Microscope

simple handbook,

Conrad Beck

Post free, 2/10

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 II

An advanced handbook, by Conrad Beck

The

A b v

J

2/6 nett.

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 Microscopic Vision. Best Conditions for Resolution.

Chapter IV.—Photometry of the Microscope.

Illumination. 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.

Chapter VI.—Notes on Illumination and Technique.

High Power transmitted Illumination. Filling Aperture of Object Glass. 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 Polarisation. Application to Petrological Microscope. Special Appliances for Petrology.

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