Pocket Magnifier

Item

Title

Pocket Magnifier

Description

The pocket focusing magnifier is made of lacquered brass and has an unusual Archimedean screw thread. Focusing is operated by twisting the body-tube along the thread in a circular motion to adjust the distance between the ocular and objective lens. These instruments were commonly composed of two plano-convex lenses of identical focal length, mounted with their plane sides outward at a distance apart equal to two-thirds of the focal length. This instrument would have been used in photography. It could be used to focus on an image by aiming the lens or placing it against an image, therefore not allowing light to enter.
Condition:

Cosmetically: There are small chips to the edge of the underside of the eyepiece glass, and to the thread.
Optically: The optics are good and functional.
Mechanically: The microscope is functional.

Subject

Focusing Magnifier

Creator

Unsigned

Source

Dean Reynolds Microscope Collection Powerpoint

Publisher

UNC Charlotte

Date

c. 1850-1900

Contributor

https://books.google.com/books?id=YElIAAAAYAAJ&pg=PA264&dq=camera+focus+magnifier&hl=en&sa=X&ved=0ahUKEwiN-buIjZnaAhVP4VMKHcFbAOYQ6AEIVjAI#v=onepage&q=camera%20focus%20magnifier&f=false

Rights

Texts and images from this collection may not be used for any commercial purpose without prior permission from the Graduate Office, UNC Charlotte.

Relation

N/A

Format

Magnifier: 2 1/2" closed, 3 1/2" extended.

Language

N/A

Type

Three-dimensional object.

Identifier

100407a

Coverage

Unknown

Item sets

Microscopes

Tags

Magnifier
Brass
Pocket
glass
19th century
20th Century
Compound
Monocular