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TABLE
For converting Decimals of the Troy pound into Troy Ounces, Drams, and Grains.
lb.
0%.
dr.
grains
lb.
0Z.
dr. grains
lbs.
grains
.1
=
I
I
3 6
.01
O
■ 0 ; 57.6
.0©I
-
5.76
.2
—
2
3
12
.02 ==
O
: 1 : 55.2
.002
—
n.32
•3
—
3
4
48
.03 =
0
: 2 : 52.8'
.003
■—
17.28
•4
—
4
6
24
.04 =
0
: 3 : 50.4
.004
— '
23.04
•5
—
6
0
0
.05 =
0
: 4 : 48.0
*005
28.80
.6
=
7
1
3 6
,06 ~
0
: 5 : 45.6
.006
—
34.56
• 7
8
3
12
.07 =
0
: 6 : 43.2
.007
40.32
.8
9
4
48
.08 =
0
: 7 : 40.8
.008
—
46.08
•9
10
6
24
.09 =
0
: 8 : 38.4
.009
51.84
k
THE numerous and valuable 'refearches of French authors in every branch of chemiftryrequire a knowledge in the reader of the weights and meafures commonly employed by them ;which is more particularly neceffary as the denominations common to feveral meafures in bothcountries exprefs very different quantities both abfolutely and relatively, which fometimes leadsto very ferious miftakes. Thus the French pinte is equal to nearly two Englifh pints : the gros oreighth of an ounce contains 72 grains, whereas our dram, which is ufually reckoned as its equi-valent, contains only 60 grains : the French grain is of lefs abfolute weight than the Englifhgrain, but the French inch is longer, and hence the fame proportion does not hold in the twocountries between the meafures of weight and capacity.
The ftandards of weight and meafure were totally changed in France about the year 1794,nearly at the time that fimilar changes were introduced in the divifions of the year, but thoughthe notation of time has now returned to its ancient courfe, the fyflem of weights and meafuresappear flill to keep their ground, and are actually adopted in all chemical writings. It is highlyneceffary, however, to give the old, as well as the new fyflem of menfuration, as the moft nume-rous, and as yet the moll important, refearches, fuch as thofe of Lavoifier, Beaume, Macquer ,&c. were made before the prefent fyflem was adopted.
We poffefs very accurate ftandards of companion between the French weights and meafuresand our own, the old French having been carefully compared with the Englifh ftandards by acommiffion from the Royal Societies of each country in the year 1752; and the modern French metre having been compared with equal accuracy with the Englifh inch by Profr. Pictet in 1801.
- The old French weights and meafures are the following:
The pound (potds de marc) contains 9216 grains, and is divided into 16 ounces, the ounce into8 gros, and the gros into 72 grains: or as follows ;
grains
24.=
. 72 =576 =
4608 =9216 =:
1 denier3 = 1 gros
24 = 8 = 1 ounce
192 = 64 — 8 '— r marc
384 = 128 = 16 = 2 = pound