An Abbe refractometer is a bench top device for the high precision measurement of an index of refraction.

It is the intersection of these rays (triangulation) that determines the three dimensional location of the point.

Optical Drive

Plain

Made on mechanical bobbin machines

Other yarn, single, untwisted or with a twist not exceeding 50 turns per m

Of polyurethane

Machines for resistance welding of metals, neither fully nor partly automatic (excl. machines for butt welding)

Optical Drive

My laptop doesn't have an optical disk drive.

I find this a fascinating object. It's a fiber optic cable for a stereo.

Keck Interferometer The Interferometer allowed the light from both Keck telescopes to be combined into an baseline, near infrared, optical interferometer.

Flax, broken, scutched, hackled or otherwise processed, but not spun

Woven fabrics of jute or of other textile bast fibres of heading 53.03

Jute and other textile bast fibres (excluding flax, true hemp and ramie), raw or processed but not spun tow and waste of these fibres (including yarn waste and garnetted stock)

Of artificial filaments

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Apparatus

Information to be borne by and to accompany the instrument

This is the first ever such experiment, sort of the optical equivalent of Galvani's.

system Euromarc complemented by the optical storage system which permits live

Sewing thread of man made filaments, whether or not put up for retail sale

Synthetic filament yarn (excluding sewing thread), not put up for retail sale, including synthetic monofilament of less than 67 dtex

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Computer telephony device

USB Device