HEiniY CAPtEY BAIRD'S PUBLICATIONS. 



Perkins — Practical Treatise on Gas and 



Ventilation. 

 By E. E. Perkins. 12mo. (In press.) 



Practical Printer, Type Founder, and 



Stereotyper^ s Hand-Boole. 

 By D. W. Belisle. Illustrated. 12mo. (In press.) 



Practical [The) Surveyor'' s Ckdde: 



Containing the necessary information to make any person of 

 common capacity a finished Land Surveyor, "without the 

 aid of a teacher. By Andeew Duncan, Land Surveyor 

 and Civil Engineer. 12mo 75 cts. 



Having had an experience as a practical Surveyor, &c. of thirty years, it is 

 believed that the author of this volome possesses a thorough knowledge of the 

 wants of the profession; and never having met with any work sufiBciently con- 

 cise and instructive in the several details necessary for the proper qualification 

 of the Surveyor, it has been his object to supply that want. Among other im- 

 portant matters in the book, will be found the following : 



Instructions in levelling and profiling, with a new and speedy plan of setting 

 grades on rail and plank roads ; the method of inflecting curves ; the descrijv 

 tion and design of a new instrument, whereby distances are fouud at once, with- 

 out any calculation ; a new method of surveying any tract of land by measur- 

 ing one line through it ; a geometrical method of correcting surveys taken with 

 the compass, to fit them for calculation ; a short method of finding the angles 

 from the covirses, and vice versa ; the method of surveying with the compass 

 through any mine or iron works, and to correct the deflections of the needle by 

 attraction ; description of an instrument by the help of which any one may 

 measure a map by inspection, without calculation ; a new and short method of 

 calculation, wherein fewer figiues are used ; the method of correcting the diur 

 nal variation of the needle ; various methods of plotting and embellishing maps ; 

 the most correct method of laying off plots with the pole, &c. ; description of a 

 new compass contrived by the author, &c. &g. 



Rail Road Curves, and Location of Rail 



Roads : 



A Practical Treatise. By E. W. Beans, Civil Engineer. 12mo. 

 (In press.) 



Rural Chemistry: 



An Elementary Introduction to the Study of the Science, in its 

 relation to Agriculture and the Arts of Life. By Edward 

 Solly, Professor of Chemistry in the Horticultural Society 

 of London. From the third improved London edition, 



12mo $1.25 



11 



