Manufacture of Tin-Plate.' 151 



When the wash-man has passed^ue of the plates through the 

 melted tin, and from thence into the pot of tallow above-men- 

 tioned, a boy takes out one of them and puts it into the empty 

 pot to cool, and the wash-man puts in the sixth plate. The boy 

 then takes out a second plate, and lays it to cool likewise, when 

 the man puts in his seventh, and so they go on, in this regular 

 manner, until the whole of the parcel is finished. 



In consequence of the plates being immersed in the melted 

 tin in a vertical position, there is always, when they have become 

 cold, a wire of tin on the lower edge of every plate which is ne- 

 cessary to be removed, and this is done in the following manner : 



A boy, called the list-boy, takes the plates when they are cool 

 enough to handle, and puts the lower edge of each, one by one, 

 into the list-pot, which is the vessel that was before described as 

 containing a very small quantity of melted tin, and the same as 

 that which I have marked No. 5. When the wire of tin is melted 

 by this last immersion, the boy takes out the plate, and gives it a 

 smart blow with a thin stick, which disengages the wire of su- 

 perfluous metal, and this falling off, leaves only a faint stripe in 

 the place where it was attached. This mark may be discovered 

 on every tin plate which is exposed for sale ; the workmen, in 

 the manufactory of them, call it the list. 



Nothing now remains but to cleanse the plates from the tal- 

 low. This is done by means of bran, and as they are cleansed 

 they are put into strong wooden boxes, or boxes of sheet-iron, 

 made exactly to fit them ; and this completes the whole business. 



Art. XIV. Miscellaneous Intelligence. 



I. Mechanical Science. 



% Astronomy, Navigation, Agriculture, Sfc. 



1. New Comets. — M. Pons, of the Observatory at Marseilles, 



discovered on the 12th June, a comet in the constellation of 



Leo; it was very small, being invisible to the unassisted eye, 



and without any appearance of tail. M. Blanpain, was able to 



observe it on the 13th, 14th, 15th, 16th, and 19th of the same 



month; on the 13th at ll*" 13' 11' mean time, counted from 



