i Spey. 
machine of the kind, contrived a very ufeful one, 
on Mr. Edegworth’s principle; you defired me 
again to try if could not render it fill more per- 
fect, and, if fuccefsful, to fend a fpecimen to the 
Repofitory at Hetling-Houfe. 
As in mechanics, the previous afcertaining a 
defect is as neceflary to improvement as, in phyfick, 
the determining on the exiftence of a difeafe to its 
cure, I have ventured to fubmit the annexed fpeci- 
men for the infpection of the Committee, hoping 
fome one will ftill point out the improvement I do 
not fee, and, purfuing the fame to effect, render it 
ftill more deferving the regard of community. 
In conformity to the fimplicity above-mentioned 
of Mr. Edgworth’s Pedometer, he found it neceflary 
to attempt nothing more in its operations, than the 
meaturing roads, diftances, &c. and even for this, 
unlefs where the ftones had previoufly been broken, 
and the roads worn {mooth (inftances for any con- 
tinued length rarely to be met with) I found it, on 
trial, very inadequate. 
In the fpecimen.I have now fent you, nothing 
has been omitted to the rendering it capable of 
meafuring roads in general, with greater facility, 
accuracy, and expedition, than may be done by any 
other mode I have feen or heard of; while it alfo 
equally excels in the furveying or meafuring of 
Jands. By the common mode of meafuring thefe 
by Gunter’s, or any other chain, the progrefs (com- 
paratively 
