( z8o ) 
An Explanation oj the TABLES. 
The firft Column contains the Month ; the fecond Column 
is the Day of the Month j the third the Hour of the Day, 
beginning at Six in the Morning, to Twelve at Noon, and 
Nine at Night \ the fourth Column is that of the Thermolcope j 
the fifth Column is the Height of the Mercury in the Baro- 
icope, the firft Number is the Inches of its Height, the fecond 
and third Number marks the tenths and hundredth Parts of 
an Inch ; the fixth Column is the Latitude the Ship is in, by 
Account, every Day at Noon ; the feventh Column is the 
Longitude the Ship is in every Day at Noon, by Account, from 
the Meridian of London (except where otherwife exprefs’dj. 
The Column Variation, is the Variation of the Needle ■, and 
the next four Columns are the Latitudes obferv’d at Noon by 
four feveral new Inftruments ; the firft is Mr Smith’ % Prifmatic 
Quadrant, the fecond is Mr. Hadley’s, the third by Mr. John 
Elton , and the fourth by Mr. Caleb Smith and Mr. William 
Ward i the next Column is the Wind for the moft Part of 
the Twenty-four Hours. 
The Thermofeope which I made ufe of in the Voyage, was 
made by Mr. John Patrick, together with the Barofcope ; in 
his Thermofcope he places [°] at the Top, fuppofing it to be 
the Heat under the Line, and fo the Figures increafe down- 
wards, with the Increafe of Cold. Temperate is placed at ay. 
This Prifmatic Quadrant of Mr. Caleb Smith I find to be of 
very great Ufe at Sea, in particular for the Stars, as I have ex- 
perienced feveral times in my Voyage to Hndfon’s Bay , in the 
worft of Weather, when you can but fee the Horizon ; and 
his other is of great Ufe, in tolerable fin ooth Water, in foggy 
and hazy Weather, when there is no Horizon to be feen, yet 
have the Benefit of the Sun. 
V. An 
