An illustration of a man using Lockyer's telespectroscope. Sir Joseph Norman Lockyer (1836-1920), designed this instrument in order to observe the spectra of the prominences in full sunlight. Lockyer is best known for…

Plate from the publication Spectrum Analysis Explained, Including an Explanation of the Received Theory of Sound, Heat, Light, and Color by Dana Estes (1840-1909). The plate depicts Solar prominences as observed by…

Here Schellen is illustrating and explaining the phenomenon of sunspots. The accompanying text states: "In Fig. 106 the drawings marked I represent the varying phases through which a spot surrounded by a penumbra…

An illustration of a solar eclipse during the last 2 minutes, 25 seconds, therefore just before the reappearance of the sun's rays. The accompanying text states: ""Scarcely had the last ray of sunlight disappeared,"…

Chromolithographed frontispiece plate illustrates the solar spectrum in figure one with blood spectra as follows:

2: oxy haemogloben
3: haemoglobin (reduced haemoglobin)
4: methaemoglobin
5: acid haematin
6: alkaline…

Chromo-lithograph of the Spectra of the Metals of the Alkalis and Alkaline Earths, from the Drawings of [Robert] Bunsen and [Gustav] Kirchhoff. With Scale of Wave-Lengths Added.

Through research conducted in the…

Chromo-lithograph of the Spectra of the Stars and Nebulae compared with the Solar Spectrum and the Spectra of some of the Non-Metallic Elements.

Frontispiece of Biographical notice of Pres't Henry Morton, PH. D. showing a photographic reproduction of a painted portrait of Henry Morton (1836-1902). Morton was the first president of the Stevens Institute of…

Catalog entry for instruments designed for photometric analysis. Photometers can be used to measure the presence and concentration of organic and inorganic compounds in solution by determining the absorbance of specific…