The Dictionary Of Photography

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

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Millilitre
Mirror Silvering
process is employed. They are made chiefly by M. Dagron, of Paris, whose application of micro-photography to a means of communicating from inside besieged Paris to the outer world is mentioned under Pigeon Post. (For Photo-micrography, see the article under that heading.)
Millilitre. A statutory measure of capacity equal to one-thousandth of a litre. By an order of Council, May 19th, 1898, issued under the " Weights and Measures Act (Metric System) 1897," the millilitre (one-thousandth of a litre) is substituted for the cubic centimetre, as a measure of capacity. (See Cubic Centimetre, Metric System ; also Weighing and Measuring.)
Minim. See Weighing and Measuring.
Mirror, Reversing. A silvered mirror with the metal film outwards, placed in front of the lens when laterally reversed negatives are wanted. (See next article; also Reversed Negatives.)
Mirror Silvering. As the worker may desire to resilver a mirror or a copper reflector, the following recipes may be found useful: -
For glass -
No. I. Nitrate of silver ... ... ... ... 175 grs.
Distilled water ... ... ... «... 10 ozs.
No. 2.
Nitrate of ammonia... ......... 262 grs.
Distilled water ............ 10 ozs.
No. 3. Pure caustic potash... ... ... ... 437-5 grs.
Distilled water ... ... ... ... 10 ozs.
No. 4.
Pure sugar-candy............ 210 grs.
Distilled water ... ... ... ...          5 ozs.
Dissolve and add
Tartartic acid           ... ......... 50 grs.
Boil in a flask for ten minutes, and when cool add
Alcohol         ... ... ... ... ...          1 oz.
Distilled water to............ 10 ozs,
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