448 ‘Miscellaneous Intelligence. 
2. New form of Compressor for use with the Microscope, (in a letter to 
Prof. G. C. Scnarrer).—My Dear Sir—At your request I enclose a 
sketch of the little instrument that I use as a substitute for the ordinary 
compressor, in mounting objects for the microscope. 
The frame a, 
is madefromone 
OUR - SS justed by the 
firmly riveted 
in the frame at a, and plays freely in a slot at 6, The swinging tripod, 
(also cut'from one piece,) is loosely riveted to the bent end of the frame 
as shown in section at f, having sufficient play in the collar to adjust 
itself to any inequality in the slide or the cover. : . 
The centre of the frame, at c, under the tripod, is pierced with a hole 
ce. ; 
For mounting objects dry, or for covering cells I find it useful as it 
enables me to hold the cover securely while I have access to its entire 
i i the cement. pe 
tory way of perfecting the mounting of difficult test objects. 
Other scodihagsben of this little eaeaiall will readily ap fe 
selves to you. It is, to me, a great convenience to have a dozen 0 
at hand, of various sizes, as I can thus get my slides thoroughly se made 
under a perfectly uniform pressure—and I can have twenty of RGR 
ba 
4 
for the cost of one English compressor alphia, — 
P . ‘I ] Iph 
My friend, Mr, McAllister, Optician, 728 Chestnut St., Ph at seven 
made them for me from a drawing, very neatly and accurately, : 
dollars and fifty cents per dozen ($74). 
Very truly, your friend, 
Washington, Jan. 4th, 1860. 
3, Morrow CLak® ; 
age EO eee 
ph Ee eel eee 
