444: THE CENTURY, 



thejuperficies of the water the hour 

 of the day or night, never rifing 

 more out of the water then juft to 

 the minute it fheweth of each quar 

 ter of the hour ; and if by force 

 kept under water, yet the time is 

 not loft, but recovered as foon as it 

 is permitted to rife to thejuperfictes 9 

 of the water. 



9 surface. P. 



\_An Hour Water-ball.~\ The 4th article of his 

 selected list of his inventions supplies the following 

 varied reading : 



&quot; By these (his quintessence of Motion) I can make 

 a ball of silver or gold, which thrown into a pail, or 

 poole of water, shall arise again to the perfect hour of 

 any day or night. The superficies of the water shall 

 still show the hour distinctly ; even the minutes, if I 

 please. 7 See Appendix A. 



Many curious specimens of these Horologies occur in 

 the description of M. Grollier de Servi&re s cabinet, 

 published 1719. 



48. 



A fcrued Afcent, inftead of Stairs, 

 with fit landing places to the beft 

 Chambers of each Story, with Back- 

 ftairs within the Noell 1 of it, conve 

 nient for Servants to pafs up and 

 down to the inward Rooms of them 

 unfeen and private. 



1 Nocll, in the MS. 



