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Aluminium coated mylar solar filter

1998-1999

Hand held solar viewer with dark glass filter and lignum vitae wood mount and turned handle

1750-1799
Two sun filters, one dark green glass, the other smoked glass, in rectangular slide mounts for use on a telescope. Both glass filters are either cracked or blistered due to the effects of their use on the sun. Inscriptions indicated that they were used at the Royal Observatory, Greenwich and the observatory of Captain W.H. Smyth RN, at Bedford, England. It is likely that they were originally in the possession of Smyth due to his association with the United Services Institution.

Two optical Sun filters

1824-1844
Dark green glass sun filter in brass slider mount for use at the eyepiece of a telescope, unsigned, English, 1824-1831. Inscription indicates that the glass was blistered whilst observing the sun with a five feet telescope at the Royal Observatory Greenwich, England. It is likely that it was originally in the possession of Smyth due to his association with the United Services Institution.

Green glass Sun filter in brass slider

1824-1844