Notes And Queries, Number 190, June 18, 1853

Cover Notes And Queries, Number 190, June 18, 1853
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" Thus we obtain a levelling instrument, a chronometer, and a measure ofdistances, at a cost considerably under one penny.
The above will more fully explain to your correspondent [Phi]. (Vol. Vii. , p. 505. ) my reasons for the length of thread stated; and with respect tothe diagonal lines on the ground glass, it is not material what may be thedistance of the principal object, whether six feet or six hundred: for ifthe cross lines, or any other lines drawn on the glass, cut the centralobject in
... the picture at any particular part--for example, the window ofany particular house, or the branch of any tree, --then the camera may beremoved to higher or lower ground, several feet or inches, to the right orto the left, and the same lines be made to cut the same objects, previouslynoted; the elevation will then be the same, which completes all that isrequired.
In most stereoscopic pictures, the distances are too wide. For a portrait, two inches and half to three inches, at nine or twelve feet distant, isenough; and for landscapes much less is required than is generally given, for no very great accuracy is necessary.


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