THERMOMETRY. 
497 
sive) ones ; and thus it is infinitely better for an intending 
meteorological observer of limited means to concentrate his 
funds on the acquisition of one or two really good instruments, 
than seek to obtain an imposing show of worthless ones, 
always supposing that he desires to work for the benefit of 
science ; — but we are digressing. 
Pyrometer is the name applied to certain forms of heat- 
measurers designed to register extreme temperatures, rising 
to hundreds or thousands of degrees, heat which, as the name 
imports, is only met with in fires and furnaces. A good pyro- 
meter is still a desideratum ; and as, besides this, they are only 
required for use in factories and for processes in the arts, no 
good purpose would be served by entering into any remarks 
on them in a popular article like the present. 
