Pipe organ

“ Within Festival Hall is one of the half-dozen greatest organs in the world. It has more than 7,000 pipes. The heaviest of them weigh as much as 1,200 pounds apiece. Though mere size is not the essential quality of a fine instrument, it is hard to ignore the real immensity of this. The echo organ alone is larger than most pipe organs. ”

“ Of course, an artificial mouthpiece has to be provided for our organ-pipe, but this is called the boot. See Figure 19, which shows the construction of a reed organ-pipe. A is the boot containing a tube called the eschallot B, partly cut away and the opening closed by a brass tongue C, which vibrates under pressure of the wind. D is the wire by which the tongue is tuned; E the body of the pipe which acts as a resonator. ”

“ The next step would be to combine a set of flutes or shepherd's pipes with the wind reservoir of the bagpipes, placing a little slider under the mouthpiece of each pipe which could be opened or closed at will, so that they would not all speak at once. Then some genius steadied the wind pressure by pumping air into a reservoir partly filled with water. This was the so-called "hydraulic organ," which name has given rise to the impression that the pipes were played by the water passing through them—which is impossible. ”

“ An organ pipe is a tube in which a current of air passing over the edge of a piece of metal causes it to vibrate, thus putting into motion the column of air in the pipe which then produces a note. The operating air is forced across the sounding piece of metal from a bellows. ”

“ And there, behind one of the gables, partly protected from the weather, he came upon a long metal organ pipe laid flat, and near it a large funnel-shaped object. A strong breeze was blowing from the south-west, but the organ pipe gave forth no sound. ”

“ In organ-pipes the air is agitated by causing it to issue from a narrow slit, and to strike upon a cutting edge. Some pulse of the flutter thus produced is raised by the resonance of the pipe to a musical sound.
When, instead of the aërial flutter, a tuning-fork of the proper rate of vibration is placed at the embouchure of an organ-pipe, the pipe speaks in response to the fork. In practice, the organ-pipe virtually creates its own tuning-fork, by compelling the sheet of air at its embouchure to vibrate in periods synchronous with its own. ”

“ Hope-Jones makes a stop which he calls Gravissima, 64-ft. Resultant, in his large organs. Many contend that this system produces better results than if pipes of the actual lengths of 32 or 64 feet were employed. Indeed, a pipe 64 feet long would be inaudible; the human ear has its limitations and refuses to recognize tone lower than 32 feet (just as we cannot lift water by a suction pump over 32 feet) —but, these great pipes produce harmonics which wonderfully reinforce the tone of the organ. ”

“ In the same way we can create in the closed organ-pipe by properly overblowing the pipe, a region about two thirds of the way up the pipe, where the pressure changes in the air are practically no greater than they are at the mouthpiece. ”

“ And if any pipe or pipes belonging to the above-named stops cannot be made to speak well and bear a good tone, strong, clear and sweet, either through want of substance or any other defect; that then in such case the said Renatus Harris, his executors or assigns, shall and will put in new serviceable pipes in the places of such as shall be found so deficient and not useful ”

“ On placing one end of it fitted with a socket into one of the holes in the wind-chest (in place of a pipe) and admitting the wind from the bellows the water is forced up the tube, and the difference between the level of the surface of the water in the two legs of the tube is measured in inches. Thus, we always talk of the pressure of wind in an organ as being so many inches.
[4] The organ in Great Homer Street Wesleyan Chapel, Liverpool, England, had manuals extending down to CCC. It was built for a man who could not play the pedals and thus obtained 16 ft. tone from the keys. ”

“ From this last will be seen how important it is that the pressure of the wind in an organ should be steady and uniform. Otherwise the pipes will speak a harmonic instead of the sound intended—as, indeed, frequently happens.
When a stop is labeled "8 ft.," that means that the bottom pipe, CC is 8 feet long and the pitch will be that of the key struck. A "16-ft." stop will sound an octave lower; a "4-ft." stop an octave higher. These measurements refer to pipes which are open at the top and are only correct in the case of very narrow pipes, such as the stop called Dulciana. ”

“ This in time led to the invention of the pallet, or valve, to control the admission of wind to each pipe, and by the close of the eleventh century we find it chronicled that there existed at Magdeburg an organ with a key-board comprising sixteen keys. From this time the name of the [Pg 15] instrument begins to correspond with our modern idea of the same; its invention was a realized fact, although but a germ of that development which has since raised organ-building to its artistic importance. It must be borne in mind that the pedal organ, with its keys for the feet, was a much later invention. ”

“ The results already achieved have done much to make the most advanced organ rival the orchestra.
To exemplify the principle of the vowel cavities Hope-Jones was in the habit, in his factory in Birkenhead, England, in 1890, of placing the end of one of his slim Kinura reed pipes in his mouth and by making the shape of the latter favor the oo, ah, eh, or ee, entirely altered and modified the quality of tone emitted by the pipe. ”

“ I remember one incident which bears upon this part of the treatise. The gentleman who gave it to me had asked to see my tobacco-pipe; he examined it carefully, and when he came to the little protuberance at the bottom of the bowl he seemed much delighted, and exclaimed that it must be rudimentary. I asked him what he meant.
“Sir,” he answered, “this organ is identical with the rim at the bottom of a cup; it is but another form of the same function. Its purpose must have been to keep the heat of the pipe from marking the table upon which it rested. ”

“ You will be sensible that it is raising itself up at its labor, at every stroke, so determined is the exertion of its strength. The supply-pipes are termed arteries. One large arterial pipe comes out from the heart, and then sends out branches in all directions, very much like the water-pipes sent out from the great reservoir into all the houses of a town. The branch-pipes get smaller and smaller as they go from the main, until at last they are many times smaller than the smallest hair. ”

