COMPOUND MONOCULAR MICROSCOPE

MAKER:ANDREW PRITCHARD

MODEL:'ACHROMATIC ENGISCOPE' (Massive Version)

c. 1854

SIGNED: 'Andrew Pritchard, 162 Fleet street. London'

SERIAL NUMBER: 560

Optical Data Obtained with Stage Micrometer and Cheshire Apertometer:

		Magnification With Eyepieces
Objective	N.A.	5X	8X	12X
2 in.	-	20	32	45
1 in.	0.09	36	60	90
1/2 in.	0.18	67	120	180
1/3 in.	0.20	80	140	200
1/7 in.	0.51	220	375	520
1/10 in.	0.54	285	500	700