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This Camera he mentions not only as a great Help 
to him, by giving true Proportions and Outlines, but 
likewife for a more fpeedy difpatch ; doing more this 
way in one Day, than could poffibly be done with- 
out in feveral. 
It is a long fquare Tube fet upon two Treffels 
(as reprefented in the Print before his Book) whofe 
Intide is made black, to prevent the Refle&ion of Light j 
towards that End which is neareft the Objed, is a con- 
vex Glafs placed in a Aiding Frame, thro* which the 
Rays palling from the Objeft, converge and meet in 
a Focus; upon the Table-Glafs placed near the other 
End, analagous to the Cryftalline Humour and Re- 
tina in the Eye. 
The Objeft here reprefented is the Trunk of a 
Skeleton fix’d to a Painter’s Ezel, which being in- 
verted, appears upright on the Table-Glafs, on the 
rough Side of which the Artift delineates with a 
Pencil, which afterwards he traces off on Paper. 
The Convex Gl.tfs placed in the Aiding Frame being 
moved backward or forward, makes the Object big- 
ger or lefs, keeping its due Proportions. 
This Camera has feveral Advantages beyond the 
common one ; for in this, Objeffs as big as the Life 
may be taken, or reduced gradually to any Scale ; 
whereas the other only diminilhes, and that in a very 
great Degree. 
In this Work the gradual Increafe of the Bones is 
defcribed, even from the firfi Stages of OAIfication, 
to that of an Adulr, when every Bone is reprefent- 
ed as large as the ’Life in different Attitudes ; as like- 
wife tnoft of the Bones faw’d through the Middle, 
to ftiew their internal Texture : And in order to Ihew 
how 
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