uniform medium, encounters a smooth interface which is the boundary of another medium (with a different refractive index)? k-vector of the incident light nincident boundary First we need to define some ntransmitted terminology. Definitions: Plane of Incidence and plane of the interface Plane of incidence (in this illustration, the yz plane) is the y plane that contains the incident x and reflected k-vectors. z Plane of the interface (y=0, the xz plane) is the plane that defines the interface between the two materials Definitions: “S” and “P” polarizations A key question: which way is the E-field pointing? There are two distinct possibilities. 1. “S” polarization is the perpendicular polarization, and it sticks up out of the plane of incidence I R y Here, the plane of incidence (z=0) is the x plane of the diagram. z The plane of the interface (y=0) T is perpendicular to this page. 2. “P” polarization is the parallel polarization, and it lies parallel to the plane of incidence. Definitions: “S” and “P” polarizations Note that this is a different use of the word “polarization” from the way we’ve used it earlier in this class. reflecting medium reflected light The amount of reflected (and transmitted) light is different for the two different incident polarizations. -
Sir David Brewster Michael W
Downloaded from https://www.cambridge.org/core MicroscopyPioneers Pioneers in Optics: Sir David Brewster Michael W. Davidson National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306 . IP address: [email protected] 170.106.40.40 Sir David Brewster founder of the British Association for the Advancement of (1781–1868) Science. Sir David Brewster was a Scottish physicist who invented An energetic enthusiast of color, Brewster invented the the kaleidoscope, made major improvements to the stereoscope, kaleidoscope in 1816 and patented it the following year. He , on and discovered the polarization phenomenon of light reflected published his extensive studies on the theory, design, and 02 Oct 2021 at 08:35:21 at specific angles. Brewster construction of kaleidoscopes in 1819 in a volume entitled was born in Jedburgh, Treatise on the Kaleidoscope. Apparently there were some Scotland, in 1781 and grew problems with the registration of his patent, because he was to become a brilliant student not able to enforce infringements and many companies began who entered the University to offer custom versions of the kaleidoscope without paying , subject to the Cambridge Core terms of use, available at of Edinburgh at the age of 12 royalties. The instrument ignited a craze in the early nineteenth to study the ministry. He was century and quickly became a household toy for both children a prolific writer and became and adults alike. editor of the Edinburgh Brewster was deeply interested in photography and had Magazine in 1802 and the many conversations with Fox Talbot about the design of Edinburgh Encyclopedia in Talbot’s Calotype process.