The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Metol
Micro-Photography
Metol. A salt of methyl-amido-cresol which has come largely into use as a developing agent for negatives, and more especially for positives on paper. Dr. Eder's standard solutions for metol development are as follows : -
A.
Water           ...... ... ... ... 100 parts.
Neutral sodium sulphite ... ... ... 10 ,,
Metol..................          I ..
B.
Water ... ... ...... ...        10 parts.
Potassium carbonate ... ... ...          I ,,
For sepia tones on gelatino-chloride paper Dr. Just recommends -
Solution A. ... ... ... ... ...          2 ozs.
10 per cent, bromide potassium solution...        20 drops. For red tones -
Solution A. ... ... ... ... ...          1 oz.
Water ...... ... ......          3 ozs.
10 per cent, bromide potassium solution...          8 drops. (See also Development and Developers).
Metric System. A system of weights and measures in which the principle of decimal division is carried out. It was established by the revolutionary administration in France towards the end of the eighteenth century, and is legalised in Great Britain under several Acts of Parliament. Originally the metric system was intended to be based on the ten-millionth part of a meridian circle, this being called a metre, but the original measurements' having proved faulty, the standard has become an arbitrary one. Under Weighing and Measuring will be found tables of metric equivalents. (See also Cubic Centimetre, Millilitre, and Litre.
Micro-Photography - the antithesis of macro-photography - consists of the reproduction of positives in a very minute size which require the use of a simple microscope or magnifying glass to examine. Micro-photographs are well known to the majority of amateurs, from the minute photographs which are usually sold at seaside places, the photographs being fixed behind a minute magnifying glass in the handle of some little but fancy article. Their production is comparatively easy, but the collodion
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