SCIENCE SERIES. 



No. 115. TRAVERSE TABLES, showing the difference of Latitude 

 and Departure for distances between I and 100 and for Angles to 

 Quarter Degrees between i degree and 90 degrees. (Reprinted from 

 Scribner's Pocket Table Book.) 



No. 116. WORM AND SPIRAL GEARING. Reprinted from 

 " American Machinist." By F. A. Halsey. 



