PHILOSOPHICAL 
TRANSACTIONS. 
Maj 10. i65p. 
The Contents. 
InflmStions concerning the vfe Pendulum- Watches for fiw 
dwgthe Longitude atScdy together with a Method of a lour-* 
ml for fuch Watches, An extra^ of a Letter written from 
Vienna concerning two Mock-Suns lately feeia Hungary, a 
Relation of the Conferences held in the Royal Parilian Aca- 
demy for the Imfrovement of the Arts of Painting and 
Sculpture. An Account of fme Books. I INST ITUTIO- 
NUm C H RO N O Log IC a rum Llhri duo^ una 
Cum totidem ARITH M ETICES C H R ONO LOGU 
€ & Lihellis , fer Guil. Bcvereglum M. A. II. E L E- 
ME NTS OF SP EE CH y An Ejfay of Inquiry intothe 
Natural ?roduUion of Letters together with an Appendix of a 
Method to inflruSl Per{ons Deaf and Dnmb ^ by William Holder 
!>• D. &C. III. GV AG ING PROMOTED^ bdng ^ 
an Appendix toStcieom^tiiczl Profofitions formerly phhfh t by 
Rob. Andeifon. 
Inftrudions 
Concerning the vfe cf Pe«dulum- Watches ^ for 
finding the Longitude at Sea. 
W Here as 'tis generally efleemed that there is no Practife for the 
Finding of the Longitude comparable to that of thofe 
Watches y which in(lead of a Ballance-wheele are regulated by a 
Pendulum, as now they are brought to great perfect ion, ar?d 
made to me a fur e time very equally-^ and man) perhaps here as 
Qjq q q well 
