Instructions for Observing the Total Solar Eclipse of July 29 1878

Cover Instructions for Observing the Total Solar Eclipse of July 29 1878
Instructions for Observing the Total Solar Eclipse of July 29 1878
United States Naval Observatory
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Instrument, C or D.
An attempt should be made to measure" the thickness of the reversing layer by noting how long the lines continue bright. But for this purpose a chronograph capa-, ble of indicating the one hundredth part of a second will be necessary.
The Prominence b^n'cfnnn. Just before and just after totality the atmospheric glare is greatly reduced, and advantage should be taken of this circumstance to look carefully for new lines. The search should be directed particularly to that part
...of the spectrum lying above F, as it deserves, and will probably repay, careful study, and is very difficult to deal with in the absence of an eclipse. Instrument, C.
22 During totality, attend to the following points: In passing outward from the sun, are the li linos replaced by a diffuse band?. Does the /' line extend higher than the other hydrogen lines . ' Instruments, J, (', l>.
It !> known that the prominences consist mainly of hydrogen; but do they ever contain large quantities of calcium .


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