360 Notice of certain processes in the Aris. 
tained at the openings of these tubes, and the flame from the 
gas-burners is drawn forcibly upwards, so that it passes di- 
rectly through the meshes of the muslin, and is seen as dis- 
tinctly above the web as below. This contrivance also 
serves to convey off the smoke produced by the burning 
fibres of the cotton, and which was formerly very disagreea- 
ble, and even distressing. The finest muslins are passed 
through this machine twice, once for each side, and the 
coarser four times. They rarely take fire, although the mo- 
tion is by no means rapid and the improvement in the smooth- 
ness and texture, is obvious to the most inexperienced eye. 
In passing over the flame it is sustained by bands of fine 
twine at the distance of an inch from each other, and it is 
surprising to observe that after passing for months in succes- 
sion over the flame, they experience no change butthe ac- 
cumulation of tar from the gas. 
Bleaching Powder, Sulphuric Acid, Alkahes, dre. 
Twas much interested in the manufactory of Mr. Charles 
‘Fennant, near this town, whose personal liberality and intel- 
ligence are not less gratifying than the results of his ingenui- 
ty. The original object was the manufacture of the bleach- 
ing powder now so extensively used; but he has combined 
several others with it, in a manner which materially contributes, 
to the success and profit of the whole. The buildings of 
the establishment cover a space of five or six acres. One 
large section is devoted to the manufacture of sulphuric 
acid. The nitre, instead of being combined with the sulphur 
in this operation is placed in a separate portion of the furnace, 
and its gas is evolved by the heat of the burning sulphur. 
‘There are thirty furnaces and an equal number of leaden 
chambers, seventy feet in length, twenty in breadth, and six- 
teen in height, for the condensation of the acid, which appear 
as if they were competent for lodging the inhabitants of a 
village. A large part of this acid is employed in the pro- 
duction of chlorine for the use of the manufactory, and is 
therefore condensed only to the degree necessary for this 
process. The remainder is rectified by distillation in platina 
retorts. There are nine of these vessels holding fifty gallons 
each, and weighing 500 or 600 ounces. Their value cannot 
be estimated at less than $2500 each, or $22,500 for the 
whole, and yet itis believed to be more economical than, te 
employ the perishable vessels of lead. Mr. Tenstant in- 
