uration in a mortar in the water dissolve the nitrate of silver In the ammonia and add to the carbonate of soda solution. Heat gently to the boiling point; the Ink at first turbid becomes clear and very dark. 2. What lenses do better for a telescope or for a microscope ? A. Your lenses will not answer If your description is correct. A tolerable two inch achromatic object glass costs $ and a useful microscope $ Either would be preferable to a chance combination of cheap lenses. tages. 2. Suppose the wheel of a rotary engine to have % of a square inch effective pressure and its mean dis
uration in a mortar in the water dissolve the nitrate of silver In the ammonia and add to the carbonate of soda solution. Heat gently to the boiling point; the Ink at first turbid becomes clear and very dark. 2. What lenses do better for a telescope or for a microscope ? A. Your lenses will not answer If your description is correct. A tolerable two inch achromatic object glass costs $ and a useful microscope $ Either would be preferable to a chance combination of cheap lenses. tages. 2. Suppose the wheel of a rotary engine to have % of a square inch effective pressure and its mean dis The paint must be constantly renewed. 2. How can copies of the ficnorrigic Anzinceig ? A. No. 5. How makes any difierence which is the longest or whether either tube. Ten per cent of the solar light and heat will then be reflected up to h „ eyepiece and 90 per cent will pass out of the lens. A diaphragm over the objec tive may be used. Two sun glasses should be used to gether a claretand a green one. The sun's image may, scientific american, 1874-05-11
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