A simple handbook, 
ow (Comme Iseel 
The Microscope 
2/6 nett. 
Post frees 2/16 
Opinions of the Press: 
“This is just the reliable, compact, and clear guide which medical students and others making 
use of the microscope for studies, research, or recreation, will find most serviceable.’’ 
“Mr. Beck has collected and put before his readers a large amount of valuable information in 
a clear and readable style.” 
“The novice at microscopy cannot but benefit by the perusal of this additional contribution 
to the literature of the subject.”’ 
“While the descriptive matter is excellent from beginning to end the author is specially good 
on the subject of illumination.”’ 
The Microscope, Part [1 
An -advanced handbook, 
by Conrad Beck 
7/6 nett. 
Post free, 8/- 
No engineer would consider himself competent to manipulate an engine without a knowledge of the 
principles upon which it was constructed and this book is an attempt to provide the information that 
will produce a skilled microscopist. 
Contents : 
Chapter I.—Geometric Optics of the Microscope. 
Image Formation. Simple and Compound Lenses. 
Magnifying Power. Gauss Equivalent Planes. Rams- 
den Circle. Eyepieces. Object Glasses. Tube Length. 
Chapter II.—The Correction of Lenses. 
Achromatic and Apochromatic. Spherical and Zonal. 
Sine Condition. | Unequal Chromatic Magnification. 
Typical Object Glasses and Eyepieces. 
Chapter III.—Aperture and Resolution. 
Diffraction. Slit. Circular Aperture. Images of a 
point. Aperture. N.A. Resolution. Theory of Micro- 
scopic Vision. Best Conditions for Resolution. 
Chapter IV.—Photometry of the Microscope. 
1]lumination. Light Gathering Power of Object 
Glasses. Relative brightness with different Apertures 
and Powers. Area of Ramsden Circle as measurement 
of Illumination. Photometry of Bulls Eye. Substage 
Condenser and various Apparatus. Comfortable 
degrees of Illumination. 
Chapter V.—Glare and Flooding. 
Effect in destroying definition. Conditions under 
which it occurs. Causes investigated. Methods of 
removing or modifying it. Different forms of glare. 
114 
Chapter VI.—Notes on Illumination and Tech- 
nique. 
High Power transmitted Illumination. 
ture of Object Glass. 
Filling Aper- 
Unequally Illuminated Aperture. 
Area of Illumination. Dark Ground Illumination, 
Opaque Illumination. Polarised Light for determining 
Structure. The Estimation of Size by diffraction 
colour effects. The Ultra Microscope. 
Chapter VII.—Notes on Testing Microscope 
Object Glasses. 
Measuring Focal Length, Aperture and Working 
Distance. Tests for Chromatic, Sperical and Zonal 
aberrations. The Podura Scale. Rulings. Unstained 
Bacteria. Diatom. Star Test. Abbe Test Plate. 
Chapter VIII.—Microscopes for Special Purposes 
Various forms of Measuring Instruments. Research, 
Tank, Museum, Projection, Horizontal, Process, 
Dissecting, Demonstration, Greenough Binocular, 
Sand and Dust, Mining Microscopes. 
Chapter IX.—Polarized Light as applied to the 
Microscope. 
Explanation of Plane, Circular, and Eliptical Polarisa- 
tion. Application to Petrological Microscope. Special 
Appliances for Petrology. 
