ISBN: 9781231064122

Edition reliée

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 90 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purc… Plus…

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 90 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1862 Excerpt: . . . a fact recorded by Mr. Braddock: Humidity and dryness are well known to exert a great and opposite influence on gunpowder, and when it is heated by artificial means, and fired while it possesses a high temperature, the ranges of shot are amazingly increased. As it may sometimes occur in practice that a longer range may be required, while any addition to the charge might not be made effectual to promote it, it may be useful to state an experiment which seems to point out that the same weight of powder will produce this result, if it be only allowed to acquire an increase of temperature hefore it be used. One ounce troy of powder fired in a 4 inch mortar, shell)-. -, 81bs. , gave a medium range of. . . . . J One ounce of the same powder was heated in a copper pan to about 400 of Fahrenheit, and then fired as before, 242yards. gave a medium range of. . . . . . ) The following trials were made with a 24-pounder brass gun, at the same degree of elevation specified. The range is taken to the first graze of the shot. Here are too many coincidences to be the effect of accident, and therefore we may conclude, that in every case 4 lbs. were blown out of the gun unconsumed. The accession of a quantity of damp cannot alter the proportions of the ingredients, or abstract from their amounts: but it delays the progress of combustion, and retards the concentration of the fluid. We hear of cannon being loaded with 40 or 50 lbs. of powder, and the mind is at once deceived into the idea of the great tenacity of the metal of the gun; but the fact is, that probably after 1 lbs. that it would have made no difference on the metal were the rest of the 40 or 50 lbs. composed of sand or sawdust. Of a drier powder 12 lbs. , and of a damper powder 8 lbs. , would, probably, only be burnt. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 76 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1872 Excerpt: . . . The principal processes after proof are: --Sighting. Engraving, and c. , and c. , as for rifle M. L. gunsf (see page 111). Painting or browning. Nature of Tangent Sights and particulars of Graduations Foe Rifled B. L. Guns. Besides tangent sights, the Billed B. L. guns for S. S. down to 20-prs. inclusive, are supplied with wood side scales (giving 12 elevation and 6 depression) similar to those for S. B. guns. Note. --The metal heads of the sights are not to be polished, as it would eventually destroy their accuracy. Sights and Sighting. A B. L. gun being sighted on both sides has four sights, namely, two tangent sights and two trunnion sights. The 64-pr. (wedge) has in addition a pair of centre sights like the rifled M. L. guns, viz. , a short hexagonal hind sight and a short drop trunnion sight. The reasons why these guns are sighted on both sides, are as follows: --(1. ) The tangent and trunnion sights can be used at any elevation; for being placed at the side of the gun the muzzle of the piece does not interfere with the line of sight when laying, and therefore the additional ( In the 7-inch and 40-pr. the slope for the vent-piece to rest on, in loading, is cut by a shaping machine, after proof; and the side edges of the slot are very carefully rounded by hand, so as to fit exactly the under curve of the cross-head. scale graduated for the long radius for cast-iron S. B. guns is dispensed with in the case of rifled guns. (2. ) The issue of sighting instruments and spare sights to field batteries is unnecessary, for should a sight become unserviceable, no delay is caused by the preparation of another, seeing that the gun may be laid by the other side. (3. ) With guns mounted in forts or on board ships, in the case of extreme traversing, the sides of the embrazure or po. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 50 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: . . . and useful materials as gold and silver in the exchange medium. Once in a while, we would unlock the great doors of the vaults, sweep out the accumulation of dust and cobwebs, and solemnly go through the process of weighing and checking up the junk, to be sure that the rats had not eaten any of it. Our guides and watchmen got a deal of amusement in taking visitors down to the bullion vaults, for some of them were so awe-struck and impressed they could hardly speak in their vicinity. Figuratively speaking, I often felt like kicking them right off the premises and telling them to go to work, but we had raised them as loafers to be hidden away and have their work done by representatives or substitutes, and we had to pay the penalty of a little further delay caused by the weaning off process. As they became deprived of the artificial value which we had helped to place upon them by our monetary uses, they resumed their natural place in the list of commodities. They were not toadied to or worshipped as they had been before, but they were a great deal more useful. UNCLE SAM-GET OUT OF HERB, YOU LA2Y LOWERS j THE DENTISTS. JEWELERS. AND ARTISANS HAVE STEADY WORK FOR You ST BUSY!! l Being less in relative value than they had been, they were more easily obtained and at a less sacrifice of other things and it became possible for people to use them more widely in the various arts for which they are well adapted. That is a very interesting and logical explanation so far as it goes, interrupted Mr. Borden, but it is still not clear to me how you could do away with the metal currency, especially the gold coins, at that time. What did you do about the great qua. