I 
t 422 3 
Some Account of a new-conftrucied Microfcope* 
ufed in the foregoing Experiments. 
T H E cumberfome and inconvenient 
Double Microscopes of Dr. Hook 
and Mr. Marjhal, were many Years ago re¬ 
duced to a manageable Size, improved in their 
Structure, fupplied with an eafy Way of en¬ 
lightening Objects by a Speculum under¬ 
neath *, and in many other Refpedis render- 
ed agreeable to the Curious , by Mr. Culpepr 
per and Mr. Scarlet. Some farther Altera¬ 
tions were however wanted to make this In- 
ftrument of more general Ufe, as I fully ex¬ 
perienced in the Year 1743, when examin¬ 
ing daily the Configurations of Saline Sub- 
fiances, the Legs were continual Impedi¬ 
ments to my turning about the Slips of Glafs; 
and indeed I had found them frequently fo. 
on other Oecafions. Pulling the Body of 
the In ftrument up and down was likewife 
iubjedt to jerks, which caufed a Difficulty in 
fixing it exactly at the Focus : there was al- 
fo no good Contrivance for viewing opake 
Objects. Complaining of thefe Inconvenien- 
cies, Mr Cuff\ the Optician, applied his 
Thoughts to fafhion a Microfcope in another 
Manner, leaving the Stage entirely free and 
open by taking away the Legs, applyinga 
* See Microfcope made eafy, Plate III. page 16. 
fine- 
