H YG 
HYP 
235 
together with 
Hygrometer. Letter of a contrivance of an 
common hygrofcope - j 
■ A defer iption of his hygrofcope in two fe 1 
contrivances ; 
made thereon 
« ■ A letter concerning a new hygrofcope invente 
by - Molyneu 
— Defcription of the hygrometer Pickerii 
— Extra#: of a letter deferibing an improved h) 
grofeope - - Arden. 
— Part of a letter concerning an improvement < 
the weather cord - Arden 
— — The defcription of an hygrometer made of 
deal rod - - Arden 
— Thejdefcription of a new hygrometer invente 
by Ja?nes Ferguji 
Defcription of a new hygrometer Smeati 
Account of a new hygrometer De L\ 
HygroscoPE See Hygrometer, 
Hyoscyamus Albus. TheefFe#sof the hyofeyamt 
albus - * StedmCi 
Hyperbola. The fquaring of the hyperbola by a 
infinite feries of rational numbers; togethi 
with its demonftration - Srouncki 
— — Anfwer to the animadverlions of Mr. Hugenii 
upon Dr. Gregory’s book De vera circuli < 
hyperbolae quadratura, as publifhed in the joui 
nal Des Scavans - Gregor 
> ■ ■■• Some confiderations upon M. Hugens’s lette 
printed in vindication of his examen of th 
dratura - - Gregc 
The generation of an hyperbolical cylindrc 
demonftrated, and the application thereof, f 
grinding hyperbolical glafles, hinted at W r 
A defcription of Dr. Chr. Wren’s engine, d 
figned for grinding hyperbolical glafles, as 
was in a manner promifed, vol. III. p. 962 
- Wr 
On the center of gravity of hyperbolas JVal 
A compendious and facile method for conftru£ 
ing the logarithms, exemplified and demoi 
ftrated from the nature of number , witho 
any regard to the hyperbola ; with a fpeec 
method for finding the number from the log 
rithm given * * Halt 
Tranf. 
1- 
Abridg. 
». Xi 647 
al 
is 
11 36 
r f — 715 
d 
— 37 
x XV 1032 
g XLIII 6 
—'40 
XLIV 95 
>f 
X 4 S 3 
n — 169 
a 

m — 184 
d 
m LIV 239 
m LX 1 198 
u LX III 404 
is 
n XLVII 194 
n 
:r 
“ 454 
r III 645 
is 
k 
y — ■ 732 
e 
I 10 
■y — 882 
d 
r 
— 407 
« IV 961 
t 
— 188 
n — 1059 
s VII 5074 
t 
f 
— 189 
y XIX 58 
— ieS 
5 
The 