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 50 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: . . . and by keeping us a creditor nation help us to retain our position as bankers of the world which the war has brought about. It would seem that the post-war period, let us say for the first five years at least, will be an unusually busy one, probably an era of good stable and profitable business, and certainly an exceptional period in the non-ferrous metals field. Credit Where Credit is Due TRUE patriotism is always self-sacrificing but in the case of those who know the facts it is only fair and just that they make these public and credit given where credit is due. Thus, we deem it more than a part of our duty, in fact a positive obligation on our part to call attention to the fact that page 53 in our September issue calling attention to the Fourth Liberty Loan, which we now know to have been a tremendous success, was contributed and paid for by the J. B. Ford Company, Wyandotte, Mich. It was no part of our cooperation to omit the credit for this but by a printers error of omission, and negligence on our part in not insisting on a proof of this page that the proper credit for this act of patriotism was not given to the Ford company. Why This Issue is Delayed TO ALL our advertisers and subscribers an explanation is due for the unusual delay in producing this issue of METAL RECORD AND ELECTROPLATER. In general it is the intention of the publishers to have each issue off the press and mailed the latter part of the month, approximating the 25th although more often striking the last or next to last day of the month. On Saturday, Oct. 19, members of the Cylinder Press Feeders Union of New York, who were under contract with the Employing Printers Association of New York to work at a certain scale of wages until March, 1919, quit work without Serving any notice u. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 68 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: . . . forward and both are carried once more round the insulator and line wire, crossing the starting point and finishing off with six or eight twists round the line wire on both sides of the insulator (Fig. 130). Another method of tying a line into the top groove is shown in Fig. 140. This is the method used on the 60, 000-volt line of the Ontario Power Company. The long twisted portions are here intended to add to the section of the conductor (aluminium) so as to delay its melting through in case an arc should occur. Still another arrangement is shown in Fig. 141, where the binding wire is replaced by terminal clamps and the line is protected by a metal sheath slipped over it. Figs. 142 and 143 show a terminal clamp arrangement suitable for cases in which the line wire slants relatively to the insulator owing to considerable differences in level between the supporting points. The odd bits of wire cut off during binding operations must be carefully collected as they form a serious danger to cattle by becoming mixed with their fodder or by running into their feet. The longer pieces of wire also are favourite missiles for boys to sling over the line and are then liable to cause short circuits. In the case of suspension insulators the line wire is carried in a clamp cemented into the first member of the insulator chain as shown in Fig. 132. 13. JOINTS AND BRANCH CONNECTIONS ON THE LINE. In all cases in which the presence of a joint weakens the wire mechanically the branch wire must be relieved of all tension. The joint should, whenever possible, have the same strength as the wire, but, in any case, it should have a factor of safety of 2 considering the actual stress existing on the wire. The making of the joint must not weaken the main conductor, must not produce sh. