The Steel Square and Its Uses. 



The Carpenters' Steel Square and its Uses ; being a de- 

 scription of the Square, and its Uses in obtaining the 

 Lengths and Bevels of all kinds of Rafters, Hips, Groins, 

 Braces, Brackets, Purlins, Collar-Beams, and Jack- 

 Rafters. Also, its application in obtaining the Bevels 

 and Cuts for Hoppers, Spring Mouldings, Octagons, 

 Stairs, Diminished Stiles, etc., etc., etc. Illustrated by 

 Over Fifty Wood-cuts. By Fred. T. Hodgson, Editor 

 of the " Builder and Woodworker." 

 Cloth, Gilt, - - 75 cents. 



Mechanical Draughting. 



The Students' Illustrated Guide to Practical Draughting. 

 A Series of Practical Instructions for Machinists, Me- 

 chanics, Apprentices, and Students at Engineering 

 Establishments and Technical Institutes. By T. P. 

 Pemberton, Draughtsman and Mechanical Engineer. 

 Illustrated with Numerous Engravings. 



Cloth, Gilt, - - $1.00 



This is a simple but thorough book, by a draughtsman of twenty- 

 five years' experience. It is intended for beginners and self-taught 

 students, as well as for those who pursue the study under the direc- 

 tion of a teacher. 



Map of the Moon. 



This is a copy of Webb's reduction of Baer & Maedler's 

 .' celebrated Map of the Moon. It is engraved in the very 

 best style, every feature being remarkably clear and dis- 

 .tinct. It is accompanied with a small book, which con- 

 tains a description of the various topographical features 

 shown in the map, and forms an indispensable addition 

 to the library of every Amateur Astronomer. Price of 

 Map and Descriptive Book, - - 50 cents. 



SS~ As the map was prepared for the purpose of illustrating the 

 monthly papers on "Astronomy for Amateurs," published in the 

 YOUNG SCIENTIST, it was given as a premium to all subscribers to 

 that journal. Those who received the map with the Journal, and 

 desire to procure the book, can obtain the latter, post-paid, for 20 

 cents. 



