Maker: Pyefinch, Henry

Year: 1777 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: No 164 / Pyefinch / London

Signature Notes:

Inscriptions:

No stand present.

Collection: Coll. Willach

Accession #: RW 156 [58] [2022 22 2006 24] [2023]

Sources:

Project investigation

Public Notes:

The patent in 1770 was for the achromat setup shown here. The Dollond patent runs out in 1772. This telescope can adjust separation of flint and crown. This patent is for changing focal length (officially) by slider. Actually it is for chromatic aberration. This is the only one surviving.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: doublet (flint forward)

Optical style

Physical style

Functional style

Materials: wood, brass, glass

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: