metallic works*, who give me grt^at encouragement by their 

 signatures and SHnctiou, and 1 hope it wih meet witti the 

 Society's approbation. 



I am, Sir, 

 Your most obedient and hnmble servant, 

 J.D.ROSS. 



Reference to 3Ir. floss's Machine for separating Iron 

 I'ilin^sfrom those of Brass y or other Metals, Figs. .} afids^ 

 PI. IV. - . 



Description of A is an axis of brass, and B a handle upon the end of it: 

 the machine. (]; jg y piece of brass in ^jrm of un anchor, at each end of 

 ^hjch a ho»;se-slK»e rnaj^oiet. is £xed, in the manner shovyn 

 at 6g^ 1, where c-is the. arch of th^, anchor, and d a piec,e^ 0"^ 

 brass having a hole through it to raqeiye the legs eep(^he 

 magnet, which is fixed to the aich by a screwy, tapped into 

 the arch. Tlie anchor is mounted upon the pivat^ of the 

 axis A, in a frame E, which encloses it; on the outside of 

 the frame are two biocks of wood, FF, in each of which 'a 

 hollow or tray is formed to receive the filing^ which- aref 

 to be separated from the iron they contain in thies'e "hoUbv^si 

 Its mode of The magnets iixed at the ends of the anchor fe'trtke-upoh tli€ 

 •peration. filings,and sijlecf, by the magnetickti! action, all the lYbti 

 'among them; the'ahchor is then turned over by tlife haoflfe 

 B, ai'id the opposite magnet striked iii the other hollow. Fv 

 At thi?; time the oth^f magm&t is jast Over thie tixis, and' by 

 the jerl< of its opposite striking the block F, the iron-filingfl 

 are shukeri '6it,4^d t'«!l down oti ihe 'bottom 'fef the frames 

 or receiver. lH'''this manner the lTiJhdi^B,beiiTg ^ moved 

 backwards -and forward's, stnkes the-'miij;i?etri' alternately in 

 the t^vo blox'ks F^ and at the same ^iiii>e -that' bne strik-es, 

 the opposite is c^leared fr<)m thi: hbfi it has •'picked up by iht 

 shock. •■■© is a screeii 6f thin bda^3rtfS' pt<?veiit fhe ^fi'lifig* 

 being Scattered.' ■-,,•■ 'r ^ ^ r r-, a '.n^airu-ii -^ih yd nsvrj- 



♦Eleven dVfFereftl persons GentifterfpttiitJthay. consider Mr<- 'Bosses kli 

 irttntioD'of a mactunefbr separatijig iroc-^lir^gs, tjiraings, &c., 'itpsm tliose 

 of brr.!^s^ or finer metals, as likely to Jirove extremely useful in variou* 



branchcf.'of\V6rkers in metal. ■ •' ' ■ ■< 



