 | American Association for the Advancement of Science - 1885 - 862 pages
...kindly authorized the expense of the construction of the necessary apparatus, which was designed by Mr. Geo. B. Clark, of the firm of Alvan Clark & Sons, and which was made under his superintendence. A ring having an outside face of two inches was made... | |
 | Astronomische Gesellschaft (Germany) - 1881 - 1028 pages
...magnitude it seemed desirable to attempt an improvement in the illumination of the Meridian Circle. Mr. Geo. B. Clark of the firm of Alvan Clark & Sons took the matter in hand, and after many experiments in which it was found that the light falling upon... | |
 | American Association for the Advancement of Science - 1885 - 474 pages
...kindly authorized the expense of the construction of the necessary apparatus, which was designed by Mr. Geo. B. Clark, of the firm of Alvan Clark & Sons, and which was made under Ms superintendence. A ring having an outside face of two inches was made in... | |
 | American Association for the Advancement of Science - 1885 - 470 pages
...kindly authorized the expense of the construction of the necessary apparatus, which was designed by Mr. Geo. B. Clark, of the firm of Alvan Clark & Sons, and which was made under his superintendence. A ring having an outside face of two inches was made... | |
 | Edward Charles Pickering - 1888 - 816 pages
...some experiments. It was fitted to the Tolles stand, shown in Fig. 8. It is marked A in the drawing. It was found, after a somewhat extended trial, that...is fitted a slide, carried by the precision screw /'. The object to be measured is held in position upon the moving plate by the clips shown in the cut.... | |
| |
... under exactly the conditions which prevail in actual work with this instrument. It was therefore determined to try the method with the meridian circle of Harvard College Observatory. Professor Pickering kindly authorized the expense of the construction... 