372 Salem Manufacture of Alum, &c. 
‘Perhaps it is not generally known, that in one of our vil- 
lages, excellent thermometers, of every variety of construc- 
ion, may be obtained. ‘They are the work of a self taught 
artist, Mr. Thomas Kendall Jr. of New Lebanon, whose in- 
_. genious device for graduating tubes of unequal bore, is men- 
tioned at pa. 398, Vol. 4, of this Journal.* We have sev- 
eral of Mr. Kendall’s thermometers, constructed for partic- 
- ular purposes, and with which, as regards both the neatness 
and accuracy of their execution, we have every reason, to be 
well satified. Some of them are particularly convenient, as they 
are constructed with naked balls, and with the contiguous part 
of the tube descending below the scale, which fits them for im- 
mersion in liquids, at the same time that they are conven- 
iently packed in travelling cases, and will answer well for 
chemical, medical, and meteorological observations. 
We are assured that upon Mr. Kendall’s plan of gradua- 
tion, if the bore of a tube is of a regular taper, there is no 
more difficulty in making a correct thermometer of it (even 
if it varies so much, that the space necessary for three de- 
grees at one end makes but two at the other,) than of one 
that is uniform throughout. 
he substance of Mr. Kendall’s improvement, we under- 
stand to be, a method of dividing right lines into any number 
of parallel divisions, with equal ease and accuracy, whether 
equal or unequal: applicable to the manufacture of mathe- 
matical instruments, but more particularly to the graduation 
of thermometer scales, which almost universally require un- 
equal divisions. This method may also be applied to the 
division of circles, and would be of great use to the artist 
in manufacturing machinery which required a great number 
and variety of cogs, as with an engine constructed on this 
principle, one number would be as easily obtained as 
another. —Ed. | 
9. SalemManufacture of Alum, &e. 
We contemplate with particular satisfaction, every ad- 
vance made in our domestic arts and manufactures, and re- 
_ * Tt will not diminish the value of that notice, if we mention, that it was 
Bs et by the late Professor Fisher, after mature consideration of the sub- 
ect. 
