Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable -- Binary/unsupported file stripped by Ecartis -- -- Type: image/jpeg -- File: Whitworth telescope and microscope threads.jpg MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.