1884 Thomas Gray Earthquake Recorder Seismograph Scientific American

Description

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This is an original antique issue of Scientific American for February 2, 1884. This issue is 20 pages including the covers measuring about 16.25" x 11.25".
This issue is noteworthy since it contains a featured article illustrated with photos and drawings on Thomas Gray's earthquake recorder.
Other content includes an article on an automatic machine to cut paper and cardboard and an article on Gustav Trouve's electric jewels.
Scientific American was a leading science and technology publication of the 19th century which is still in print today.  Each issue is a large over sized format richly illustrated with numerous engravings.
These issues are original antiques published well over 100 years ago.  There will typically be some toning of the paper from age as well as a few small nicks or chips on the edges but these issues are all 100% complete, solidly intact and in good to very good shape overall.  This issue is placed in a plastic archival sleeve with cardboard backing from which it can be removed for framing or display if you wish to do so.  Please see our other auctions for similar items.  Email any questions.  Thanks for looking.
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inkfrog terapeak
inkFrog Analytics
Telescope Eyepiece 1.25 Inch 40mm Multilayer Wideband Coating Monocular Eyepiece
Feature:
1. Eyepiece construction: Wide angle and long view relief, providing more complete field of view and comfortable viewing experience.
2. 1.25 inch 40mm eyepiece, provides the widest field of view with additional clarity and long view.
3. Full metal body, full surface multi-layer coating, high quality optical performance.
4. Soft rubber eye protector goggles, standard 1.25 inch thread.
5. Sky and ground dual purpose, suitable for all astronomical telescope(31.7mm interface), used for astronomical observation of the surface of the moon, planets, nebulae, star clusters, dispersion nebulae and other heavenly body, high brightness, large field of view, very comfortable observation.
Specification:
Condition: 100% Brand New
Item Type: Monocular Eyepiece
Material: Metal
Color: Black
Coating: Full Multilayer Coating, High Definition, Two Sets 4PCS Multilayer
Fitment: for All Astronomical Telescope(31.7mm/1.25inch Interface)
Weight: Approx. 100g
Focal Length: Approx. 40mm/1.57inch, Long-focus, Medium and Low Power Eyepiece
Size: Approx. 31.7mm/1.25inch
Package List:
1 x Monocular Eyepiece
1 x Storage Box
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