Manual of Practical Physiology: Designed for the Physiological Laboratory Course in the Curriculum of the American Association of Medical Colleges

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P. Blakiston's Son & Company, 1912 - 223 páginas
 

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Página v - I often say that when you can measure what you are speaking about and express it in numbers you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind...
Página 129 - Guided by these facts I have been gradually led to look upon fermentation as a necessary consequence of the manifestation of life when that life goes on without the direct combustion due to free oxygen. We may see as a consequence of this theory that every organism, every cell which lives or continues its life without making use of atmospheric air, or which uses it in quantities insufficient for the whole of the phenomena of its own nutrition, must possess the characteristics of a ferment with regard...
Página 28 - The lever holder at the end of the plate is constructed of thin sheet steel and slips from side to side in order to bring it opposite either leg of the frog. The distance from the axis of the...
Página 19 - A) open at the front and ends, contains a strong magnet, the armature of which is mounted upon a steel spring. An accurate, fine adjustment screw regulates the excursion of the armature. One binding post is mounted upon the metal box, the other is insulated by a rubber block. This signal, in circuit with a vibrating tuning fork, will record 100 double vibrations per second. In the primary circuit of the inductorium it will record the make and break of the current without after-vibration.
Página 14 - The inductorium. thus excluding the interrupter. These several connections upon the head-piece are simply arranged and are all in view ; there are no concealed wires. From the head-piece extend two parallel rods 22 cm. in length, between which slides the secondary coil, containing 5000 turns of silk-covered wire 0.2 mm. in diameter. Over each layer of wire upon the secondary spool is placed a sheet of insulating paper. Each end of the secondary wire is fastened to a brass bar screwed to the ends...
Página 6 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere...
Página 29 - N is passed through the tendon and the length of the thread adjusted at C. The skin on the thigh is opened to the extent of 2 cm. and the biceps femoris muscle removed, the sciatic nerve carefully separated from the FIG.
Página 28 - The distance from the axis of the elbow-lever to the thread-eye is the same as that to the weight, therefore, the weight lifted by the muscle is the actual weight hung upon the weight link. When the lever passes a little below the horizontal position, it comes into contact with the rest. The rest can be used in "after-loading
Página 31 - T\I may be secured. The under surface of the contact block is bevelled so that the metal touches the wire only with one edge; the opposite edge is supported by a piece of hard rubber. A flexible cable leads from the contact block to the binding posts shown in the foreground to the right.
Página 24 - These operations are easily and rapidly performed, though, as in all gear mechanism, an instant's pause is sometimes required to enable the gear teeth to engage. The clockwork should be in motion, without the fan, when the adjustments are being made. With both fast and slow gearing four fans of different areas may be used. They are slipped upon an extension of the last pinion shaft in the chain. Five slow and five fast speeds (exclusive of spinning) are thus obtained. An additional slow speed (50...

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