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Science Art: Égouts de Paris, by Jules Ferat. - There's a subtitle here that Google Translate renders as "Sewer cleaning wagon. (System of Chief Engineer Mr. Belgrand.)". This is engineering from the third quarter of the 19th century, used to keep cities cleaner than they'd ever been before. I found this in the public domain collections of the Paris Museums, specifically the Musée Carnavalet, Histoire de Paris. 15101

Science Art: Konstantin E. Tsiolkovsky, by David K. Stone. - I found the image in the San Diego Air & Space Museum's "Aerophilately Special Collection" on Flickr; this is actually a detail from the full image, which includes both a cancelled stamp (this seems to have been a post card, or a mockup of one) and a block of text about Tsiolkovsky's role as the father of astronautics and rocket dynamics, despite being self-taught and mostly deaf. The collection mostly consists of "The Pioneers of Flight: The Official Collection of the International Aerospace Hall of Fame." This particular card was issued in 1989 (the postmark is actually labeled "October 27, 1989"). Others in the collection include the usual suspects (The Wright Brothers, John Glenn, Leroy R. Grumman) but also some less-known pioneers like astronaut William A. Anders, who orbited the moon, and Sir Frank Whittle, the pilot and flight instructor who patented the turbojet engine. 15091

Science Art: Fowler - Coregonus Nelsonii Bean. - This is an Alaska whitefish, a cousin of the salmon whose genus name, Coregonus, means "angle-eyed." But this isn't the eye. It's the alimentary canal, the guts, taken from a dissection done for the 1904 edition of Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge. It's useful to know how to gut a whitefish, for sure. But this fish traveled before the image was made -- it's an Alaskan fish but was studied by Henry Fowler in Philadelphia as a way of helping describe what made this Alaskan whitefish an Alaskan whitefish: "As this species is only known from Dr. Bean’s description and several references, it is of value to have more detailed information for the comparison of the species." It has a large spleen, as you can see. 15082

Science Art: Paraboloide Circular 02, by Rodrigo Argenton - This is a circular paraboloid, a shape with "one axis of symmetry and no center of symmetry," according to Wikipedia, which also, helpfully, says a *circular* paraboloid is a paraboloid that contains circles. There's an equation -- z=(x2/a2)+(y2/b2) -- that describes a circular paraboloid if a and b are equal. It's a useful shape because a straight line that bounces into a circular paraboloid at any point will want to bounce off toward the same focal point ... which means it's a super-useful shape for things like radar antennas and the magnifying mirrors used in telescopes. It's also the shape of a wok, which is why Chinese cookware can serve so well as an impromptu wireless signal-booster. The picture was one of the Featured Images of 2019 on Wikimedia Commons. 15073

Science Art: Azimuth and Altitude Instrument, c. 1876 - This is an illustration from the Great Exhibition, 1876, or The great Centennial exhibition critically described and illustrated, by Phillip T. Sandhurst, which you can leaf through over on archive.org. Here's how this machine, part of the "Machinery Hall" chapter, is described: We have mentioned before the fine exhibit of astronomical instruments made by Messrs. Fauth & Co., of Washington, D. C, and we refer to this exhibit again to call attention to an exceedingly perfect Altitude and Azimuth Instrument which has been purchased by the United States Coast Survey Department for triangulation and determination of azimuth. The altitude of a star or other body is its height above the horizon expressed in degrees, the greatest altitude of course being ninety degrees. The azimuth is the angle made by the meridian and the vertical circle in which a heavenly body is situated, and is measured along the horizon for the north or south towards the west, according as the north or south pole is elevated above the horizon, to the point where a circle passing through the zenith and the body cuts the horizon. The instrument of which we speak, and which is represented by the engraving on page 483, from the nature of its construction is employed in the measurement of vertical and horizontal angles, and may be used as transit for time observation, also for double zenith distances for latitude, and will determine the astronomical position of any station. For geodetic purposes it is used in primary triangulation to measure the angles with the utmost precision. It has two graduated circles and a telescope, the planes of the circles being at right angles to each other, one called the azimuth circle being connected with a solid support, on which it is leveled and kept in a horizontal position, and the other called the altitude circle, which is mounted on a horizontal axis, which also carries the telescope like a transit. The design and construction of the instrument are quite novel, combining all the advantages of a repeating instrument without its defects. The horizontal limit, which is thirteen inches in diameter, is graduated to five minutes, and may be read off by means of three microscopes at different points to the nearest single second, these microscopes being illuminated by prisms which derive their light from overhead, and are effective for any position of the circle. This circle may be shifted if desired, so as to bring different parts of the graduation under the microscopes, and thereby eliminate any error or eccentricity in division. The vertical circle is ten inches in diameter, and is graduated the same as the horizontal circle, but is read by two microscopes, a very sensitive level reading to single seconds of arc being affixed to the microscopes to note any deviation from the vertical. This circle may also be shifted for position. Both circles are entirely free from clamps, these being attached to the centre, thereby avoiding the great risk of strain. The clamps and slow motion have differential screws. For time observation a striding level of the utmost perfection is supplied, which is set over the hard pivots of the telescope axis, so as to note any deviation from the meridian, the level being ground to a radius of about two thousand feet, each division of its graduation representing a second of arc. Both this and the level over the microscopes of the vertical circle have air-chambers to correct the bubbles for changes of temperature. So now you know how to operate it, mostly. There's a bit more on the operation of the telescope component, but 15065

costanzian

Undulates anguilliformly at you to confuse and threaten you with my highly maneuverable body

costanzian

Science Art: Solar Explosions, G79, by Clement Lindley Wragge. - https://guildofscientifictroubadours.com/2026/04/27/science-art-solar-explosions-g79-by-clement-lindley-wragge/

Science Art: Mars - Cloudy North Polar Cap, by Andrea Luck - https://guildofscientifictroubadours.com/2026/04/20/science-art-mars-cloudy-north-polar-cap-by-andrea-luck/

Science Art: Earth-moon Relationship MSC, HOUSTON, TX - https://guildofscientifictroubadours.com/2026/04/13/science-art-earth-moon-relationship-msc-houston-tx/

Science Art: Chromista - https://guildofscientifictroubadours.com/2026/04/06/science-art-chromista/

Science Art: Eyes of Epeira conica x30, 1884 - https://guildofscientifictroubadours.com/2026/03/30/science-art-eyes-of-epeira-conica-x30-1884/

Science Art: OSIRIS-REx after SRC release, 2023 - https://guildofscientifictroubadours.com/2026/03/23/science-art-osiris-rex-after-src-release-2023/

Science Art: Stand-Pipe, Boston, 1882 - https://guildofscientifictroubadours.com/2026/03/16/science-art-stand-pipe-boston-1882/

Science Art: Aneurismal dilatation (arteriovenous aneurism)..., 1915. - https://guildofscientifictroubadours.com/2026/03/09/science-art-aneurismal-dilatation-arteriovenous-aneurism-1915/

Science Art: Modern Electrical Construction, Fig. 58, 1905 - https://guildofscientifictroubadours.com/2026/03/02/science-art-modern-electrical-construction-fig-58-1905/

Science Art: Eye orbit anatomy anterior 2, by Patrick Lynch. - https://guildofscientifictroubadours.com/2026/02/23/science-art-eye-orbit-anatomy-anterior-2-by-patrick-lynch/

Science Art: Kentrosaurus aethiopicus, by H. Zell. - https://guildofscientifictroubadours.com/2026/02/16/science-art-kentrosaurus-aethiopicus-by-h-zell/

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