Elementary Rigging
17. Importance. The engineer often makes his own machines for use in heavy work and as substitutes for tools and machines that are unavailable. The machines are simple, but they save much labor. By rigging is mean the handling of rope manila or wire and chains with blocks and tackles to raise, move, or hold heavy loads. The combinations which the engineer rigs up with rope are really simple machines. This chapter explains the principles and methods of rigging, which will be one of your most...
Characteristics Efg
Type in
Info Rql
Steel making is today one of the exact sciences, the proportion of carbon or other hardening element being carefully controlled to produce special material best adapted to its particular purposes. Yet no existing process has been perfected to the point of absolute, unfailing uniformity. Large plants employing quantities of steel must make laboratory tests of every batch obtained from the mill to determine its suitability and methods of treatment. When this fact is realized, it will be readily...
Info Dxs 1
Gas checks must be quite shallow and their function is limited to protecting the base of the bullet and preventing gasses from melting or getting past the base. If they are made deep, they become in effect bullet jackets and present problems that can not be overcome with ordinary handload- ing tools. The writer has done at least a limited amount of experimenting with deep gas chccks and the results have been very unsatisfactory. It is impracticable, if not impossible, to get a tight enough...
Notch Back Img
a hi n down, the target should bs above the horizontal. This can be accomplished by piling cirt in the box or by placing a stake behind the target. h In construction, the target o simply nailed to the lid of a h.nged ammunition bcx rr.ortar. grenade, etc. and a rope is used to raise the lid of the box. u 1 The box should be buried in the ground and the soil placed into the box to provide stability. d A short length oi wire or string from the lid of the box to the rear edgs allows the ltd to...
Info Pxh
back of the newly formed choke. Cement a piece of No. 1 2 carborundum cloth to its surface, letting the edges meet without lapping. Use this like a cleanirg rod, drawing it back and forth the length of the barrel, but nor touching the cone or forward end of chamber. Push it forward until stopped by the shoulder of the choke, so as to taper it off gradually toward muzzle. This draw polishing should be continued until all humps and uneven places are worked out of the barrels to the point where...
Info Nwp 1
or less according to caliber. Let it soak a few minutes, pour out the water, and refill it again several times. Then get busy with a good wire brush and see what you shall see. If dry crusts show after the first scouring, soak it some more. If they still show, slip a foot or two of rubber tubing over the muzzle, and hold the barrel filled with water over a gas burner until the water boils hard hold the end of tubing up high to prevent the water running out. A few minutes boiling will loosen a...
Info Rul
out wood, just as in fitting the action into a new stock. If the smudges indicate the recoil lug has not a good bearing against the shoulder in stock, insert a metal place as described in Chapter 10. Then assemble, and set up the screws very tightly. In doing this be sure the screws are not too long so that their points bear against bottom of hole, stop them before they are exerting pressure on stock. If such is the case, grind or file off the points sufficiently to give them good tension....
Explosives Theory
OPENING LECTURE An explosive is a substance, made up up of various nitrates and chemicals, and when suitably stimulated, decomposes rapidly from a solid into a gas with the liberation of intense heat, resulting in a sudden and intense pressure causing violent disruption of the air and its immediate surroundings. I.E , one slab of TNT expands in the form of gas, in one second, approximately 18,000 times its own size in space. This rate of change, from a solid to a gas, is worked out in meters...
Assault Of A Fortified Position
62. Thk Problem a. A typical prepared defensive system of fortifications consists of a number of mutually supporting strong points, such as concrete emplacements called pillboxes. The best way many of these can be destroyed is by foot troops armed with special weapons. It's a difficult cornbined-arms job to which engineers are often assigned. It requires aggressiveness, skill, speed, teamwork, courage, and determination. This chapter outlines procedure for a simple assault on a single...
Info Rbf
piece of sheet asbestos 1 8 inch thick, with a 1 4 inch hole punched in it over this mark, and heat through the hole to a dull red with an acetylene welding torch. Spot both holes in this manner, lay the asbestos over them, and let them cool. This anneals the spots without affecting the heat treatment of receiver. An easier method, and one which Lyman recommends, is described in the circular packed with every Lyman 48 sight, and is briefly as follows First mark the position of screw holes, and...
