Abstracts of Technical Articles from Bell System Sources (01 January 1934)

Proc. I. R. E., October, 1933. Proc. I. R. E,, September, 1933. Proc. I. R. E., October, 1933. 159 160 BELL SYSTEM TECHNICAL JOURNAL sun. These facts lead to the conclusion that the direction of arrival of these waves is fixed in space; i.e., that the waves come from some source outside the solar system. Although the right ascension of this source can be determined from the d a t a with considerable accuracy, the error not being greater than ± 7.5 degrees, the limitations of the apparatus and the errors that might be caused by the ionized layers of the earth's atmosphere and by attenuation of the waves in passing over the surface of the earth are such that the declination of the source can be determined only approximately. Thus the value obtained might be in error by as much as ± 30 degrees. 

The data give for the coordinates of the region from which the waves seem to come a right ascension of 18 hours and a declination of -- 10 degrees. A Precision, High Power Metallographic Apparatus.4 FRANCIS F . LUCAS. In 1927 the design of an advanced type of metallographic apparatus became of interest. Preliminary designs were prepared and discussed at a conference in Jena, Germany, with the scientific staff of Carl Zeiss. The Zeiss works was commissioned to construct the apparatus. The work was directed by Professor A. Kohler, an outstanding authority on the optics of the microscope, head of the mikrodepartment of the Zeiss works, and Professor Walter Bauersfeld, a director of the Zeiss Foundation and inventor of the Planetarium.