BAGATELLES RELATING TO THE PNEUMATIC APPARATUS. 



tin£t cotemporary founds : if the Doctor will condefcend to 

 fay, he contends for nothing more, the difpute is at an end ; 

 but fliould he reject this propofal, I advife him to attempt the 

 refutation of my paper by fober arguments, and to tranfmit his 

 thoughts to that Society which publiflied mine ; where, with- 

 out doubt, they will meet with a candid reception. 



JOHN GOUGH. 

 Middlejhazv, near Kendal, 

 December 13, 1802. 



II. 



Bagatelles relating to the Pneumatic Apparatus. Sliding Stop* 

 cock ; fimple andfccure metallic Joint for Tubes ; Improvement 

 of Read's Apparatus ; original Invention of Woulfe's Bottles 

 and Tubes; and of a Method ofclqfing VeJJels. By N. N. 



Invention of § 1. JL HE prefent bagatelle writer has been frequently at a 

 cocks? ° P ~ ^ s ' * n ms P neum atic experiments, to meet with flop-cocks 

 both cheap and perfectly air-tight, or to have them eafily re- 

 paired when out of order. In a converfation he had on this 

 fubjeft with Dr. Fifcher, ci-devant Aftronomer at Manheim, 

 he underflood that Mr. H el fen fried er, while Profeflbr of Na- 

 tural Philofophy at Ingoldfladt, to remedy fimilar defects in his 

 ' air-pumps, ufed fleel parallelopipedons with a vertical and ho- 

 rizontal opening joined at right angles, and Aiding between 

 brafs-work. This furnifhed the writer with the idea of con- 

 llrucling Hiding flop-cocks for a gazometer ; he was conflru6fc- 

 ing fimilar inflruments. He lays no claim to the invention ; 

 but has found them anfwer extremely well. 

 Defcrlption of Fig. 1. PL I. exhibits a feclion of the Aiding flop-cock put 

 the cock. together. 



Fig. 2. One of the brafs parallelopipedons (a a, Fig. 1) 

 againfl which the pieces b and c, Fig. 1, are prefTed and united 

 by means of four fcrews. 



Fig. 3. The Aider by which, when brought home on one 

 fide, the flop-cock is opened, and, on the contrary, fhut 

 when moved flufh on the oppofite extremity. 



N. B. The bore of the whole is three-eighths of an inch 

 diameter throughout, which is of the greatefl advantage, when 



* • - an/ 



