[ 291*3 
debced. And befides this, to each Star are added Bayers 
Letters of Reference *, a Circumftance extremely ufeful, 
either for the tracing out the Path of a Comet, or for de- 
fending any new Phenomenon in the Heavens. 
It may be further obferved, that Celeftial Globes, as they 
are commonly fitted up, are adjufted only to one particular 
Year-, though indeed they may ferve without any fenfible 
Error, during the Life of any fingle Perfon whereas 
mine,, particularly the two greateft, viz. of 17 and 28 
Inches in Diameter, have this further Advantage, that 
they ferve indifferently for any Age paftor to come. For 
by means of a Nut and Screw, which will be hereafter 
deferibed, the Globe is made to turn round an Iron Axle i 
whereby the Pole of the Equator (though fixed in common 
Globes) is made here to revolve about the Pole of the Eclip- 
tic, and reprefents the flow Motion forwards obferved 
among thefixed Stars, but really owing to the flow Motion 
backwards of the Equinoctial Points. 
Upon this Account it is, that theConftellation of Aries is 
got into the Sign of Taurus, and the Conftellation of Taurus 
into that of Gemini , and fo of the reft. Hence likewife it is, 
that Stars which rofe or fet at particular Seafons of the Year 
in the times of Hejiod , Eudoxus , Virgil , Pliny , &c. by no 
Means anfwer at this Time to their Defcriptions -, but by 
the Improvement I am here fpeaking of, my Globes 
(allowing for the Preeejfon of the Equinox , as it is called, 
i. e. one Degree in feventy-two Years) may, without’ any 
Trouble, be adjufted to the Accounts given by any of 
thofe Writers. 
By this means likewife, every one may judge' of the 
Truth of ancient Obfervations without the Labour of a 
tedious Calculus , which fome are not able, and others are 
not willing, oratLeifure, to go through. By this means 
likewife, fome Paflfages in thole ancient Writers may be 
corrected, when Manufcripts afford no Afiiftance. For 
thefe frcqueutly fuffer by the Hands they go through, 
whilft the Heavens remain invariably the fame. 
As 