British Switches
The pressure switch consists of the following parts - 1 Main casing and base plate. 2 Striker rod, block and spring. The main casing is made of brass. In the base there are small holes for attachment to any suitable surface. The striker and rod are made of cast iron 1 8 in diameter, reduced to 1 16 under the shear stud, which will break it under a point load of 30-40 lbs. A heavier striker is also available, which is 3 16 in diameter, reduced to 3 32 under the shear stud and will fire under a...
Plate Xiii
Commercial Metals and Alloys. Many handtoadcrs are situated in localities where they cannot buy tin or antimony easily, and they may wish to use scrap lead or commercial alloys of lead. When one reads of bullet alloys made of definite proportions of metals, the idea is sometimes created that it is necessary to be very precise about one's alloys. This is true in the case of an occasional rifle that may happen to be cantankerous. In general, any alloy that can be cast into 181 bullets which shoot...
Camouflage
40. What Is Camouflage a. Camouflage is a weapon one of the most important we have- It consists oi all the work we do to hide ourselves and our equipment from enemy observation. By means oi careful camouflage we can protect ourselves, confuse the enemy, cause him to waste valuable ammunition, or make him fall into a trap. b. Remember that if the enemy can't see us. he can't hit us effectively. If you learn to understand and to carry out the important principles of camouflage, you can give your...
Info Qom
line. Too much of this twist, however, will make the saw stick. If the cut runs far to one side, stop and cut off the piece as far as the cut goes, and start over again. A back saw is the thing for use in a mitre box, as the blade is held straight and rigid by the heavy strip of metal on the back edge. The back saw has very little set, and runs easily in a straight line. For the few jobs on which it will be needed, the gunsmith may dispense with back saw, using the cutoff saw instead. AUGUR...
Earl Naramore
Major, Ordnance Department Reserve The Army of the United States Sketch by LT. COJL JULIAN S. HATCHER Small'Arms Technical Publishing Company Onslow County, North Carolina U. S. A. Thomas G. Sam v orth September, 1937 The frontispiece illustrates a characteristic velocity and pressure curve plotted far different charges a3 explained on put 12S and 130. This Is a typical curve and does not represent figures published anywhere or for any definite rifle, cartridge or bullet. It Is seen that the...
Bullet Sizing And Lubrication
Bullets and their sizing and lubrication arc subjects so closely related to one another that it is impossible to consider them separately. Consequendy, diere is some overlapping of these subjects that can not be avoided, especially when lead alloy bullets are involved. Jacketed bullets, as made in the United States, require no lubrication nor do they have to be sized in any way as they arc made corrccdy for the cartridges they are intended to be used in. The .303 British service bullet which...
Specialists
i. Engineer Organizations. The Corps of Engineers does many differeAt. kinds of work. Much of this work is of a special technical nature. It is so technical, in fact, that whole engineer units companies, battalions, regiments are designed to do only one particular kind of job. Following is a list of some of the types of engineer units and what they do. a. Engineer general service combat units. The basic engineer units are combat troops of various kinds, and can be UsSed for any type of...
Info Ufz
Check List No. 3 Bridges, fixed and floating 1. Define following terms applied to bridges 2. Identify following parts of ponton, assault, and reconnaissance boats 3. Know how to carry, launch, ana paddle an assault boat silently. Know how infantry are loaded. 4. Know how to carry, launch, and p3ddle a reconnaissance boat. 5. Know how to carry, launch, and row a ponton boat. 6. Know how to repair a rubber boat. 7. Know how to carry balk and chess. ft. Know parts of abutment of any bridge and...
Info Jqm
it at that heat at which it is very dark, just before red begins to appear. Then remove from the flame and rub vigorously with a handful of rags or waste lightly saturated with a mixture of 2 parts boiled linseed oil and 1 part Marble's Nino-Solvent. At first the oil will smoke, and burn slightly. Work fast, and keep taking clean spots on the rag or waste, and continuing the rubbing until the oil stops smoking, and for a minute or two longer. The barrel will still be quite warm. Now scour Ihe...
