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~ Equipment Used Afloat and Ashore Radio Room Clock Developed—Cleaning Compound—Grating—Tension Indicator for Quick Reading—Lighting Ocean Bottom—Pipe Fittings for Welding—Soldering lron N CO-OPERATION with the Chel- i sea Clock Co., the Radiomarine Corp. of America, 66 Broad street, New York, has developed a special radio room clock. The clock, il- lustrated herewith, has been espe- cially designed to facilitate transmi- sion of the alarm signal provided by the international radiotelegraph convention and the international con- ference on safety of life at sea. The Special Radio Room Clock alarm signal consists of 12 dashes, each four seconds long, with an in- terval of one second, to be trans- mitted during a period of one min- ute. The clock is provided with a sweep second hand and special red mark- ings on the dial, making it easy for the operator to accurately time the four second dashes and one second spacing. This is to assist in sending out signals of exactly four seconds’ duration in emergency. Such sig- nals, separated by silent intervals of one second, will operate automatic devices in ships within range and call radio operators to their posts if they should not be on watch. Other special markings are pro- vided to call the operator’s attention to the three minute silent periods which. must be observed by all ra- dio stations at 15 and 45 minutes past each hour. The movements are 7 jewelled lev- er escapement with compensation balance, Brequet hairspring, cut wheels, cut steel pinions, hardened ground and polished. New Cleaning Compound SPECIALLY prepared, highly concentrated paste for cleaning dirt from paint, varnish, lacquer and 46 enameled surfaces has recently been placed on the market by the De Vilbiss Co., Toledo, O. This com- pound is in serhipaste form and may be used on both interior and ex- terior surfaces. Cold water from a 1-1 to a 10-1 proportion is used to dilute the prep- aration to the proper strength for the work to be done. It may be ap- plied by either a spray gun or a brush. After applying it is allowed to set for from five to 15 minutes and then is easily sponged or washed off with a hose. On an unusually dirty job the entire surface is brushed in order to loosen further © the dirt before washing. Grass, shrub and other vegetation which may be near the work are not af- fected by the compound. The compound is sold in one, five and 50-gallon containers. New Safety Grating NEW slotted floor plate has; been developed by the Central Iron & Steel Co., Harriburg, Pa. The new erating is the non-skid type and proof against slipping in any direc- tion. Because of its basic design, it requires no deep recess or rabbet in which to set. These. slotted floor plates can be furnished in almost any gage and size up to 72 x 240 inches and in addition to being non-skid, they al- low free ventilation, free drainage, passage of light and reduced weight. Tension Indicator Gives Quick Load Reading SIMPLE, light tension instru- ment for measuring the line loads on yard cranes, hoists. and standing rigging has been developed by the Martin-Decker Corp., Long Beach, Calif. The instrument may be applied to the line and the load read and removed in less than a minute. Provision is made for temperature adjustments when close accuracy is required. In operation the tension indicator is clamped directly on to the cable Span, measuring the load by the de- flection principle without dead-end- ing or taking up slack. A definite off-set is made in the line between two fixed points and the force re- quired to make or maintain this off- set is shown on the gage, a direct indication of the line load. It may be applied to the cable while already MARINE REvIEw—September, 1931 under load, prior to the application of the stresses, or during changes of the load, and will accurately reg- ister the tension at all times. Using a calibrated line, any pulling load may be measured. In construction the tension indi- eator comprises two adjustable clamps, one at each end, which brings the-line to a fixed stop. Be- tween these clamps a pressure plate Martin-Decker Tension Indicator is fitted with a projection which at- tains the line off-set. This pressure plate bears against a fiexible, canvas re-inforced rubber: diaphragm backed up by a body of fluid. The fiuid pressure generated is a_ positive measure of the force required to maintain the off-set in the line, and is indicated on the gage. It can be directly transposed into actual pounds tension on the cable. Produce New Finish ECENTLY there has been pro- duced by the E. I. du Pont de Nemours & Co., Philadelphia, a radi- cally new type of finish which pos- sesses remarkable durability and flexibility. This product, called Du- lux, has been developed through years of experimentation and trial by the company. Its marked depar- ture from the finishes hitherto used lies in the fact that it contains a synthetic vehicle which replaces the linseed oil commonly used in high grade paints. Interest in Dulux in the marine field is evident from reports received on the performance of the product as a finish for the hulls of niins, for painting the exteriors of super- structures and for all interior fin- ishing including the holds of ships.