Missouri Botanical Garden 
Ghorge Engelmann Papers 
7 3HS 
ASTRONOMICAL OBSERVATORIES. 
An observatory is almost indispensable to the profitable use 
of astronomical instruments, especially those of large size, 
and many persons are deterred from erecting one from 
an erroneous impression as to its cost. We are prepared 
to give this branch of our business special attention , and 
to erect and put in working order observatories at reason¬ 
able prices. A cheap yet efficient style is represented in 
our cut on title-page of this Catalogue . The walls may be 
constructed of wood, brick , or galvanized iron , the latter 
material being the best, as in a building of this kind the 
difference between inside and outside temperature is very 
slight. Plans and estimates furnished on data given by 
those desiring our services in this line . 
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