Essays and addresses / by professors and lecturers of the Owens College, Manchester.
- Victoria University of Manchester
- Date:
- 1874
Licence: Public Domain Mark
Credit: Essays and addresses / by professors and lecturers of the Owens College, Manchester. Source: Wellcome Collection.
Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.
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![nr.] met with considerable success. These observers have measured every sun-spot recorded by Mr. Carrington, from the beginning of 1854 to the end of i860, as well as every one photographed at the Kew Observatory from the beginning of 1862 to the beginning of 1867 ; and the results of all these measurements are recorded in the following diagram. In this diagram each curved Planetary Influence on Sun spot Activity. + DENOTES THE CENTRE OF THE V/S/BLE DISC. line is supposed to represent the behaviour, as regards size, of the various groups of spots as they pass across the disc of the sun from left to right. If, for instance, a spot were always to retain the same magnitude, its path would be represented by a horizontal line, but if it were to become smaller at the middle of its course than at either extremity, then we should have it repre- sented as in the first figure. Now, from this diagram, we find that whenever either Venus or Mercury is between our earth and the centre of the sun, the sun-](https://iiif.wellcomecollection.org/image/b21727910_0113.jp2/full/800%2C/0/default.jpg)
