f 



I'iition to the exercises given in this work the student 

 should practise making freehand sketches of ""^int detail* 

 or good mod .-m. Upon thnsn 



ftkctchm he ihould put the proper dimensions, got by direct 

 measurement fnuu the inu< him- or >:..!. 1 I iy lutntelf. These 

 sketches ahould be made in a note-book I..- purpose, 



and no opportuiu' i ije loat of inierting a sketch of any 



design which may be new to the student, always putting 

 the diroensio -isible. These sketches form . 



- from whi -h to make working drawings. Th 

 should also note any rules which he may meet with fur pro- 

 portioning machines, taking care, however, in each case to state 

 source of su<-h mi r his future guidance and 



r ! i : : t 



As machine drawing is simply the application of 

 l>rin< iples of dfs to the representation of 



nuul : the former subject, if he U 



already acquainted with tl umonce to stu<ly 



D. A I 



THE KKlUTll K 7)777' 



To this edition many new illustrations and exercUea have 

 been added, and the whole work has been thoroughly revised 

 nnd improved, in order that it may more folly dcner 

 popularity which it has already gained. 



Loxoox : Jn/y. 1806. 