Info Umz
is the best rust solvent I know of. This treatment will leave a slight deposit of brass from brush and scraper, which is removed by vigorous rubbing with curled hair such as is used in stuffing up holstery, or a piece of coarse woolen cloth, with plenty of oil. If the barrel smooths up nicely with a good deep brown color, very light bufl ng on a soft steel wire buffing brush will burnish it and improve the finish. Then heat the barrel by pouring boiling water over it until it is as hot as the...
Info Jww
made extra long at both ends, sp the aperture may be driven right or left as required, then the ends filed off even and the sight blued. Thc aperture was made by drilling in just the point of a 3 8 inch drill in the stock, which was afterward shaped up by filing. To attach, a hole is drilled in top of bolt sleeve, and tapped out for an 8 48 screw, the head of which is countersunk in the sight. The screw should be set in hot to assure a tight fit. The drawing 175B shows a better sight made by...
Becket Hitch
ends of the splice may be tapered by continuing the tucking process for two or three tucks, cutting out a few fibers from each strand after each tuck. Rolling the splice under the foot or under a board will make it compact and smooth. 24. Long Splice. The long splice must be used where it is necessary tb keep the increase in diameter to a minimum. It also has a neater appearance. The long splice is used to join ropes of equal size when the rope is to run through a block. a. Stage I Unlaying. To...
Baited Skewer
3 SkinrJng and cleaning. Aa aoon aa you catcb a flah cut out the glUs anc large blood vessels thst are neat to the beckhone. Scale It. Out the flah by cutting open I is stomach and acraptng it clean. Cut off the head unleas you want to cook the fish oo a pit. Flah like catfish and sturgeon have no acalee. Silo them. Small fish under four lnchea require no gutting, but ahould be scsled or skinned.
Small Leak
BAD leak PUNCTUM TKWZK Chapter Three is inseparably associated with them. The composition of black powder varies only slightly in different countries, the proportions being about 75 fo potassium nitrate saltpeter , 10 sulphur, and 15 charcoal. The nitrate and sulphur must be of exceptional purity and only a few woods are suitable for making the charcoal. As a boy, the writer used to make his own black powder of about a 60-20-20 mixture. The saltpeter used was the ordinary commercial product and...
Info Lhn
48, and the same adjustments are used. The base of sight is milled from a block of steel which has the same inside cuts as the bolt sleeve, which it replaces. To fit this sight it is only necessary to dismount the bolt, and discard the sleeve then reassemble, using the sight base as a sleeve it interchanges perfectly. The only fitting required and it is seldom needed is a bit of stoning on the point of the sleeve latch, to make it fit easily into the small recess in end of bolt. Whelen and Howe...
Info Dsi
The quenching bath should be clean, cool soft water. Arrange a wire mesh screen six or eight inches below the surface, and from bottom of tank bring up a pipe connected with an air pump, so that a strong jet of air may be injectcd while dumping. If possible, also have a supply pipe carrying fresh water in near the bottom, with an overflow pipe near the top, to keep the water at uniform temperature. Hold the box almost at the surface of water and dump quickly. The wire mesh catches the parts...
Xj Target Reconnaissance Report Guide
General Description Propossd Action _ Route To and from target areas, approach and withdrawal routes, rallying points. xxiitelOQ flupport Biles, CicScHltca and flrul iseemfcly areas may M . selected. Requirements Determine arsllalilllty before recon Unusual features ot site Guard system _ Labor and time estimate required for bypass or repair Situation map sketch orerbead ftew Magnetic north, principal terrain concealment, avenues of approach to tar jet, direction of enemy, etc. Line drawing of...
Info Cwj 1
hereafter. If this should happen, sometimes the tap can be worked out by light blows on its edges with a small prick punch, but usually it is necessary to leave it in the hole, grind off any projecting point, and drill another hole a quarter of an inch away. Having successfully tapped out the hole with no accident, set the block in place and turn in the screw. Now mark the position of the second screw hole, remove block, drill and tap hole. Set block in place again with screws in snug, and...
Info Ovv
basic solution Chapter 20 without affecting balance of receiver. The projecting ends of screws and pins must be dressed down inside the receiver, and for this purpose the dental engine with small carborundum wheel is indispensable in fact, I know of no other way of doing the job. The screws could easily be filed off, but the pins are hard and must be ground. The Noske mount base is attached in exactly the same manner, except that it usually comes with the holes already drilled, which makes it a...
