The University of Arizona
College of Optical Sciences

Collection Home > Telescopes > Twin Telescopes > Aluminum Twin Telescopes

 

Aluminum Twin Telescopes

Signature Negretti&Zambra, London

Date Late 1800s
Dimensions English Metric
Closed Length 9.2in 234mm
Extended Length 13.6in 345mm
Main Tube Length 3.7in 93mm
Objective Clear Aperture Diameter 1.18in 30mm

Description

This pair of binoculars has parallel aluminum barrels, covered with brown leather. The objective lenses are achromatic doublets, contained in aluminum cells. It has aluminum eyepiece tubes, four lens eyepieces, and flared eyecups. The thumbwheel with its axel perpendicular to the barrels adjusts the barrels' spacing, to adjust for different eye separation. The other thumbwheel, whose axel runs parallel to the barrels, is used for focusing. The objective lenses have extendable sunshades, which are covered in leather. The face of the left eyecup is marked "ADJUSTED IN LONDON" and the right eyecup is marked "NEGRETTI & ZAMBRA OPTICIANS TO THE QUEEN." The binoculars have a fitted leather case. The inside of the leather lid is marked "NEGRETTI & ZAMBRA OPTICIANS To Her Majesty 45 CORNHILL 122 REGENT ST. LONDON."

 


College of Optical Sciences
The University of Arizona, 1630 East University Boulevard, Tucson, Arizona U.S.A. 85721-0094

All contents copyright 2008  Arizona Board of Regents.