Minutes of Proceedings of the Institution of Civil Engineers, Volume 52The Institution, 1878 Vols. 39-204 (1874/75-1916/17) have a section 3 containing "Abstracts of papers in foreign transactions and periodicals" (title varies); issued separately, 1919-37, as the institution's Engineering abstracts from the current periodical literature of engineering and applied science, published outside the United Kingdom. |
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acid alternating currents amount apparatus armature Author average blast-pipe boiler bridge burning burnt caisson candles carbon carbonic acid cent chimney circuit coal coils coke combustion considerable construction copper cost cubic feet cubic foot cubic yards curves cylinder diameter distance driving dynamo machine dynamo-electric machine effect electric light electro-magnet employed engine excavated experiments fire-box surface fire-grate foot of grate formula furnace gallons gases given Gramme machine heating surface hour increased Inst intensity iron lamp length liquid fuel locomotive locomotive boiler magnetic mètre miles motion navvy obtained ordinary Paper planing machine plate practical pressure produced proportion quantity of water rails railway rain ratio resistance revolutions per minute Siemens machine South Foreland square feet square foot standard candle steam Sylt temperature tons transmission trials tube surface wagons water evaporated water per lb weight wheels wire
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Página 21 - Experiments and observations to determine whether the quantity of rain and dew is equal to the quantity of water carried off by the rivers, and raised by evaporation; with an inquiry into the origin of springs.
Página 19 - This, perhaps the greatest marvel hitherto achieved by the electric telegraph, has been obtained by appliances of quite a homespun and rudimentary character. With somewhat more advanced plans, and more powerful apparatus, we may confidently expect that Mr. Bell will give us the means of making voice and spoken words audible through the electric wire to an ear hundreds of miles distant.
Página 18 - ... of iron to an iron tube surrounding the coil and bar. The free circular end of the tube constitutes one pole of the electro-magnet, and the adjacent free end of the bar core the other. A thin circular iron disc held pressed against the end of the tube by the electric-magnetic attraction and free to vibrate through a very small space without touching the central pole, constitutes the sounder by which the electric effect is reconverted into sound.
Página 18 - Bell exhibits an apparatus by which he has achieved a result of transcendent scientific interest — a transmission of spoken words by electric currents through a telegraph wire. To obtain this result Mr. Bell perceived that he must produce a variation of strength of current as nearly as may be in exact proportion to the velocity of a particle of air moved by the sound, and he invented a method of doing so — a piece of iron attached to a membrane (fig.
Página 18 - Bell perceived that he must produce a variation of strength of current in the telegraph wire as nearly as may be in exact proportion to the velocity of a particle of air moved by the sound ; and he invented a method of doing so, a piece of iron attached to a membrane, and thus moved to and fro in the neighborhood of an electro-magnet, which has proved perfectly successful.
Página 82 - Thomson's enthusiasm: [Thomson] believed that with an exceedingly moderate amount of copper it would be possible to carry the electric energy for one hundred, or two hundred, or one thousand electric lights to a distance of several hundred miles. The economical and engineering moral of the theory appeared to be that towns henceforth would be lighted by coal burned at the pit's mouth, where it was cheapest.
Página 10 - ... the world. You will long since have anticipated my conclusion, — that there is no reason for abandoning our system of apprenticeship or pupilage, to substitute for it the foreign plan of large special colleges, even if we could hope to create colleges of equal merit with those formed abroad. But this conclusion, instead of leading us to sit down wrapped comfortably in a veil of blinding self-conceit, ought rather to urge us to work with the greater vigour at removing the acknowledged defects...
Página 18 - ... perfectly successful. The battery and wire of this electro-magnet are in circuit with the telegraph wire and the wire of another electromagnet at the receiving station. This second electromagnet has a solid bar of iron for core, which is connected at one end, by a thick disc of iron, to an iron tube surrounding the coil and bar.
Página 296 - Granite (roughly worked) on sand cylinder, standing in an extensive and rather uniform bed of gravel, and having ceased to move for thirty-two hours, gave a frictional resistance of nearly 200 Ibs. per sq. ft.* At a bridge over the Danube near Stadlau, a cylinder sunk 18.75 feet into the soil (the lower 3.75 feet being "solid clay") gave a frictional resistance of 100 Ibs. per sq. ft.* According to some European experiments, the friction of cast-iron...
Página 24 - ... of latitude whence it was originally set in motion, it rapidly traverses the short space of level country, and with little diminution of its weight or volume, but on reaching the mountains, it meets with a temperature many degrees lower than the point at which it can continue in a state of vapour; sudden condensation consequently ensues, in the form of vast torrents of rain, which, in some instances, must descend almost in a continuous sheet, as when 9 or 10 inches are precipitated in forty-eight...