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Description: | SPINDLER & HOYER Werkstatte fur Prazisionsmechanik, Gottingen. (Embossed on makers trade plate. MANU Spindler & Hoyer early 20th century Gottingen, Germany. This is a photometer that has presumably been used as a dark adaptometer (biophotometer) it was designed to be used with a dual light source see GLAHM 113962. From two seperate sources the light is is combined by the photometer to form two semicircles of light one above the other in the eye piece. If the observer has no ocular disunction then a straight foreward comparison of the two fields is possible as in a photometer. If however, the is any eccentricity or macular degeneration of the retina in th obserbvers eye then the instrument can be used to measure the amount of damage. This can be done by both altering the intensity of one of the light sources and by altering the angle of incidence of the light reflectetd into the eye piece of the instrument from one of the opalescent glass screens. The angle that is required by the observer to equalise the two light fields is a measure of the disfunction. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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