The First Year of ScienceSanborn, 1914 - 484 σελίδες |
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Σελίδα 72
... rays from any place brings its night . b . Fuels . Man is the only animal that uses fire . Other animals and the world of plants store up some of the energy received from the sun , and man uses them for food and fuel . In causing a fuel ...
... rays from any place brings its night . b . Fuels . Man is the only animal that uses fire . Other animals and the world of plants store up some of the energy received from the sun , and man uses them for food and fuel . In causing a fuel ...
Σελίδα 151
... ray , and a number of parallel rays make up a beam . A sunbeam is an example . If a sunbeam enters a dark , dusty room , its straight path is shown by the illuminated dust particles . On a foggy night a street lamp sends out straight ...
... ray , and a number of parallel rays make up a beam . A sunbeam is an example . If a sunbeam enters a dark , dusty room , its straight path is shown by the illuminated dust particles . On a foggy night a street lamp sends out straight ...
Σελίδα 152
... rays of light from a large number of points on its surface . Each of these points sends a small beam through the pin - hole , and the beam , when it strikes the white screen , makes an image of the part of the candle flame from which it ...
... rays of light from a large number of points on its surface . Each of these points sends a small beam through the pin - hole , and the beam , when it strikes the white screen , makes an image of the part of the candle flame from which it ...
Σελίδα 157
... Rays of light from O strike the surface of the mirror everywhere ; but only the ray that meets the mirror at F passes to the eye , according to the rule of reflection ( § 174 ) . But the eye sees O only in the direction from which the ...
... Rays of light from O strike the surface of the mirror everywhere ; but only the ray that meets the mirror at F passes to the eye , according to the rule of reflection ( § 174 ) . But the eye sees O only in the direction from which the ...
Σελίδα 159
... rays of light pass through a lens , they are bent toward the thickest part of the lens . This is shown in FIG . 152 . Forms of lenses . Fig . 153. Parallel rays coming from the left would thus be brought together , or " brought to a ...
... rays of light pass through a lens , they are bent toward the thickest part of the lens . This is shown in FIG . 152 . Forms of lenses . Fig . 153. Parallel rays coming from the left would thus be brought together , or " brought to a ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acid alcohol ammonia animals bacteria becomes blood body boiling bones bottle burning calcium called capillary carbon dioxide carpels carried cells center of mass cerebrum changed chloride chlorophyll clothing coal cold color compounds consists contains cooled copper cord corpuscles cotyledons cubic dermis digestion diphtheria disease disinfectants dissolved earth electric epidermis esophagus fibers flame force freezing gases germs give glands glass gram heat hence hydrochloric acid hydrogen inches intestine iron juice kerosene layer light lime limestone liquid lungs magnet material melted mercury mercury oxide metal milk molecules motion mouth muscles nerve nitrogen object organs oxide oxygen pharynx phosphorus plants potassium pressure produce proteids rays removed rock salt seed skin small intestine soap sodium soil solid soluble solution steam stem stomach stove substances sugar sulphur sulphur dioxide surface temperature tissue tube vapor vessel weather weight wind wire wood
Δημοφιλή αποσπάσματα
Σελίδα 459 - Measures of Length 10 millimeters (mm) =1 centimeter cm 10 centimeters =1 decimeter dm 10 decimeters =1 meter m 10 meters =1 dekameter Dm 10 dekameters =1 hektometer Hm 10 hektometers =1 kilometer Km...
Σελίδα 459 - Measures of Weight 10 milligrams (mg) =1 centigram eg 10 centigrams =1 decigram dg 10 decigrams =1 gram g 10 grams =1 dekagram Dg 10 dekagrams =1 hektogram Hg 10 hektograms =1 kilogram Kg...
Σελίδα 459 - ... decimeter =1 liter (1.) 10 liters =1 dekaliter (dl.). 10 dekaliters =1 hectoliter (hi.). 10 hectoliters =1 kiloliter (kl.). 4. Weight. The gram is the weight of 1 cc water at 4° C.
Σελίδα 40 - ... hung up at one end, which when long enough will at last break with its own weight. Torricelli, however, in 1643, made an experiment which gave the true explanation of the pump-maker's difficulty. Filling with mercury a glass tube three feet in length, and closed at one end but open at the other ; he closed the open end with his finger, and inverted the tube in a basin filled with mercury. The mercury then sank in the tube to a given level, whilst above this level there was an empty space, which...
Σελίδα 471 - The major planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
Σελίδα 396 - The nervous system is divided into two major categories: the central nervous system, consisting of the brain and spinal cord, and the peripheral nervous system, which is composed of all nerves that extend outward from the brain or spinal cord (Fig.
Σελίδα 467 - The Handbook of Chemistry and Physics, published by the Chemical Rubber Company, Cleveland, Ohio, contains tables of various properties of the elements.
Σελίδα 9 - LINEAR MEASURE 10 millimeters (mm.) = 1 centimeter 10 centimeters (cm.) — 1 decimeter 10 decimeters...
Σελίδα 60 - Fig. 25. noticeably for an increase in temperature and the amount of its expansion can be very readily determined. The ordinary thermometer consists of a glass tube of uniform bore which has a bulb at one end. The bulb and part of the tube are filled with mercury. The remaining part of the tube is empty, so that the mercury can freely rise or fall. When the temperature rises, the mercury expands and rises, when the temperature falls, the mercury contracts and sinks.
Σελίδα 11 - Tho symbol (Ib.) for it is equally general, and is derived from the Latin word libra. The old English pound, which is said to have been the standard of weight from the time of William the conqueror till that of Henry VII., was derived from the weight of 7,680 grains of wheat, all taken from the middle of the ear, and well dried.