DENSITIES OF THE TROY POUNDS CONSTRUCTED IN 1758. 
805 
If U, the lost standard, be supposed to have the same density as V, the volume of 
U at 0° C. will be equal to the volume of 706-676 grains of water of maximum density, 
Sp U — 0-00857 grain in air (^= 18-68, 6=754-93). 
RS-U — 0-00205 grain in air (^= 18-74, 6 = 757-06). 
Sp displaces 0-32544 grain, U displaces 0-84646 grain of air. Therefore 
Sp=U — 0-52956 grain. 
RS displaces 0-32629 grain, U displaces 0-84865 grain of air. Therefore 
RS=U— 0-52441 grain. 
The density of V is nearly the average density of brass or bronze weights, as 
appears by the following list, which includes all the determinations of densities of 
such weights I have been able to find. The specific gravities of the Russian weights 
and of some others marked (K), taken from the second volume of Kupffer’s work, 
entitled ‘Travaux de la Commission pour fixer les Mesures et les Poids de I’Empire 
de Russie,’ are reduced from 13°-33 R. to the specific gravity as defined by Bessel, by 
the addition of 0-002. Those marked (M) are from my own observations. 
Russian lb. No. 8 (K) 7-872 
Russian lb. No. 9 (K) 7-872 
Russian lb. No. 7 (K) 7-882 
Russian lb. No, 6 (K) 7-932 
Prussian divided pound (K) 7‘952 
Russian lb. (K) 7*972 
G lb. No. 21 (M) 7-974 
Russian lb. No. 5 (K) 7*992 
Schumacher’s troy pound K 7*994 
59 lbs. No. 9) 12 to 71 (K), all nearly 8'0 
Kilogramme, Modena Trans, t. xxv 8‘025 
Klaproth’s kilogramme, Berlin Trans. 1825. 8-055 
G lb. No. 5 (M) 8-06l 
G lb. No. 16 (M) 8-073 
Russian troy pound (K) 8-092 
G lb. No. 25 (M) 8-101 
G lb. No. 17 a (M) 8-117 
G lb. No. 7 (M) 8-122 
G lb. No. 28 (M) 8-126 
Kew lb. marked 7000 (M) 8-128 
Swedish pound (K) 8-132 
Kilogramme, electro-gilt (M) 8-133 
G lb. No. 24 (M) 8-142 
Russian lb. No. 1 (K) 8-142 
Steinheil’s divided kilogramme, Munich Trans. 8-150 
G lb. No. 23 (M) 8-151 
Mr. Vandome’s troy pound V, 1758 (M) 8-151 
G lb. No. 30 (M) 8-153 
G lb. No. 26 (M) 8-153 
G lb. No. 27 CM) 8-162 
Russian lb. No. (2) (K) 8-162 
G lb. No. 8 (M) 8-163 
Gib. No. 29 (M) 8-186 
Russian lb. No. 3 (K) 8-192 
G lb. No. 22 (M) 8-198 
Kew Standard lb., electro-gilt (M) 8-204 
Schumacher’s troy pound Sb 8-228 
Russian lb. No. 4 (K) 8-272 
G lb. No. 10 (M) 8-283 
G lb. No. 6 (M) 8-287 
G lb. No, 18 (M) 8-303 
G lb. No. 3 (M) 8-304 
Mr. Barrow’s lb., electro-gilt (M) 8-310 
Bank troy pound B, 1758 (M) 8-317 
G lb. No. 12 (M) 8-319 
Kilogramme (M) 8-320 
G lb, not numbered (M) 8-320 
Exchequer kilogramme (M) 8-328 
Russian divided lb. D (K) 8-332 
G lb. No. 19 (M) 8-340 
G lb. No. 2 (M) 8-341 
Mint troy pound M, 1758 (M) 8-349 
G lb. No. 14 (M) 8-349 
Exchequer 10 lb., electro-gilt (M) 8-354 
G lb. No. 15 (M) 8-.361 
G lb. No. 1 (M) 8-361 
Gib. No. 11 (M) 8-363 
G lb. No. 4 (M) 8-365 
Weight of 6400 grains (M) 8-368 
Russian lb. M (K) 8-373 
Alchorne’s troy pound O, 1758 (M) 8-403 
Mint 10 troy ounces, electro-gilt (M) ..... 8-414 
G lb. No. 13 (M) 8-413 
Exchequer 10 troy ounces, electro-gilt (M) ... 8-460 
Electro-gilt lb. No. 35 (M) 8-470 
Electro-gilt lb. No. 32 (M) 8-470 
Electro-gilt lb. No, 33 (M) 8-479 
An electro-gilt lb. (M) 8-481 
Electro-gilt lb. No. 36 (M) 8-496 
An electro-gilt lb. (M) 8-507 
Russian lb. N (K) 8-508 
Electro-gilt lb. No. 34 (M) 8-512 
Electro-gilt lb. No. 31 (M) 8-514 
G lb. No. 20 (M) 8-558 
G lb. No. 17 b (M) 8-558 
5 N 2 
