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XXXIV. Defcription and Ufe of a portable Wind Gage, 
By Dr. James Lind, Phyfician^ -at Edinburgh. 
K-edde, May ii,K f fimple inftrument confifls of two 
1775. H 
glafs tubes ae, cd, of five or fix inches 
in length (tab . x . fig. i .) . Their bores, which are fo much 
the better always for being equal, are each about ^^ths of 
•an inch in diameter. They are conne6ted together, like a 
fiphon, by a fmall bent glafs tube ab, the bore of which 
is -j^th of an inch in diameter. On the upper end of the 
leg AB there is a tube of latten brafs, which is kneed or 
bent perpendicularly outwards, and has its mouth open 
towards f. On the other leg cd is a cover, with a round 
hole G in the upper part of it, ^^ths of an inch in dia- 
meter. .This cover and the kneed tube are connedted 
together by a flip of brafs cd, which not only gives 
ftrength to the whole inftrument, but alfo ferves to hold 
the fcale hi. The kneed tube and covfer are fixed on 
with hard cement or fealing wax. To the fame tube is 
foldered a piece of brafs e, with a round hole in it, to re- 
ceive the fleel fpindle kl, and at/ there is juft fuch ano- 
ther piece of brafs foldered to the brafs hoop ^>6, which 
furrounds both legs of the inftrument. There is a fmall 
fhoulder on the fpindle at/, upon which" the inftrument 
B b b 2 refts-, 
