2 SCIENTIFIC BOOKS PUBLISHED BY 



Francis' Lowell Hydraulics. 



Tliird Edition. 



4to. aoth. $15.00. 



LOWELL HYDRAULIC EXPEEIMENTS — being a Selec- 

 tion from Experiments on Hydraulic Motors, on the Plow of 

 Water over Weirs, and in Open Canals of Uniform Eectangular 

 Section, made at Lowell, Mass. By J. B. FnAifcis, Civil Engineer. 

 Third edition, revised and enlarged, including many New Ex- 

 periments on Gauging Water in Open Canals, and on the Elow 

 through Submerged Orifices and Diverging Tubes. With 23 

 copperplates, beautifully engraved, and about 100 new pages of 

 text. 



The ■work is divided into parts. Pakt I., ou hydratilic motors, includes 

 ninety-two experimenta on an improved Foumeyrou Turbine Water- Wheel, 

 of about two hundred horae-power, with rules and tables for the constructioa 

 of similar motors ; thirteen experiments on a model of a centre-vent water- 

 wheel of the most simple design, and thirty-nine experiments on a centr&-vent 

 water-wheel of about two hundred and thirty horse-power. 



Pakt II. includes seventy-four experiments made for the purpose of deter- 

 mining the form of the formula for computing the flow of water over weirs; 

 nine experiments on the effect of back-water on the flow over weirs; eighty- 

 eight experiments made for the purpose of determining the formula for com- 

 puting the flow over weirs of regular or standard forms, with several tables 

 of comparisons of the new formula with the results obtained by former experi- 

 menters; five experiments on the flow over a dam in which the crest was of the 

 same form as that built by the Essex Company across the Merrimack River at 

 Lawrence, Massachusetts; twenty-one experiments on the effect of observing 

 the depths of water on a weir at different distances from the weir ; an exten- 

 sive series of experiments made for the purpose of determining rules for 

 gauging streams of water in open canals, with tables for facilitating the same ; 

 and one hundred and one experiments ou the discharge of water through sub- 

 merged orifices and diverging tubes, the whole being fuUy illustrated by 

 twenty-three double plates engraved on copper. 



In 1855 the proprietors of the Locks and Canals on Merrimack Hiver con- 

 sented to the publication of the first edition of this work, which contained a 

 selection of the most important hydraulic experiments made at Lowell up to 

 that time. In this edition the principal hydraulic experiments made there, 

 subsequent to 1855, have bcu added, including the important series above 

 mentioned, for determining rules for the gauging the flow of water in open 

 canals, and the interesting scries on the flow through a submerged Venturi's 

 tube, in which a lai^ger flow was obtained than any we find reo6tded. 



