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: Unusual Tone Produced By Pneuphonic Horn Signals HE compressed air alarm signal, known as a pneuphonic horn, shown in the accompanying illustra- tion is produced by the Westinghouse Air Brake Co., Wilmerding, Pa. The device is simple in design, consisting of a counterbalanced metal diaphragm enclosed in a sturdy housing, and a pronze bell. Air entering the housing and escaping through a restricted out- Jet causes the diaphragm to vibrate rapidly. These vibrations release air waves that are greatly amplified by resonance in the bell, thus producing a sound of tremendous carrying power. While clearly audible at a great distance the signal produces no ear-splitting annoyanace nearby. The horn is easily installed and requires Type AA-1 Pneuphonic Horn Signal no adjustments. The only working part is the vibrator unit, a special bronze diaphragm, which is enclosed in a substantial weatherproof hous- ing. Two sizes are available, a small horn suitable for motor boats or yachts, and one of deeper tone for larger boats, tugs, ferries, etc. Single bell pneuphonics may be had, the double horn type, or the larger horns may be arranged in combinations of four or more bells. Air pressure rang- ing from 40 to 140 pounds is required, depending upon the size and number of horns and may be controlled direct- ly by a signal valve and operating cord, or from a distance electrically by a magnet valve and switch. New Type of Hatch Cover ls Introduced T, MEET the requirements of owners who prefer to keep the decks clear between the coamings and the bul- Warks, a new type of steel hatch cover has been introduced by MacGregor & King, Ltd. This new type is a fore and aft rolling and pivoting steel hatch ‘over. In the application of this piece of equipment to a double gang hatch, the side coamings are stopped under tWo central sections. Each of these central Sections rolls over the adjoin- ing outer section and the superimposed Pairs are then rolled out until the pivots on the lower sections engage in the half trunions fitted at the ends of the hatchway. When in this position they are near balance and can be Swung into a vertical position by hand tackle or winch. When stowed, the covers occupy about two feet in longi- tudinal direction and stand vertically one-fourth of the length of the hatch- way above the deck. In the use of this cover for single gang hatches, it is in two sections with stepped coamings. One-half of the cover is rolled on the other half and the two sections rolled out until the pivots engage in the half trunnions. The cover is then pulled into vertical stowing position by an ordinary ship’s winch and tackle, the height being half the length of the hatch from the deck and the pull on the winch about one ton. Advantages claimed for this new steel hatch cover are: Low vertical height in open position and with no interference with the handling of cargo; no special high or heavy stayed derrick posts or heavy winches are required; more than two-thirds of the hatch can be hand-opened in two minutes at sea or in port; the winch- man has a clear view down the hold; and the hatch is especially suitable for electric winches. Lift Truck Designed To Handle Tin Plate HE accompanying illustration Tr. a new lift truck designed for handling tin plate recently developed by Barrett-Cravens Co. 101 West Highty-seventh street, Chicago. This truck is a fork type, built 34% inches high to go under stacks of tin plate which are shipped on 2 x 4’s. With the life truck a pile of tin plate is lifted and trucked from the freight car to the desired storage space in the plant, eliminating piling in the car and un- piling for storage, which was formerly necessary. Lift Truck for Handling Tinplate MARINE REview—October, 1931 New Heavy Duty Expansion Joint Passes Tests N EXPANSION joint which in actual practice has passed the most severe tests is shown in the ac- companying illustration. The salient point of this joint lies in the fact that it has a permanent- ly fixed extension guide which is rigidly attached to the body of the joint proper. This precludes any chance of misalignment and hence preserves the packing in its concen- tric position with the sleeve proper. This not only eliminates leakage but makes the repacking simple. Another exclusive feature is found in the lubricating system. Alemite fittings lead a charge of zinc. oxide lubricating compound under pres- sure through a metal distributing ring, forming the lubricant into a Murfco Heavy Duty Expansion Joint thin film between the packing and sliding sleeve. Hence the packing is impregnated and preserved in a soft, pliable and resilient condition. Other features have been provided to eliminate expansion line trouble under the most rigid conditions found in present day high pressure and high temperature pipe line serv- ice. The Murfco expansion joint is made by the Murphy Machine Co., Philadelphia. New Cutting Torch Has Wide Adaptability NEW cutting torch known as Type CC and weighing only 46 ounces with tip attached has just been put out by the Bastian-Blessing Co., 240 East Ontario street, Chi- cago. Previous to being put on the market, this torch had 14 months of actual field tests under all condi- tions and with various fuel gases and developed unusual speed of cutting and low consumption of gas. The torch has an overall length of 20% inches from the base of handle to end of tip nut and is easy to handle in tight corners. Wide adaptability as to fuel gases and range is a characteristic of the new model, as a change in the tip makes the torch ready for use with acety- lene, hydrogen, carbohydrogen, oxy- acetylene and petroleum gases. 41