BACKGROUND: By using a telescope as a receiving instrument, heliographs could be spaced out of long distances. The MkIII was used from 1903-1915. The MkIII did have some problems. To extend the telescope you must unlatch the straps between the end caps, which you can withdraw if you have given yourself slack on the sling strap. It is very heavy for hand holding You also had to ensure good cover to use the stand and it had a very small field view.

PHYSICAL DESCRIPTION: A black painted, brass telescope that measures approximately 53cm long. The body is marked with "No. 379" with a 1916 date, "Sighting Telescope No. 5 (Mk. II). The telescope is non-collapsible. A wood and brass telescope tripod that has been over painted in black paint. The brass clamp that would hold the telescope is clearly marked to one side Mark V. "Sig. Tel. Stand" and is broad arrow marked. The wooden legs measure approximately 31cm long.