English Mechanic and World of Science: With which are Incorporated "the Mechanic", "Scientific Opinion," and the "British and Foreign Mechanic.", Band 43E. J. Kibblewhite, 1888 |
Inhalt
| 1 | |
| 12 | |
| 22 | |
| 34 | |
| 65 | |
| 67 | |
| 75 | |
| 97 | |
| 192 | |
| 196 | |
| 206 | |
| 215 | |
| 227 | |
| 249 | |
| 252 | |
| 454 | |
| 104 | |
| 125 | |
| 140 | |
| 141 | |
| 163 | |
| 169 | |
| 187 | |
| 460 | |
| 506 | |
| 560 | |
| 571 | |
| 572 | |
| 582 | |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
acid amateur ampères angle answer apparatus appears armature astronomical battery boiler bottom brass Bristol carbon cell centre coil colour comet copper core correspondent cylinder described diameter diatoms disc drill dynamo ebonite edge electric engine ENGLISH MECHANIC equal experience eyepiece give glass Greenwich Mean harmonium heat hole inch instrument iron kindly lamp lathe Leclanché cells length lens letter lever Leyden jar light machine magnets mandrel Mason and Hamlin means metal method microscope object observations obtained ohms ordinary paper piece pipe plane plate pressure Prof pulley quantity querist query readers reed reply resistance ring round screw shellac side silver sketch slide solder solution specific gravity spindle star steam steel surface telescope thick tion tool tube turn valve volts weight wheel wire wood zinc
Beliebte Passagen
Seite 395 - Leclanche galvanic battery. The instrument is read by depressing a key which causes the needle of the galvanometer to deflect ; a pointer or vernier (moving a contact roller upon a wire in a circular groove) is then pushed to the right or to the left upon a divided scale until the needle remains stationary on the zero point, when the electrical resistance of the wire is measured upon the scale. The number indicated by the vernier is then read off, and by referring to a table of equivalents the actual...
Seite 392 - The predominance of nervous symptoms is a characteristic of theism. General excitation of the functions of the nervous system may be observed, or the weakness may be noted more especially in the brain as distinguished from the spinal cord. Perversion of the sense of hearing is not at all an uncommon symptom, patients hearing voices that have no real or objective existence. The irritability that overtakes women so frequently may sometimes be clearly traced to an excessive indulgence in afternoon tea.
Seite 304 - ... particles of the iron towards one another is increased, and thus the rod becomes compressed. But this cannot be the case if the magnetic condition of the iron has become constant and independent of the magnetising current. And a similar objection will apply to any hypothesis which assumes (as, perhaps, all must) that some property of the iron dependent upon its magnetic condition varies in a sensible degree with the magnetising force after the " saturation point
Seite 392 - The habit of tea-drinking is one that grows on its victims like the similar ones of opium or alcohol. Taken in strict moderation, and with due precautions in the mode of preparation, tea is, like alcohol, a valuable stimulant ; in its abuse there is also certain analogy.
Seite 388 - J in. to 10 feet by 5 feet by i in. Worked out on the Basis of 40 Ibs. to the square foot of Iron of i inch in thickness. By H. BURLINSON and WH SIMPSON.
Seite 392 - Bloy's paper is well calculated to arouse attention, and, we hope, to lead to some abatement of this widespread disorder. America and England are the two countries that are afflicted most with the maladies arising from the excessive consumption of tea. Individuals may suffer in a variety of ways. It is customary to speak of acute, eubacnte, and chronic " theism " — a form that has no connexion with theological matters. It is possible to be a "theic" by profession or a "theic
Seite 304 - Campbell's sunshine instrument during 1883 was 1241, which is about 30 hours above the average of the six preceding years. The aggregate number of hours during which the sun was above the horizon was 4454, so that the mean proportion of sunshine for the year was 0'280, constant sunshine being represented bv 1.
Seite 304 - Campbell's sunshine instrument during 1886 was 1228, which is about twenty hours above the average of the preceding nine years. The aggregate number of hours during which the sun was above the horizon was 4454, so that the mean proportion of sunshine for the year was 0^276, constant sunshine being represented by I.
Seite 304 - The diameter of a ring was found to be increased by a comparatively small magnetising current, and diminished by a strong one. Now the retraction in question does not begin to occur until after the stage of magnetisation, loosely called the " saturation point," has been passed, when, according to the common belief, the magnetisation of the iron has practically reached a limit, and is not sensibly affected by any further increase of the magnetic force ; and hence arises a difficulty in accounting...
Seite 304 - Ibs. per square inch," t and much later Rowland stated,J as a probable result of his well-known researches in magnetic permeability, that the greatest weight which could be sustained by an electromagnet with an infinite current was, for good but not pure iron, 177 Ibs. per square inch, or 12,420 grams per square centimetre of section. It has long been known that when an iron rod is magnetised its length is in general slightly increased. Some experiments on this effect of magnetisation, an account...