Info Nzr
haps others. Here the barrel is left entirely free from the wood, touching nowhere. The handguard and forend are bound together by two or more bands, and the barrel has clearance of at least 1 32 inch all round at the muzzle I believe Captain Grossman's old favorite target Springfield by Wundhammer is stocked in this manner the band encircling both forend and handguard, and the barrel entirely free from contact with the wood. Having successfully inletted one or more Springfield stocks, the...
Powder
Gun powder or Black Powder as it is often called, is the oldest propellant known for use in fire arms. As made for small arms, it is usually a mixture of potassium nitrate, sulphur and charcoal. Sodium nitrate is used in place of potassium nitrate in blasting powders which, by the way, should not be used in small arms ammunition as the sodium nitrate makes the powder more violent in its action. It also increases the tendency of the powder to gather dampness and is more difficult to ignite....
Info Viq
reason tor using linseed instead of a thin oil is that it will not damage the wood around the parts. After cleaning, wipe the remaining oil off with a soft cloth, then rub with a soft chamois. One should enter advisedly upon the cleaning up ox REFINISH-ING OF AN OLD STOCK. Like various metals, wood also acquires a rich dark patina with age and use and its appearance is far more appropriate on an antique arm than a finish that looks like it might have been done yesterday would be. Quite likely...
Holzmine Antitank
This wooden box mine contains 11 lbs. of explosive, either poured or in molded blocks. A pressure block protruding through the lid operates the igniters by pushing out the safety-pin. The mine functions when a pressure greater than 400 lbs. acting on the pressure block shears two small wooden dowels and allows the pressure block to move downwards and operate the igniters. b Take out the pressure block. c Make sure that the shear block is firm, otherwise, discard the mine. d Remove the exploder...
Girin Hitch Cn A Frame 1
is applied. The upper end of the A frame should be laid across the hood of the vehicle and the attachment made as in Figure 3. If the nosed truck is equipped with a winch, the winch cable snould be rigged for a 2-to-l mechanical advantage, with the end of the cablc secured to the apex of the A frame. If a separate truck is needed because the nosed truck has no winch, a block should be attached to the apex of the MA frame and a 2-to-l mechanical advantage rigged from the truck emplaced in front...
Rifle Barrel Design And Fitting
WE debated a long time as to whether we would include in-siiuetiuus for boring, reaming, and- rifling barrels in this book, and we decided not to for several reasons. These operations are a separate art in themselves, and a very specialized art in these days. To describe them would require several hundred pages, and peating Arms Company, the Niedner Rifle Corporation, and several such description would be intelligible only to a trained machinist small barrel makers. It was also used at Rock...
Disarming Methods
a. Neutralization. Neutralization, the making of a dangerous boobytrap safe to handle, involves two steps 1 disarming or replacing safeties in the firing assembly, and 2 defuzing or separating the firing assembly from the main charge and the detonator from the firing as sembly. If neutralization is not possible, the boobytrap must be destroyed. b. Destruction in Place. A boobytrap may be destroyed in place if some damage is acceptable, as is generally the case out of doors. An operator, may...
Cardboard Cylinder
Commercial or improvised Blade Powder. 1. Tape cardboard or heary paper into a cylinder approximately 1 2 the diameter of the tin can or other container. 2. Insert the fuse into one and cf this cylinder, pack tightly with black powder and tape the ends closed. 3. Insert the cylinder Into the can a shown in Figure 23 and surrousd with bolts, nuts, metal scrap and or stones. Closa the can with a lid which has a holt in the center for the fuse to pasa through. Li the container used has.no lid. It...
MfflSLfifrcVo sg
Total weight of mine 8 lbs. iwith spider 8x4 body . Explosive filling A 1 2 lbs. TNT or Baratol. Minimum safe spacing, 2 yards. Arming. Remove spider, metal cup and washer as with the MK V. Examine shear wire of fuse and withdraw safety pin at arms length and leave on top of mine body. Place No. 3 fuse in mine. Replace metal cup, washer and spider. Engage studs in slots, cover and camouflage. Disarming. Remove spider, metal cup and washer. Inspect shear wire and insert safety pin. Remove No. 3...
