Discoveries and
章节目录
共 93 段- THE GREAT WHEEL IN ACTION _
- If the pressure per square inch is known, it is plain that b
- The Stephenson’s link motion, described on page 17, has late
- “Iron and coal,” it has been well said, “are kings of the ea
- We begin with _carbon_, which forms the chief constituent of
- The first step in the conversion of the pig iron usually tak
- When iron is combined with a much smaller proportion of carb
- “I have before mentioned that after the boil has taken place
- Siemens was much engaged from 1846 in conjunction with his b
- Still more lofty edifices have been going skyward in other p
- Since a screw turning in a nut advances only its pitch dista
- The kind of general interest which attaches to the tools we
- Mr. Walker also gives us a peep into the inside of one of th
- The portion of the line which unites Sacramento to Ogden, 74
- The first practically successful steamboat was constructed b
- The reason why the steamers which until lately ran between D
- The paddle-wheels were of a primitive form, and as they were
- One of the survivors, Mr. James May, a gunner, related that,
- we may consider that the more costly and ingenious and compl
- Having obtained the time, it will be easy to work out the le
- After a severe competition it appeared that the best weapon
- As the material of these Whitworth guns was very costly, and
- The Elswick establishment soon afterwards surpassed all its
- An extraordinary piece of ordnance is represented in Fig. 10
- A competitor to the Gatling presents itself in the Belgian m
- The Federal navy sustained several disasters from torpedo-bo
- The first notion of the automobile torpedo appears to have o
- As we have already seen, the idea of opening a waterway betw
- Since the two seas have joined their waters, a strong curren
- Mr. Saabye, an American engineer, who examined unofficially
- The Britannia Bridge, which carries the Chester and Holyhead
- The great Forth Bridge, now (December, 1889) approaching com
- A little more than four years after the opening of the Forth
- Each of the machines erected by König for the “Times” printe
- The modern improvements in printing presses are well illustr
- With certain modifications in the proportions and arrangemen
- A famous example of the application of hydraulic power was t
- A plan of conveying, not telegraph messages, but parcels, wa
- Several forms of rock-drills, or perforators, have been cons
- These machines are peculiarly suitable for submarine boring,
- The great tunnel of the St. Gothard passes from Gœschenen, o
- Let us suppose that from a railway terminus trains are dispa
- That light moves in straight lines is a statement which is t
- Instruments of various forms have been devised for examining
- Let it not be supposed that such scientific conclusions as t
- A very elegant instrument, made by Mr. John Browning, of the
- There is another branch of this extensive subject to which w
- In the hands of Mr. Norman Lockyer the science of the physic
- As to the nature of the rays themselves, Dr. Roentgen reject
- This extreme mobility of the eyeballs more than compensates
- Everybody knows that, however well the flat picture of an ob
- There is a property of the eye which has led to the producti
- The elementary phenomena of electricity are extremely simple
- The reader who desires to study the mutual action of current
- These very remarkable phenomena were discovered by the illus
- But the importance of this invention consists in the facilit
- An ingenious plan was devised by Jablochkoff for dispensing
- Both of these methods are used in the familiar and interesti
- Professor Lodge has devised an experiment which again shows
- The memorable discovery of electro-magnetism by Œrsted in 18
- The field telegraph instrument selected by the War Departmen
- Among the more remarkable forms of recording telegraphs, tha
- But the most striking achievements in connection with telegr
- A further step towards the speaking telephone may be illustr
- One of the best-known lighthouses on the English coast is th
- Fresnel also constructed glass apparatus for fixed lights. I
- But Daguerre’s process had no sooner been brought to perfect
- It now remains to describe in a few words a method of photog
- Excellent photographs of the planets have also been taken by
- The colour effects of nature have also been reproduced by ta
- From the first stone as many impressions of the sketch are t
- The linotype is not a type-setting and type-distributing mac
- The third electro-magnet of the apparatus represented in Fig
- as produced on musical instruments tuned to the concert pitc
- It might be supposed that animals which live entirely beneat
- There are, therefore, now on view at the Brighton Aquarium s
- In his book on South Africa, the late Lord Randolph Churchil
- Having now said sufficient about diamonds in general to give
- When the “blue ground” has come to the surface, how are the
- Aluminium was first isolated by Œrsted, in 1827, by decompos
- When first introduced by Deville, in 1854, aluminium cost £2
- FIG. 338.—_Portrait of Sir James Young Simpson, M.D._
- The extraordinary effects of ether and chloroform have intro
- The nature of the chemical changes which may be set up in an
- It may be thought impossible that vegetable matter should ha
- In the year 1847, Dr. Lyon Playfair directed the attention o
- The third class of constituents of coal-gas—the impurities—a
- It is singular also that Welsbach, in seeking for the most s
- This aniline prepared from commercial benzol always contains
- Although anthracene has already been named as one of the
- Before we proceed to give an indication of one of Dr. Joule’
- “The lightning is his slave; heaven’s utmost deep
- Valve, throttle, 6.