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does not interfere with work. For smaller, more superficial wounds than the above a useful dressing, better than the questionable court plaster, or even adhesive tape, is collodion, to which has been added aristol or iodoform (50 grams to the ounce). A small glass rod, the ends of which have been made smoother by melting with a blowpipe in an alcohol flame, makes a convenient applicator for the collodion. Pass it through the cork and leave it in the bottle permanently

For Wounds and Painful Injuries. In case of a deep wound the collodion dressing is not applicable and the soothing properties of a moist dressing are desired. Pour a measured quart of water into the basin to be used. Gauge the quantity with your eye. Throw out the water and sterilize the basin (as above) by pouring a little alcohol into the basin and rolling it about to wet all the inside. Set it on fire with a match and the basin is thoroughly sterilized. Pour a quart of water that has been boiled directly from the teakettle into the basin. One tablet of bichloride of mercury (as usually prepared) makes a 1 to 2000 solution when added to the quart of water. Sterilize another smaller basin by the method described above and pour a part of the solution into it for later use. Cleanse the wound as thoroughly as conditions permit.

Hydrogen peroxide of full strength or diluted with water is usually sufficient. If the wound is very dirty and much lacerated. as machinists' wounds are apt to be, the following method of cleaning is perhaps better:

Add to 1 quart warm water in which the wound is to be washed 2 teaspoonsful lysol. (This makes about 1 per cent. solution.) Lysol has an odor similar to carbolic acid, but is not so poisonous. It forms a soapy solution, hence its value as a cleansing agent. It numbs the parts and makes them less sensitive to pain. The part should now be thoroughly irrigated with the bichloride solution in the larger basin, being sure that all the lysol solution is removed from the wound.

Surgically clean gauze (sterilized, aseptic) is now bandaged over the wound and moistened with the clean bichloride solution saved in the smaller basin for this purpose. Bandage lightly. If the gauze dries and the wound becomes painful inside of 4 hours, remove the outer plain bandage and moisten the gauze with the

solution again. Use weaker bichloride of mercury solution for the next and succeeding dressing (1 to 4000). If too strong, the healing granulations may be retarded.

Home Made Aseptic Gauze.-Plain aseptic gauze (absorbent) may be prepared at home by the following methods: For each five yards of ordinary cheese cloth use one-quarter pound common washing soda to sufficient water to cover the gauze. Boil for one-half hour and rinse in several changes of water to remove the soda. This process removes the fat or oil from the fabric and makes it absorbent. After it has been dried it is cut into suitable sizesstrips one yard long and four inches wide are convenient. The gauze is sterilized and packed ready for use in the following manner: Screw top jars with caps are placed in a large bread pan, and the gauze is arranged loosely in the other end of the pan. Place in the oven and bake until the gauze begins to scorch slightly. Remove the pan and all to a table and while hot pack the strips into the jars. Use a pair of forceps or long tweezers and a short wire for this purpose. The tips of the tweezers and wire should be made sterile by passing through an alcohol flame several times, or they may be sterilized by baking with the jars and gauze. Seal the jars and you have a good supply of aseptic gauze ready for instant use. When using the gauze it is well to remove the strips with a pair of tweezers, the tips of which have been sterilized in an alcohol flame. This avoids possibility of contaminating the gauze left in the jars. A quick convenient alcohol flame may be had by saturating a small pledget of cotton in the mouth of a bottle.

Moist bichloride gauze, which is expensive to buy, yet invaluable in case of accident, is made as follows: Prepare and pack the gauze as above. Then prepare a 1 to 1000 solution of bichloride as just explained (burning out the pan with alcohol and using boiled water). Pour this solution over the gauze in the jars until it is thoroughly saturated and allow it to stand for 24 hours. Pour off the excess and seal it air-tight. If dry bichloride gauze is desired prepare the gauze as above, dry it thoroughly in the oven and repack. However, the moist gauze is to be preferred. In using this gauze observe the precaution stated above, i.e., use weaker

antiseptics after 24 hours and for subsequent dressing. Moist picric acid gauze for burns may be made and kept in a jar for im mediate use as follows: Prepare and pack aseptic gauze, as above. Prepare a picric acid solution in the manner described (1 to 200) and pour it over the gauze. Let it stand and then pour off the excess and seal it air-tight.

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CHAPTER XIII

HINTS AND KINKS

Hacksaw Blade Reflector-Holding Polished Pipe-Easily Made Soft Hammer Straightening Shaft on Planer-Holding Small Work Without a ViseHolding Small Work in Vise-Putting on Tools-Illuminated MagnetRemoving Keys-Truing Crankshaft-Repair of Broken Gear Case-Simple Priming Device-Coal Gas for Engine Testing-Warming Manifold for Easy Starting-Stopping Fuel Pipe Leaks on the Road-Use of TapSome Threading Kinks-Removing a Stud-Removing Stubborn NutUse of Nuts and Bolts-Placing Nuts in Difficult Places-Forming Rod Ends-Winding Springs in a Vise-Cutting Sheet Metal-How to Make a Wiped Joint Forms of Keys-How to Make Keys and Keyways-Woodruff Key Sizes-Nut Locking Means-Shop Uses of Arbor Press and Wheel Puller-To Make Wood Acid Proof-Sharpening Old Files Cheap Blackening of Brass-Heat Proof Paint-Etching-Use of Tools-Drilling Holes in Glass-Making a Magnet of a File-Peculiar Cause of Knock ing-Rust on Tools-Screw Cutting Gears-Restoring Dull Polished Iron or Steel-Speed of Grindstone-Cleaning Brass Castings-Pipe Joint Cement-Drilling Hints-Body Polishes-Care of Tops-Leather Upholstery-Cloth Upholstery.

Hacksaw Blade Reflector Useful.-When sawing metal with a hacksaw and trying to saw it to a line which has been scribed on the surface the task is found very difficult unless there is good light. A workman in a shop where the writer was employed made a reflector for his saw so that it could throw a good light on the work. A round disk of brass was made as shown at Fig. 468, B. The disk was turned so as to have a collar at the back; a slot was cut through the center of disk so that it could be slipped over the saw. A 16-inch set screw in the collar served to hold the disk in place while in use. Some white enamel was spread over the face of disk to provide a good reflecting surface. A better reflecting surface would result if the disk were nickel plated.

Holding Polished Pipe in Vise.-A very good way to hold pipe or rods having a polished surface is to sprinkle dry plaster of Paris on heavy paper and roll in this paper the article to be held, having plenty of powder between the paper and the polished surface. Place the roll between blocks of wood having hollow faces and clamp firmly in an ordinary bench vise. When removing the paper, if the plaster adheres to the pipe in hard cakes, do not scrape but wash the surface in clean water, which will loosen the plaster and

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Fig. 468. Straightening Shaft on Planer at A. B-Hacksaw Reflector. C-Holding Small Work Without a Vise. D-Holding Polished Pipe. E-Holding Small Work for Filing. F-Making Soft Metal Hammer.

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