Pocket Magnifier

Title

Pocket Magnifier

Description

The pocket focusing magnifier is made from lacquered brass and has an unusual Archimedean screw thread. To focus the instrument, the body-tube is twisted up along the thread in a screwing motion to adjust the distance between the ocular lens and the 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 for photography and were designed to image what they are aimed at, or place against and therefore do not let light to enter.

Condition:

Cosmetically: The brass is marked by age and use but is in good condition.
Optically: The lenses are clear and functional.
Mechanically: The magnifier is functional.

Subject

Focusing Magnifier

Creator

Unsigned

Source

Dean Reynold's Microscope Collection Powerpoint 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 http://www.microscope-antiques.com/focusingphoto.html

Publisher

UNC Charlotte

Date

c. 1900

Contributor

Laura Burgess

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 1/4" closed, 3 1/4" extended

Language

N/A

Type

Three-dimensional object

Identifier

101124

Coverage

Unknown

Item sets

Microscopes

Item