Lantern-slide making and exhibiting ([pref. 1905])

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18 easily be raised to the required temperatures by standing the measure containing the mixed developer in a bowl of hot water, and dipping a small laboratory thermometer into the solution until it registers from 60° to 65° Fah. Many new developers are constantly On the Choice ....... • of Developer.. bem g introduced, the merits of which are greatly extolled for slide- making, but the reader is recommended to confine his attention to the metol-hydroquinone formula (page 11) for black and cold tones, and the pyro formula (page 12), when greater warmth of colour is required. In the experience of the writer, who prefers these de- velopers to all others, these have proved themselves capable of producing the very finest results.