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Seite 55 - To calculate horsepower, multiply the area of the piston in square inches by the speed of the piston in feet per minute and divide the product by 33,000. The...
Seite 191 - ... great accuracy. In addition to this, the circumstance that these lines occur in groups, renders the observation of the coincidence of these spectra more exact than is the case with those composed of single lines. The lines produced by chromium also form a very characteristic group, which likewise...
Seite 176 - ... rear a sound fabric of mental science on any other foundation. To begin the study of mind, then, with the observation of its humblest bodily manifestations, is a strictly scientific method. When we come to inquire what these are, it is far from easy to fix the point at which mental function begins. Without doubt most of the actions of man, and many of those of the higher animals, do evince the operation of mind, but whereabouts in the animal kingdom it first appears, and what part it has in the...
Seite 148 - That man should be able to measure with certainty such minute portions of space and time, is not a little wonderful ; for it may be observed, whatever theory of light we adopt, these periods and these spaces have a real existence, being in fact deduced by Newton from direct measurements, and involving nothing hypothetical but the names here given them.
Seite 149 - His first suspicion of this arose when he was about four years old. Having by accident found in the street a child's stocking, he carried it to a neighbouring house to inquire for the owner : he observed the people called it a red stocking, though he did not understand why they gave it that denomination, as he himself thought it completely described by being called a stocking.
Seite 4 - I did not perceive that the cat was the least affected, and I even judged, by her air, that she would have given all the instruments in the world for a mouse, sleeping in the sun all the time ; the horse stopped short from time to time before the window...
Seite 4 - ... his head up now and then, as he was feeding on the grass; the dog continued for above an hour seated on his hind legs, looking steadfastly at the player; the ass did not discover the least indication of his being touched, eating his thistles peaceably; the hind lifted up her large wide ears, and seemed very attentive ; the cows slept a little, and after gazing...
Seite 176 - ... and stated, in conclusion, that vanadium, hitherto standing in no definite relation to other elements, must now be regarded as a member of the well-known triad class of elementary substances, comprising nitrogen, phosphorus, boron, arsenic, antimony, and bismuth.
Seite 177 - ... spherical aberration is positive or negative. (II.) That test-images may be formed of a high order of delicacy and accurate portraiture in miniature, by employing an objective of twice the focal depth, or, rather, half the focal length of the observing objective. (III.) That such test-images (which may be obtained conveniently two thousand times less than a known original) are formed (under precautions) with a remarkable freedom from aberration, which appears to be reduced in the miniature to...
Seite 191 - Fraunhofer's lines. For it is very probable that elementary bodies which occur in large quantities on the earth, and are likewise distinguished by special bright lines in their spectra, will, like iron, be visible in the solar atmosphere. This is found to be the case with calcium, magnesium, and sodium.