Photograph - O. Max Gardner Building(13)

Photograph from the front of the O. Max Gardner Building; black and whitehttps://digitalcommons.gardner-webb.edu/gardner-webb-buildings-and-grounds-o-max-gardner-building/1028/thumbnail.jp

Sample stationary from the J. P. Stevens Engraving Company

Packet of samples of engraved stationary from the J. P. Stevens Engraving Company

Biographical sketch of Professor Charles Waldo Haskins, C.P.A.

Originally published by: Atlantic Publishing and Engraving Company

Cover of booklet advertising J. P. Stevens Engraving Company

Cover of booklet advertising the J. P. Stevens Engraving Company in Atlanta, Georgia

Reverdy Johnson Portrait

The colored engraving features a seated portrait of Reverdy Johnson from the waist up. It is printed on off-white paper. Johnson served as Mary Surratt\u27s defense attorney in 1865.https://scholarsjunction.msstate.edu/fvw-artifacts/1146/thumbnail.jp

Reverdy Johnson Portrait

The colored engraving features a seated portrait of Reverdy Johnson from the waist up. It is printed on off-white paper. Johnson served as Mary Surratt\u27s defense attorney in 1865.https://scholarsjunction.msstate.edu/fvw-prints/1069/thumbnail.jp

Engraved portrait of Abraham Lincoln

Engraved portrait of A. Lincoln, by M. W. Baldwin, 1916. Pub. by Bureau of Engraving and Printing. After a photo by A. Berger. Ref: O-42. Abraham Lincoln faces the right side of the page. Oval shaped portrait of Abraham Lincoln. The photograph is black and white. published by the Bureau of Engraving and Printing (American, 1862-present), from a photograph by Matthias William Baldwin (American 1795-1866)https://scholarsjunction.msstate.edu/fvw-prints/1886/thumbnail.jp

High power diode laser marking and engraving of building materials

A Diomed 60W-cw high power diode laser (HPDL) has been used for the marking and engraving of various building materials, including; marble, granite, clay tiles, ceramic tiles, roof tiles, ordinary Portland cement (OPC) and clay bricks. Morphological and microstructural characteristics are presented. The basic mechanisms of marking/engraving and characteristics of the beam absorption are described. The effects of material texture, colour and laser processing parameters are reported. The work shows that engraving depths of over 2mm (0.75mm for a single pass) can be achieved on marble substrates by thermal disintegration of CaCO3 into loose CaO powder and CO2 gas. Uniform amorphous glazed lines (1-3mm line width) of a colour different from the untreated materials can be generated on clay tiles, ceramic tiles, roof tiles, clay bricks and OPC by solidification phase formation after laser melting of these materials. Effects of atmospheric conditions, for instance using O2 and Ar gas shrouds, have been examined, with different coloured marks being observed when different shroud gases are used. To demonstrate the practical worth of the process a UMIST crest has been marked on a ceramic tile using the system. Laser beam reflectivity is found to depend not only on material composition but also its colour. Reflectivity has been found to range between 12% to 18% for the various construction materials used in the experiment, except for marble (grey) which showed over 27% reflectivity. Since the HPDL is a portable device, in-field application of these processing techniques can be realised, which would be either impossible or difficult when using other types of lasers

Industries and Wealth of the Principal Points in Maine: Being Portland, Brunswick, Lewiston, Auburn, Lisbon, Lisbon Falls, Saco, Biddeford, Augusta, Gardiner, Hallowell, Bangor, Old Town, Belfast, Bath, Topsham, Rockland, Bar Harbor and Ellsworth and Others

https://digicom.bpl.lib.me.us/books_pubs/1213/thumbnail.jp

Interlaced spin grating for optical wave filtering

Interlaced Spin Grating is a scheme for the preparation of spectro-spatial periodic absorption gratings in a inhomogeneously broadened absorption profile. It relies on the optical pumping of atoms in a nearby long-lived ground state sublevel. The scheme takes advantage of the sublevel proximity to build large contrast gratings with unlimited bandwidth and preserved average optical depth. It is particularly suited to Tm-doped crystals in the context of classical and quantum signal processing. In this paper, we study the optical pumping dynamics at play in an Interlaced Spin Grating and describe the corresponding absorption profile shape in an optically thick atomic ensemble. We show that, in Tm:YAG, the diffraction efficiency of such a grating can reach 18.3% in the small angle, and 11.6% in the large angle configuration when the excitation is made of simple pulse pairs, considerably outperforming conventional gratings.Comment: 11 pages, 13 figures in Physical Review A, 201