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Equipment Used Afloat and Ashore Quick Opening Air Valve—Automatic Sewage Expeller—Signal Apparatus —Are Welder—Recording Thermometer—Motor Driven Adjustable Saw HE mechanical details of a unique cs valve are shown in the accom- panying diagram. It is a quick open- ing and closing valve and is either full on or full off. It cannot be left partly open because the instant the cam is turned past center the pressure and spring close the valve, avoiding leakage of air. The cam action is the mechanical principle used and this up- down movement eliminates all friction at seat. The valve cannot be forced _. Phosphor B-orze Spring Murdock Q. O. CG. Air Valve or jammed at the seat, because the in- stant it is down on the seat the cam is disengaged, idle. It is closed and held tight by pressure. The spring is an auxiliary in case the valve is in- stalled in horizontal or diagonal posi- tions. The valve does not require re- grinding. The disc is standard and renewable and the gland or stuffing box can be repacked without taking the valve from the line or shutting off air. This product is known as the Q.0.C. air valve and is made by the Murdock Mfg. & Supply Co., Cincin- nati, O. NEW line of cleaning com- pounds, for use wherever there are cleaning problems, regardless of size or intensity, has been put out by the Cee-Bee Laboratories Ltd., Los Angeles. Automatic Sewage Expeller MONG the marine specialties de- vised and perfected by J. Stone & Co. Ltd., Deptford, England, and 40 now available to American shipowners direct from the American Locomotive Co., New York, is the Monoflow ex- peller, specially constructed for the expulsion of sewage. This expeller, shown in the accom- panying diagram, may be fitted at any convenient place below the waterline in any watertight compartment of a ship and is similar to an ash expeller. Connected to the expeller is an elec- trically-driven pump which provides the necessary power water. This pump draws from the sea and forces the sea water through the expeller, thereby setting up a high degree of vacuum in the main body of the expeller. The collector tank is so connected that owing to the vacuum mentioned the sewage is sucked in and absorbed by the stream from the pump and dis- charged clear of the ship under the waterline. The sewage does not pass through any pump and it is impossi- ble for seawater or any backflow to enter the sewage or sanitary pipes. The pump deals only with seawater which it turns into pressure water for setting up suction. : Operation of the expeller is entirely automatic, the floating piston being controlled by a flow through the noz- zle, and can only remain open as long as the expeller is efficiently discharg- Diagrammatic Section of Monoflow Sewage Expeller ~ ing. The moment the pump stops and the flow ceases, the pressure of the sea closes the automatic floating pis- ton and cuts off the communication from the sea to the tank. New Signal Apparatus Undergoes Tests alee practical demonstrations of the Janus broadcasting system given recently aboard vessels on the Pacific coast, prove the usefulness of this apparatus in avoiding collisions. This system gives the navigating of- ficer of a vessel the course of an ap- proaching vessel in relation to his own MarRINE REVIEw—March, 1932 course. The approximate bearing of another vessel can be ascertained by ear but the direction in which the other vessel is traveling is of the greatest importance. With the Janus apparatus this information is given with great accuracy, most of the sig- nals giving the exact course of the oth- er vessel, none being more than one point off. . In making tests, two vessels steamed in a quadrangular course in opposite directions, being one to two miles dis- tant. Several signals were given and received by each on the various courses. These signals were instantly transmitted by the receiver. Tests on Puget Sound proved that a_ ship equipped with the apparatus can auto- matically broadcast its course. There are three units in the mech- anism, a two-tone whistle, a broadcast- ing and receiving apparatus with three dials and a geared motor to control the whistle. ‘The course of an ap- proaching vessel. is automatically de- termined by measuring the intervals between two blasts from that ship. The system whistle is two-toned so that it will not be confused with the ordinary automatic signal. Four outstanding advantages claimed for the Janus system are that it com-- plies with the law requiring signals in fog; the signal goes from one pilot house to another without possibility of being garbled in transmission; the message is transmitted instantaneously and continuously and, because of the limited range of the whistle, there is less possibility of confusion in receiv- ing several signals at the same time. Captain Robert Kamdron, Seattle, and Capt. G. Stavrakov, Victoria, B. C., are the inventors. The Janus Mfg. Co. is located at 406 Lowman Bldg.,-Seattle. Broadcasting and Receiving Apparatus of the Janus System. A Whistle and reared Motor to Control the Whistle Also Are Included