DO NA at OO ANG. 
1784. _- Donors. PRESENTS. 
Feb. 20. SamuelVaugh= A 3% feet acromatic telefcope, 
an, Efquire, ; completely mounted on a ma= 
hogany ftand, with rack work 
to move it along the meridian, 
or parallel tothe equator, made 
by Mr. Dolland. 
A Gunter’s fcale improved, for 
navigation and aftronomy, by 
Mr. John Robertfon, with a 
defcription thereof by Mr. 
Mountaine. 
A magazine microfcope, confift- 
ing of a fingle, double, and 
folar microfcope. 
Mr. William Parker by A burning lens 11+ inches, with 
Mr. S. Vaughan, a fecond lens of 62 inches di- 
ameter, completely framed and 
mounted on amahogany turn- 
ed cone, with rack work, pil- 
lar, pinnion and apparatus for 
placing the whole in a proper 
~ fituation.. 
March 19. Dr. Franklin, A treatife in French, on the fub- 
ject of air balloons. 
Samuel Vaughan, Efg- A copy in manufcript of Dr. 
Prieftley’s experiments on 
phlogifton, and the feeming 
converfion of water into air. 
Apr. 2. Mr. F.Vaughan, Dr. Prieftley’s works, complete 
in. 33 volumes. 
Dr. Prieftley’s biographical and 
hiftorical charts. 
April 
