3 
nf emitted the correct British equivalent of the Scientific metre or the length 
throuf»h^ Parts^tn h» b h' ng the , I0 - m ! lllon ‘ h P a “ of ‘he quadrant of the Meridian passing 
39 37fo29^nches!° b 39 377,86 ,uches ’ or ’ reduced to the same standard of temperature as the legal metre, 
at tifelr^normaKemnerat 1 ” 6 the . c T“ lval ' n ‘ °‘ tha legal metre, the lengths of. the standards were compared 
at tneir normal temperature, viz.. 12 0 for the metre anH r* c* ‘i — 
. , , “ . * — — — •'•{j"* •.ivnv, iv,uguia ut me aldliUdu 
U temperature, viz., 3a 0 for the metre and 6a° F. for the standard yard. The Standards 
^^^wo^tand^d^slmuldHhe^rna^ 1 ^^ t !!! at ’ f ° r com ™ ercial purposes, it was desirable that the comparison of 
*'1° st f" d f rds ® hould be made at the same ordinary temperature of the air at 6a° F. According to this 
valuation the length of a brass metre would be 39*380203 inches. 
Table II is based on the determination by Prof. W. H. Miller, in 1844, of the weight of the French 
platfnum m pound^(^vohdupois). aCM °* t0 ^ “ IS « a '348 7 4 imperial grains, or 0-20462, a s standard 
The Troy pound has now almost become obsolete. Under the Weights and Measures Act of 1878. 
^ e ‘ gbt J? t0 . , b ?"^ d excrlusively for ail articles sold by weight, except for bullion and precious 
? t0 reti |7 *!, rl »!■ by l h n,. Tr0 i y ou " ce , or b y decimal parts of it, and for drugs which may be sold 
rtf- t?=f? e =tni e rd„ w ^! sht ' In , the latest editions of the British Pharmacopoeia the only weights 
used are the grain, avoirdupois ounce (437'S grains) and pound (7000 grains). Photographic and chemical 
2 1S1 e t P “ w a - CC ?f d . ng ‘“.Apothecaries or Troy grains, drachms and ounces, but the 
use of Avoirdupois and Metric Weights for this purpose is fast extending. 
The tables have been carefully revised in the Trigonometrical 
Branch office by Mr. W. H. Cole, M.A., Deputy Superintendent of 
Survey. 