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 96 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: . . . and delays, and annoyances, due to accidental irritations, or so-called burns or from suits for malpractice. A careful operator will not very likely have any such trouble, especially if he takes the precaution to always warn the patient of the possible danger, but it is always best to be on the safe side. Better to be much too careful than a little too careless. The cut (p. 159) shows a good combination of a tube holder and an adjustable protecting screen, which may be used in any position. The shield is made of aluminum, which is partially opaque to the rays, with a central shield made of sheet lead, which is very opaque to the rays. In the lead a hole may be cut of any desired shape or size, for the purpose of irradiating only a limited area, while the parts in the immediate vicinity are completely protected from the more powerful rays, and the parts more remote are also protected from the weaker rays by the larger aluminum shield. The stand of a shield should be of metal, to act as a ground to carry off the stray static currents or streamers, which may annoy the patient and cause him to move, which would spoil the result if a radiograph was being made. MANNER OF ATTACHING X-RAY APPARATUS TO THE STATIC MACHINE What is the technique of tube connections Disconnect or remove the jars. Ascertain the polarity of the machine. Place the X-ray tube holder in the desired position. Affix X-ray tube in tube holder, taking care that the anode will be in the same relative position as the positive pole of the machine, i. e. , if the positive pole is indicated on the left hand side of the machine, then the anode of the tube should be on the left, and vice versa. Connect the heavy insulated X-ray cords to the prime conductor posts and then to the . . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 64 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: . . . of the stripping solution. DEPOSITION OF GOLD ON IRON WIRE-CLOTH CATHODES. The electrodeposition of gold from cyanide solution is both theoretically and practically more difficult than that of silver. Theoretically the difference is to be judged by the electromotive force determinations of these metals in cyanide solutions. 0 Thus in 6. 5 per cent KCy solution gold is electropositive to silver by 0. 100 volt; in 0. 65 per cent KCy solution, by 0. 07 volt; in 0. 065 per cent KCy solution, by 0. 035 volt; and in 0. 0065 per cent KCy, by 0. 030 volt. This latter strength of solution is near the critical point at which both gold and silver become electronegative to cyanide solutions. Beyond See Christy, S. B. , electromotive force of metals in cyanide solutions: Trans. Am. Inst. Mln. Eng. , vol. 30, 1900, pp. 921-2. that point, while both metals remain electronegative, the silver becomes less so (less noble ) than does gold. Practically the extent of the difference by which gold is less easily precipitated from cyanide solutions than is silver increases more than the figures would indicate. This is shown by a study of the following experiment. DEPOSITION OF GOLD FROM GOLD CYANIDE SOLUTION. At the beginning of the test there was 22 liters of gold cyanide solution, containing 0. 198 per cent KCy, 0. 1 per cent KHO, and 3. 696 grams Au as KAuCy2. Fourteen bunches of five iron-wire cathodes were used. The flow was at the rate of 8 liters per minute, or 480 liters per hour. The mean area was 4 square feet. The results are shown below. Results of electrodeposition experiment with gold cyanide solution. a Note interruption of current for half an hour. Here the electric current failed, cathodes were removed and drained. After delay of one-half hour the current came on a. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 68 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. Excerpt: . . . of our Section. Yet improvements they said were still possible and should be made while we were at the park. We were to take care of a service of evacuation of sick in that district and at the same time try out a heating system. The Medical Inspector issued orders to equip two ambulances and report the results. Our Section Director designed a system which uses the exhaust of the motor through two metal boxes, which arrangement warmed the air within the car and also forced the circulation of fresh air. This was installed in two cars and found to be very satisfactory, for in all kinds of weather and temperatures the temperature of the ambulances could be kept between 65 and 70 Fahrenheit. We were at this place in all six weeks, including Thanksgiving, Christmas, and New Years. Our work consisted of evacuating mcdades, and at first it offered a fine opportunity of teaching the green ones how to care for their cars. But we were all soon put on our mettle. The outlying country was full of lowlands and streams which in many places during the hard rains covered the roads to such a depth that the usual type of French cars could not operate. Our car suspension was high, and we were able to perform a service the other cars had not been able to do. We established, too, a standard for prompt service, and during the weeks we were there it never became necessary that we delay a call for service on account of high water. We left this district for other work with a record of never having missed a call, and the promptness of service, day or night, was often a matter of comment by the French officials connected with this work. During the high water, certain posts accustomed to telephone for an ambulance would ask for an American Ambulance Boat, and the story was soon. