The hand-book of household scienceA popular account of heat, light, air, aliment, and cleansing, in their scientific principles and domestic . will throw downward a beautifulsoft white light. If the light from a luminary whichis surmounted by a white or polished reflector () be made to pass through a glass globe filled withwater which has been slightly blued, its color will beimproved, while to compensate for the loss of luminous matter ab-Fig. 6T. sorbed, the spherical form of the water-bottle will serve toconverge or gather the rays soas greatly to increase their illu-min
The hand-book of household scienceA popular account of heat, light, air, aliment, and cleansing, in their scientific principles and domestic . will throw downward a beautifulsoft white light. If the light from a luminary whichis surmounted by a white or polished reflector () be made to pass through a glass globe filled withwater which has been slightly blued, its color will beimproved, while to compensate for the loss of luminous matter ab-Fig. 6T. sorbed, the spherical form of the water-bottle will serve toconverge or gather the rays soas greatly to increase their illu-minating power, at the pointupon which they fall. Mello-Ni has proved that when therays of artificial light are passedthrough even a very thin stra-tnm of water, their heatingpower is diminished by eighty-nine per cent., but with littleincrease in the temperature ofthe water, in consequence of itsgreat capacity for heat (49).The water-globe thus transmitsa cooler as well as a whiter andpurer light. Lamp-globes madeof glass, slightly blued in its comjiosition, would be very Colored glasses for Speftaeies.—The indiscriminate use of these. Whitening the rays and straining them oftheir heat. COLOBBD GLASSES—MISUSE OF GAS. 149 is altogether objectionable. They place the eyes in very unnaturalconditions as regards the light, and if their employment is persisted in,it impairs their sensibility to the true relations of color, and otherwiseinjures them, as we have just seen that artificial colored light is ableto do (253). If we look through a glass of any color, the effect is, thatwhen it is withdrawn, the eye sees all objects tinged by its comple-mentary. As the colored glass cuts off a large quantity of light, itsremoval produces a sudden and injurious impression. Faint blueglasses may be serviceable in using artificial hght. Colored glassesabsorb and accumulate the heat so as in many cases to be disagreea-ble. Their bad effects are more marked, as it is for weak eyes
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectfood, booksubjecthome
