Collection Home > Telescopes > Twin-Telescopes > Twin-Telescope Binoculars
|Signature||T M J.B.L.|
|Main Tube Length||6.1in||156mm|
|Main Tube Diameter (obj)||4.4in||112mm|
|Main Tube Diameter (eye)||1.1in||28mm|
|Inter-Pupilary Distance (min)||2.2in||55mm|
|Inter-Pupilary Distance (max)||2.7in||68mm|
|Objective Clear Aperture Diameter||1.3in||32mm|
pair of binoculars has tapered brass barrels, covered with brown
leather. The objective lenses are achromatic doublets, contained in
brass cells. It has long brass eyepiece tubes, four lens eyepieces,
and flared hollow eyecups. The frame is hinged, so that the user can
adjust for the distance between the eyes. On the middle cross piece
of the frame there is a small scale, marked with gradations from 0
to 3, where this frame adjustment is indicated. Focusing is done
with a central thumb wheel. All metal parts on the binoculars are
brass, painted black.
"T M J.B.L." is stamped on the face of both eyecups. These initials are not listed in the Webster Signature Database of makers. Between the T and M is a small logo, possibly a face with emanating rays.
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