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July, 1919 THE MARINE REVIEW 361 DOUBLE-HEAD SHIP PLATE SCARFING MACHINE WITH ADJUSTABLE TABLE AND ELECTRIC DRIVE--THE HEADS CARRYING THE CUTTING TOOLS AND DRIVING MECHANISM ARE ADJUSTABLE ALONG THE BED TO ACCOMMODATE PLATES OF VARIOUS WIDTHS glass. It is claimed that this member is as little liable to breakage as a metal bottom. The under part of the bowl contains oil which serves as a steadying medium when the ship is in motion. The bezel is conical shaped and is graduated in degrees on each side from 0 to 180. It is pointed out that this feature is. useful for 4-point bearings. The compass is illuminated from un- derneath. The electric lamp used for this purpose is placed at a sufficient distance under the bowl to prevent the possibility of compass errors due to close proximity of the lamp. Two oil lamps are also used to project the light upward to the compass. A mechanical light regulator is installed to permit the electric light being shaded. Among several well-known vessels equipped with this compass are the MaAuRETANIA, Lusrrania, ADRIATIC, CELTIC, KENIL- wortH CASTLE and the MARMorA. Ship Plate Scarfing Machine Recent shipbuilding activities have resulted in the design of many special tools for shipyard work. Among these is the ship-plate -scarfing machine shown in the accompanying illustra- tion. This machine was developed by the Hilles & Jones Co., Wilmington, Del., and works on the draw-cut shaper principle and is designed to cut scarfs on both ends of a plate simul- taneously. It is built in different lengths to provide for accommodating plates from 7 to 10 feet wide. The work table is provided with four T-slots to facilitate bolting the work in place. This table is provided: with an angular adjustment so that angles for scarfs of various lengths can read- ily be machined. The table is ad- justed by two square-thread screws located at each front corner. The screws are rotated through the medium of hand wheels. The two heads which carry the cut-. ting mechanism are adjustable along the machine bed to accommodate plates of various widths. These heads 'are adjusted by means of hand wheels,' cK ELECTRICALLY WELDED VENTILATOR COWL while a power feed is provided for imparting an automatic feed for each tool when in operation. The heads carrying the cutting tools are actuated' by means of a crank and pitman mo- tion which is adjustable for different lengths.» The cutting: tools have a stroke varying from 6 to 19 inches and are provided with a quick return. This is _accomplished through the medium of elliptical gearing. A lever is pro- vided for throwing the cutting tools out of gear while the machine is run- ning. Each elliptical gear is fitted with a clutch. The machine' is driven by a 15- horsepower motor of adjustable speed. The cutting speed is variable from 9 to 18 strokes per minute. The varia- tion of speed is controlled by the speed of the motor. It is said that the draw-cut action, which starts the cut away from the edge of the plate drawing down to a feather edge if de- sired, operates without any tendency to buckle the plate. A number of these machines are in operation in various shipbuilding plants. Ventilator Cowl With the object of reducing skin friction as much as possible and of securing easy manipulation, the Ohio Blower Co., Cleveland, recently devel- oped the installation shown in the ac- companying illustration. The design of the cowl differs radically from time- honored practice due to the fact that this member is made of plates running vertically instead of radially. This fea- ture, it is pointed out, reduces skin friction and eliminates any pockets where moisture might collect. The sec- tions of the cowl are joined by electric welding. The turning gear, which is operated from below deck according to approved practice, is placed comparatively high, i