Description of a Perspective Instrument . &59 
ianique, on his late return from London to Paris, pre- 
sented various instruments brought from this country to 
the National Institute of France. Among them was the 
instrument here to be described, and since published in 
the Bulletin des Sciences ; on inspection of which my at- 
tention was excited to my notes, where, among other 
communications to be made to my readers, I find this 
instrument, as published in the excellent work “On 
Practical Education/* by Maria Edgeworth and her fa- 
ther, to whom I have ascribed the contrivance in the 
title. The authors of the Bulletin affirm, that it was 
invented and executed by the children under the pa- 
rental care of Miss Edgeworth ; but I find no such in- 
timation in the original work. The instrument of pro- 
fessor Pictet is in various respects inferior to that which 
I have here copied ; insomuch that citizen Cloquet has 
proposed an amendment, for giving the index an hori- 
zontal position when it is required to transfer the ob- 
servation to paper, which is in fact less effectual than 
the provisions made for that purpose, and for fixing 
the true instrument. After this preface, I shall proceed 
to copy without farther remark, page 460. 
“An early use of a rule and pencil, and easy access to 
prints of machines, of architecture, and of implements of 
trades, are of obvious use in this part of education (me- 
chanics). The machines published by the Society of 
Arts in London, the prints in Besaguliers, Emerson, le 
Spectacle de la Nature, Machines approuvees par V Aca- 
demic, Chambers’s Dictionary, Berthoud sur l’Horlo- 
gerie, Dictionaire des Arts et des Metiers, may in suc- 
cession, be put into the hands of children. The most 
simple should be first selected, and the pupils should be 
accustomed to attend minutely to one print before another 
is given to them. A proper person should carefully point 