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 50 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: . . . Such a sub-coating of zinc can at best only slightly delay the rusting of iron plated with brass, copper, nickel, etc. If this practice is to be followed the zinc deposit should be made as thick as possible, in order to lengthen its life when once it is exposed and begins to act as anode. What is needed is a non-porous coating of nickel, brass or copper. Whether or not this can be obtained without going to the extreme thickness found necessary in these experiments is for someone of wider experience than the writer to say. Porosity of Electro-Deposits The prompt rusting of the iron beneath the thinner deposits of all the metals except zinc seemed to indicate either that such deposits are porous in structure, or that there are small holes at certain points which leave the iron exposed. To study this question use was made of an ingenious, yet simple, method employed by W. H. Walker for detecting holes in tin plate. A one and a half per cent. solution of agar was prepared, and to each hundred cubic centimeters of this 7 c. c. of a one per cent. solution of potassium ferrocyanide was added. The samples of plated iron were placed in a shallow glass dish and covered with the hot solution, which quickly set to As the weights of these samples were not recorded the thickness of the deposits have been computed from the ampere hours by comparison with other deposits. a stiff jelly. In a short time numerous blue spots appeared on the thinner deposits. With copper-plated iron the action is as follows: Whenever there is a crack or hole in the plating a galvanic cell is formed in which the exposed iron is anode, goes into solution in the ferrous state, and is precipitated as Turnbulls blue, just as when a solution of potassium ferrocyanide is added to the solution of a fer. . . This item ships from La Vergne,TN., RareBooksClub, New York / London:: Academic Press / Butterworths, 1957. A solid copy. Square and reasonably tight. Inner hinges are perfect. Corners are NOT bumped. WITHDRAWN stamp, and a few other library markings. Text pages are clean and crisp. No underlining. No highlighting. No margin notes. Contains a foreword, preface and ten chapters: 1) Introduction; 2) Physical and Chemical Properties of Glass; 3) Glass-Working Equipment; 4) Basic Glass-Working Operations; 5) The Manipulation of Large Tubing; 6) Some Operations with a Glass-Working Machine; 7) Metal-to-Glass Seals; 8) The Construction of Some Typical Single Pieces of Equipment; 9) The Assembly of Complex Apparatus; 10) The Manipulation of Silica. Illustrated with 85 figures/diagrams/graphs. Tables. Bibliographical references. Author Index. Subject Index. Bound in the original dark green cloth, lettered in gold on the spine and front cover. From the publisher: "With a little practice the scientist can make almost all the glass apparatus he needs with a considerable saving in expense and, which is often more important, without the delay which occurs when he depends on the services of a professional glass worker." . First Edition. Hard Cover. Very Good EX-LIBRARY./No jacket.. 8vo. xiv, 184pp.., Academic Press / Butterworths, 1957, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 114 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: . . . the trunk operator to clear the trunk. While this method seems very simple, and while it seems that the trunk operator should be just as diligent in clearing connections as she is putting them up, such is not the case. It must be remembered that at the instant when the subscriber operator comes in to order down a connection, another may come in to order one up. In fact, two or more operators may order up connections at the same instant. In such a case, the trunk operator will always pay more attention to orders to make connections than to those to clear. So that the trunk operator often puts off clearing a connection until she has forgotten about it. In the meantime, the subscriber operator at Ij, has cleared that end of the connection so that the called-for subscriber is left connected to the trunk without any means of signaling either one of the exchanges. This condition has two results: First, the called subscriber cannot signal the exchange to get a connection, and, second, nobody can call him because the trunk plug being in his jack, his line will be reported busy. All this necessitates a second request from the subscriber operator to clear the trunk, which multiplies the work done over the order wire, which tends to confuse the trunk operator and delay her work. It was found also that a grounded order wire was liable to become noisy, causing the transmission to become poor, and neces Pig. 213. sitating the repetition of orders over it, to the further detriment of the service. Two changes were made in the wiring, which are show-n in Fig. 213. The first was to use a metallic order circuit as shown, the busy test being obtained for the trunk operator through her split receiver to ground at . The second change consisted of wiring a drop a to the trunk at. . . This item ships from La Vergne,TN., RareBooksClub<