Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 130
tain silver circle,which is carefully divided into degrees and fractions of a degree, the readings ofwhich change as the boxholding the spider-webs isturned, is next read. InFig. 59 is given a view ofthe rotating box and thegraduated silver circle. The box is then movedagain till the… … Fig. 58.—Second Position of theSpider-webs. A double star. Anothermeasure. I24 A Study of the Sky. Elimination ofbias. two different ways he obtains more independent resultsthan if he had moved the spider-webs in the same di-rection each time. By turning the box in two opposite
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-121-80.webp)
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-26-4.webp)