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Equipment Used Afloat and Ashore Radio Telephone—Deaerating Heater — Insulation—Gasket —Radio Compass — Adjustable Piston—lHold Ventilator now possible by means of a new transmitter for a radioman on a coastal or ocean-going vessel to select any one of ten frequencies by merely giving a telephone dial one twirl and waiting an instant for it to snap back. The frequency shifting device resembles a miniature tele- phone board serving ten dial tele- phones, The transmitter represents the latest developments made by Bell Telephone laboratories in Western Electric aviation and _ ship-to-shore radio equipment. Automatic con- trol is so complete that the user’s voice may be made to put the trans- mitter on or off the air instantly or to shut it down completely after an interval of from one to 15 minutes. Any ten frequencies in the high frequency range of from 2 to 18 megacycles are available. A quick shift of frequencies is important in ship-to-shore radio telephone serv- ice where transmission conditions require the use of different fre- quencies for satisfactory communica- tion depending on time of day and the distance to be covered. : USING the radio telephone it is New Deaerating Heater SPECIAL type deaerating heater for use in marine sery- ice has been developed by the Elliott Co., Jeannette, Pa. This de- aerating heater gives the same ideal performance on shipboard as is ob- tained in heating feedwater by direct contact in conventional stationary types. By removing dissolved gasses from the feedwater, corrosion in boilers, feedlines and steam _ lines, is prevented. The feedwater is heated exactly up to the saturated steam temperature. This new marine type deaerating heater shown in the accompanying illustration is being installed, on two large oil tankers. It has a capacity of 54,000 pounds per hour and is designed for smooth, continuous, un- varying performance on _ shipboard where it is subject to the roll and pitch of the ship. The deaerating element is of special design and is particularly efficient. Flexibility of design is employed so that the heaters can be fitted into the space available on _ shipboard. Because of ample headroom in the case of the oil tankers, the heaters furnished were built along conven- 28 tional lines with vent condenser on top and storage tank vertical. The deaerating heater heads are of the non-storage type, made of cast iron to give maximum resistance to corrosion. This was considered of more importance than the dis- advantage of the extra weight over steel plate. Standard material for the shell and end heads of the de- aerating heater is copper bearing steel or Armco ingot iron, as prefer- red, for the primary reason of min- imum weight. If the importance of greater corrosion resistance is suf- ficient to offset the disadvantage of added weight, cast iron can be used as in the unit illustrated. Storage tanks are always of copper bearing steel or Armco ingot iron; vent con- densers of steel plate or cast iron. Water storage tanks of ample capacity for each application may be of the vertical or horizontal type, to meet the specific limitations of space New Type Deaerating Heater Installed on Two Cargo Oil Tankers MARINE REVIEW—January, 1935 available. Support arrangements are welded to the storage tank for any desired type of mounting. The design and construction of the equipment meets all requirements of the latest A. S. M. E. code for class 2, unfired welded pressure vessels, as well as the requirements of the American Bureau of Shipping and United States Steamboat inspection. W aterproofed Insulation EFRIGERATION is a_ universal fe need on shipboard in lesser or greater degree. A new low density insulating material sealed against moisture recently introduced by the Insulite Co., Minneapolis, Minn., should therefore find useful applica- tion in the marine field. It is de- signed specifically for use in connec- tion with cold storage spaces, The new material differs from the company’s standard insulation only in the special treatment it receives after fabrication. This treatment, it is said, forms a complete seal or en- velope, which is an integral part of the insulation and which acts as a water-proofing medium while provid- ing a tough, durable surface and a foundation for the final asphalt coat- ing applied on the job. It is furnished in all standard cold storage thicknesses and in_ sizes economical in application. The company recently prepared a com- prehensive booklet describing the new product and its regular line of cold storage insulation. Plastic Gasket Seal NEW plastic gasket seal has been developed by the Bond Electrie Corp., Jersey City, N. J. This new product, it is said, produces permanently leakproof joints which withstand vibration, high tempera- tures, high compression, water, gaso- line, and oil, The material sticks tightly to metal and all gasket materials, yet retains enough -plasticity to permit ready removal of head gaskets. In using, a thin coating is applied on the surfaces that have been cleaned with gasoline and _ scraped until smooth. Bolts and screws are then tightened. keeping an even pressure. For head gaskets and other extra heavy duty joints, the material should be allowed to dry a few min- utes before tightening the bolts or screws,