tes = ; 
328 Deseription of an umproved Rain Gage. 
ter in the gage, it would, evidently, form a stratum on 
the bottom of one inch in height; and if we conceive 
this stratum to be divided, by horizontal sections, into 100 
equa! parts, these parts would form strata, each of which 
would be the ;1,th of an inch in height; and, being equal 
to a cubic inch, would weigh 222.525 grains. Let us fur- 
ther suppose that one of these strata is subdivided into 
10 equal parts by sections in the same direction, each ol 
these parts would, evidently, form a stratum of water, 
whose height would be only the ;'5;th part ofan inch; and 
being equal to the 10th part of a cubic inch, would weigh 
25.2525 grains, 
Having then, the weight of 100:cubic inches correspond- 
ing to one inch in altitude; the weight of one cubic inc 
to the ;4sth of an inch; and the ;,th of a cubic ich to the 
-aiyath part of an inch; it is easy to see that the height of 
the water in the gage may be obtained by making one, OF 
other, of the above numbers a divisor to the corrected 
weight of the water, in troy grains. But this trouble 1s 
rendered unnecessary by the use of the following '- 
bles :-— 
“Taste 1. Troy Weight. | Tapue 2. For Reducing 4 
Grains. 
One pound troy, = 5760 voirdupors ee th 
One ounce, = 480; One pound. avoirdu- 
One drachm, Le Ot eA ois, = 7000 
One scruple,, = 20 | Half pound, .. = 3500 
; _4iofa pound, = 1750 
Two ounces, = 879 _ 
One ounce, = 437-9 
Halfounce, = 21875 
= 109.375 
Quarter ounce, 