“ When the instrument is in use, the kidney lies between two delicate, exceedingly flexible membranes, which apply themselves closely to its surface and to the surface of the structures entering the hilus of the organ, and each of these membranes forms with each of the symmetrical halves of the box a chamber which is filled with oil and which communicates by a relatively wide flexible tube with the recording instrument. ”

“ It is curious to notice how our body is wrapped in membrane. On the outside, is the skin protecting from exterior injury, and, on the inside, is the mucous membrane reaching from the lips to the innermost air cell of the lungs. Every organ is enveloped in its membrane. Every bone has its sheath. Every socket is lined. Even the separate fibers of muscles have their covering tissue. The brain and the spinal cord are triply wrapped, while the eye is only a membranous globe filled with fluid. ”

“ Their number, at the first view, appears very considerable; for the organs within which they are reflected are numerous. [2] The stomach, bladder, urethra, uterus, ureters, the intestines, &c., borrow from these membranes a part of their structure: nevertheless, if it be considered, that they are continuous throughout, that everywhere they are observed to be extended from one organ to others, arising, as they did at first, from the skin, their number will appear to be singularly limited. ”

“ We still occasionally see and hear this instrument in our streets, performed upon by those nomadic "sons of art," the organ-grinders. The per [Pg 14] former being obliged to move his head continually from side to side, an unpleasant and fatiguing operation, soon led to an attempt to blow these tubes artificially. From this resulted the placing of the pipes upon a small wind-chest, and the addition of a primitive bellows, the whole being easily carried and operated by one performer. ”

“ Now, when we breathe, we first make the insides of our chests larger by drawing their walls and floors further asunder. Then we make them smaller by drawing their walls and floors once more nearer together. When the chest is made larger, fresh air rushes in through the mouth and wind-pipe, and through the twig-like branches of this pipe, until it fills a quantity of little round chambers which form the ends of those branches. The wind-pipe branches out into several millions of fine twig-like tubes, and then each tube ends in a blind extremity, or chamber exactly like this. ”

“ One, the gullet, has only to swallow solid food or drink, so that its walls can remain soft, and indeed fall together, except when it is actually swallowing. The other tube, the air-pipe or windpipe, has to carry air, which neither will fall of its own weight, nor can readily be gulped down or belched up. It is absolutely necessary that its walls should become stiff enough to keep it open constantly and let the air flow backward and for{136}ward. So we find growing up in the walls of this air pipe, cells which turn themselves into rings of gristle, or cartilage. ”

“ The writer is not aware who first introduced into the organ a rank of soft-toned pipes purposely tuned a trifle sharp or flat to the normal pitch of the organ, so as to cause a beat or wave in the tone. Fifty years ago such stops were sparingly used and many organists condemned their employment altogether. Stops of the kind were hardly ever found in small organs and the largest instruments seldom contained more than one. ”

“ We have seen, then, fine injections pour out upon the serous membranes, upon the pericardium, the pleura, the peritoneum, &c. transude upon the mucous surfaces, even upon the skin. We have seen them flow through the ureters, the pancreatic, biliary, salivary ducts, &c. Haller, in the article upon each organ, has not failed to relate examples of this sort, which prove the communication of the arteries with all the other vessels, by means of the capillary net-work. What anatomist has not sometimes made even coarse injections return by the veins? ”

“ To most organs in this country, to many in Germany, and to a few in other countries, there is attached a balanced shoe pedal by movement of which the various stops and couplers in the organ are brought into action in due sequence. By this means an organist is enabled to build up the tone of his organ from the softest to the loudest without having to touch a single stop-knob, coupler or combination piston. The crescendo pedal, as it is called, is little used in England. It is the fashion there to regard it merely as a device to help an incompetent organist. ”

“ The lungs appeared in a normal state. The stomach contained about forty grammes of a thick, yellow, slimy liquid; and here and there parts of the mucous membrane were inflamed. The œsophagus, the intestines, the liver, the spleen, and the kidneys, were in a normal state. The epithelium was easily detached from the tongue; the base of this organ was red and slightly excoriated. The brain was more injected than its enveloping membranes; the pons varolii was the same as in the second experiment.
Fourth Experiment.—I applied on the eye of a dog of moderate size one drop of nicotine ”

“ For this purpose may be used a bladder, marked g, which is provided with a cock and pipe fitted or screwed to the board of the inspiring valve and bag of the bellows. If, therefore, after opening the cock, the machine is set in motion, it will extract the pure air contained in the bladder, and, on the subsequent compression of the bellows, force it into the lungs of the patient. ”

“ Thus heart trouble, lung disease, brain, liver, womb, tumors of the abdomen and through the list of ef [Pg 125] fects can be traced to the diaphragm as the cause.
I am strongly impressed that the diaphragm has much to do in keeping all the machinery and organs of life in a healthy condition, and will try and give some of the reasons why, as I now understand them. First, it is found to be wisely located just below the heart and lungs; one being the engine of the blood, and the other is the engine of the air. ”

“ The pipes put into these small organs were flue pipes, their intonation must have been very unstable owing to the irregularity of the wind supply fed by a single bellows, the pressure being at the mercy of the performer's hand. Increased pressure in pipes with fixed mouthpieces, such as organ pipes, produces a rise in pitch. ”

“ Removal of the clamp and raising and lowering the bottle thoroughly irrigates the pleural cavity. This being accomplished, the patient holding his breath in expiration, and the clamp again applied, the irrigating bottle is removed, and a short hard rubber tube connected to the outer end of the drainage tube. This hard rubber tube has a soft rubber diaphragm which acts as a check valve, effectually preventing the ingress of air during inspiration, but in no wise interfering with the egress of fluid from the pleural cavity during expiration, fits of coughing, etc. ”