THE NEW NATIONAL STAND AED OF LENGTH, AND ITS PEINGTPAL COPIES. GG3 
with it. From these scales, the measuring apparatus was constructed, with which tlie 
bases of the English Trigonometrical Survey were determined. I refer to Kater’s 
Memoir, Philosophical Transactions, 1821, p. 75, and to Appendix No. 1, with respect 
to this operation. 
“ RAi\iSDE]sr’s scale is lost. Roy’s scale was compared by Sir G. Shuckburgh with his 
own scale, very unsatisfactorily*, and Kater has shown the result to be worthless. 
Kater’s comparison, in 1821, agrees very well with Roy’s own account of it, viz. that it 
was made for Graham, who would probably follow his own Tower Yard E more scrupu- 
lously than Bird thought it necessary to do. 1 have not compared Roy’s scale, as I 
consider Kater’s comparisons with the Imperial Standard in 1821 not satisfactory by his 
own showing in the Memoirs of 1826 and 1830 : Baily did not compare Roy’s scale at 
all with the Imperial Standard. 
“ 1 have not looked after Kater’s standards of 1826, because they only profess to be 
exact copies of Shuckburgh’s scale, and he has thrown doubt on the relation of Shuck- 
burgh to the Imperial Standard in his memoir of 1830. 1 object strongly to his mode 
of measurement, i. e. resting the apparatus upon the scale to be measured. On this 
account also I reject Dolloxd’s scale, though it was compared directly with the Imperial 
Standard. The most favourable tj^pe of Kater’s yard is the scale which he made for 
the Royal Society in 1831. 
“ The Royal Astronomical Society’s tubular scale, and two other scales of the same 
construction for the Danish and Russian governments, were compared by Baily with 
the Imperial Standard, I give, in Appendix No. 2, reasons why I have not admitted 
the Royal Astronomical Society’s scale in these comparisons. 
“ The scales I have actually compared with the Brass bar No. 2 are as follows : — 
in. in. 
Sir G. Shuckburgh’s scale 0 — 36 
Sir G. Shuckburgh’s scale 10 — 46 
r G raham’s Tower Yard E. 
All on the same barj Graham’s Exchequer Yard. 
[Yard nearly same as E, but anonymous. 
Kater’s Royal Society’s scale. 
Ordnance Iron Bar, Al. 
Ordnance Iron Bar, A2. 
“ The du’ect comparisons with the Imperial Standard made by Baily and others in 
1834 are not very satisfactory. The comparisons between the Imperial Standard and 
* “He compares the successive feet of Eot with the 12 inches of his own scale, 12'"' . .21’"-, and finds, 
assuming his own foot to he correct, that 
Eox 36 inches =35‘"' ‘9999 SntrcKBTJKGn. 
But this foot is, according to his own account, less hy 0‘"- 00006 than the mean foot of his scale, and less 
by 0'“- 00013 than the mean foot of the yard from 0'"' . . 36*"'. He also says, p. 178, that 
Eot 42 inches =42‘«’ -00010 of Shuckbuegh. 
Kateb, on the contrary, makes Eot 36 inches=SHUCKBUB,GH 36‘"'’0009, and is, I doubt not, nearly right.” 
4 R 2 