Info Ltp
experienced gunsmiths also, may prove of interest even though the average amateur gunsmith may never be called upon to re-solder a loose rib. Here's the way they do it up at Ithicky, most other factories employing substantially the same method The barrels, or tubes arc first cleaned, then dipped into melted tin so as to completely coat each barrel all over, barrels being closed at both ends with wooden plugs. Next, both upper and lower ribs are dipped in tin and completely coated also. The two...
Chemical Delay Igniter
This consists of an aluminum body containing a cocked striker which is retained by a celluloid disc. When the igniter is armed, a quantity of acetone is released to surround the celluloid disc, which, after a certain lapse of time, is sufficiently softened to allow the release of the striker. Use plastic today . Different times of delay are indicated by the color of the threaded portion in the middle of the igniter body. From a limited number of tests, the following times have been obtained -...
Plate V
53 Cracks sometimes occur in the bottom of primer pockets. Tins defect is traceable to the use of mercuric primers and is, I believe, limited to folded head cases such as are used in much of our present day revolver ammunition. As primers should never be seated without inspecting the primer pockets first, this defect will be easily observed. Its effect is to permit an excessive amount of gas to reach the primer, driving it back violcntiy against the recoil plate of the revolver, setting back or...
Il Patrol Leaders Order
a. Enemy forces Weather, terrain. Identification, location, activity, b. Friendly Forces Mieslon of next higher unit, location and planned actlona of units on right and left, fire support available for patrol, mission and routes of other patrols. c. Attachment and Detachments. 2. MISSION What the patrol Is going to accomplish S. EXECUTION Subparagraph for each subordinate unit. b. 9peclfio duties of elements, teams, and individuals. 1 General and epeelal organisation. 2 Uniform and equipment...
Poncho Material
and the backing sheet under he top sheet, of nv erlay paper and formulate the plan. Remove the map and reposition ihe backing sheet under many as eight layers of overlay paper then retrace ynur plan from the original overlay shuet ustnjj a ball poirt pen with heavy pre nurc. The reproduction joo i then finished. Remove the holding plate, cov r sheet, sheets of overlay and carbon paper above the backing sheet and reassemble Tor future use.
Info Jio 1
is plenty of good screwdrivers in sizes to fit all the frame screws. Nothing so quickly spoils the appearance of any gun as gouged and battered screw heads. Sci wdrivers cost little to buy, and are easy to make and one should not hesitate to grind the point of a driver to the exact size of a particular screw Blot. The tool will not be injured, but may be re-ground a number of times and it's quite possible a new screw might cost you more than several screwdrivers- DISMOUNTING LOCKS To the man...
Info Tmg
is careful in his selection be may choose quarter sawed walnut for his stock with most pleasing results and without any danger of breaking, for good walnut possesses an ample margin of strength, particularly if the stock pattern is properly laid out on the wood with due regard for direction of grain. Figure 40 shows the ideal selection of a piece of walnut for a stock blank and the proper method of laying out the pattern. It is not at ail unusual that a piece can be found curly at one end, the...
Info Trw
higher in price than the Goodell-Pratt. They are, however, heavier in construction and should stand up to more accurate work. They are supplied both in hand and power drive. The beginner may be tempted into the purchase of one of the portable electric drills, often supplied with a rack on which they may be mounted to serve as a bench drill. I would strongly advise against such an arrangement. These drills are noisy, and have lots of play due to the gearing. They are fine to throw around under...
Platter Flower Pot
Machinery may be made inoperative by shearing its drive shaft. To make the diamond charge Figure 7 . rut a piece of tinfoil, paper, or burlap Into a diamond shape, with the long axis several inches longer thaa the circumference of the shaft to be sheared. The short axis should be about 1 2 the length of the long axis. Mold a plastic explosive over the diamord and place blasting caps into the explosive at the short axis points. To cut regular steel, the explosive should be about 1 4-inch thick...
General Description And Comment Mmn
The Venus flytrap can js a variation of the Venus flytrap pit described on page 81. The flytrap illustrated ia constructed of a metal container. An individual trapped In one of these devicoa should cut off or bend the barba downward before making any attempt lo withdraw his leg. ipikM BfttDGE PlOOR IS CLit AT IV MIDDLE AMD CO VEXED WITH MUD