Word: screening
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...illuminated pin holes in a metal card; or, in some instruments, any other image is used such as the reflection of micrometer lines in a star. Any change in the surface of the mercury causes a blurring of this image, which is reflected from the mercury upon a screen. The reflection is observed by means of a telescope or microscope placed so as not to be easily jarred. The utmost delicacy is obtained by this arrangement, for if a sufficiently high magnifying power is used, a movement along the screen of the reflected spot or image a thousandth part...
...attract his attention in the exterior of the house, unless it be the care with which that sanitary law has been observed, which demands that the cold air box to the furnace shall have its mouth at least three feet above the ground, and covered with a wire screen. There are few visitors; perhaps because the students hesitate to take their friends to the rooms, lest they intrude upon the privacy of the family whose home it is. If you enter, you find, on the left, a parlor which is used occasionally as a recitation room, and the rest...
After throwing upon the screen some beautiful interior views of the Ducal Palac, the lecturer went on to the description of the Grand Canal, lined with noble palaces on either side, which have now been desecrated by being converted into mere ware-houses. A few more views of a general nature closed the exhibition. It is to be regretted that some of the views were so in distinctinctly taken, as the injudicious "restorations" which are now going on will destroy many of the beauties which should be preserved by this means...
...that it has been definitely settled that the remaining lectures of the Historical Society course are to be delivered in Sanders Theatre, we should like to suggest the use of the stereopticon for producing maps of the desired size. If it is possible to obtain or construct a proper screen the rest of the undertaking ought to be easy. The desired maps can be easily photographed. The negatives thus formed make the lantern slides. A lantern, or more than one, is in the possession of the college, and there are men here who know...
Those who sit near the entrance at the lower end of Memorial Hall, are made exceedingly uncomfortable by the cold draught whenever the door is opened. Could not one large screen be placed close to the door and directly in front of it, on each side of which one could enter. The present small screens are of no use whatever...