Description of an Apparatus, Zjfc. 217 



plug, in its whole length, is nine inches, and has a hole 

 made in its broad part H^ through which the oval iron ring 

 B passes easily, and on which the plug can move backwards 

 and forwards, when the ring is hung upon the hook of the 

 lower pulley block of the lifting tackle. CCCC represent 

 the four leg?, or frame-work of the quadrangle , D a five-fold 

 tackle, with blocks ten inches in diameter; Ea roller seven 

 inches in diameter, turned by two long iron levers bb; the 

 handle I is used as a safeguard, and to assist to regulate the 

 power of the levers. In fig. 1, the plug A is shown fixed 

 in the stone K, ready to draw it out of the ground, by means 

 of the lifting tackle. 



N. B. The hinder legs of the quadrangle are made to close 

 in between the fore legs, for the convenience of carnage. 



XXXVII. Description of on Apparatus for making Car- 

 bonated Hydrogen Gas from Pit Coal, for the Purpose of 

 lighting Factories therewith. By Air. Samuel Clegg, 



of Manchester*. 



DEAR SIE, 



VV hen your son was in Manchester, he called to see my 

 nephew's, Samuel Clegg's, improved gas lights, and was 

 desirous to have a plan of his method, which my nephew 

 promised to him, and I undertook to get it conveyed to you. 

 I have, accordingly, taken the opportunity of sending to 

 the Society of Arts, &x., a plan and explanation of his ap- 

 paratus. 



He lighted a large factory in Yorkshire some years ago 

 upon this principle, and has since lighted some buildings in 

 this neighbourhood, and I believe he is the first person who 

 succeeded in rendering these lights free from the offensive 

 smell which generally accompanies them. My nephew 

 served an apprenticeship to Messrs. Boulton and Watt, of 

 Jiirmingham, in the steam-engine business, in which he is 



* From Transactions of the Society for the. Encouragement nf Arts, Manufac- 

 ture, and Commerce, for 180S. The silver ruedU of the Society was voted 



to the author. 



now 



