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'Drilling Machine--Magnetic Compa lator Cowl--Countersinking Ship APID and accurate drilling opera- tions on marine work require rigid machine tools that can be operated for long periods without interruptions for overhauling or re- pairs. For severe service, the ma- chine shown in the accompanying illustration was recently developed by the Defiance Machine Co., Defiance, O. The machine is a_ self-contained, electrically driven unit consisting of a column which carries the drill spindle, with its feeding mechanism, and a rigid knee which supports the platen. The column is bolted to a HEAVY DUTY DRILLING MACHINE base plate that also accommodates the motor bracket. , The spindle is 3%4 inches in diam- eter, made from a high-carbon steel forging and is provided with ball thrust bearings to eliminate wear. It is driven through the medium of helical-cut gears which have two keys through the driving sleeve into the spindle, located near the nose. This feature, it is pointed out, eliminates torsion in the spindle. The thrust of the keys and helical gears is taken by a substantial thrust bearing. The drive is a unit located in the back of the column. It consists of two cones of four gears each which tun idle except when one set is meshed by a roll-in gear. The gear cones are driven by back gears oper- ated. by a friction clutch which is located on the drive shaft. Four changes: of -feed* are provided. These are operated by means of two cones of gears controlled by a lever within convenient reach of the oper- ator when he is-in a working position. The power feed stop is obtained by a lever connected to a clutch on the work shaft. It is operated by an adjustable stop rod connected to the top of the spindle. The feed is trans- mitted to the spindle by a worm gear. Rapid traverse of the spindle is ob- tained by means of a pilot handle. The machine is entirely enclosed, permitting a gravity oiling system to be operated with a continuous flow of oil. The oil reservoir is in the bottom of the column. Oil is pumped to the top of the spindle and then flows to all bearings on the machine and back to the reservoir. Provision is made for the liberal use of cutting compound; A. tank, located in the column, is provided for this. The flow of lubricant is con- trolled by a pump equipped with a single valve near the outlet. The pump is also equipped with a relief valve. The knee is of the box type, having large bearings gibbed to the column. It has a vertical adjustment of 15 inches through the medium of a tele- scopic screw operated by a crank han- dle at the front of the machine. This screw is offset to allow boring bars to pass through the platen without obstruction. The platen has a working surface 1742x 35 inches. It has a longitudinal adjustment of 18 inches with a 9-inch cross feed. It is located in a saddle which traverses over the knee. The platen is provided with three T-slots running lengthwise while the outer edge forms a dam for confining lubricant, which is carried away by means of flexible piping. These ma- chines are also built. with a plain platen which has up and down adjust- ment only. The machine can be equipped with a tapping attachment which is an all- geared fixture located directly behind the main spindle drive Pedr. Tt ts operated through the medium of a lever which is connected to a jaw clutch between the forward and re- verse gear trains. The machine has a Capacity of 3- 360 ss--Scarfing Machine--Venti- Plates--Sheet ' Metal Cutter inch holes in steel, while the length of the power feed is 16 inches. The' spindle is equipped with a No. 5: Morse taper. The distance from the: center of the spindle to the column face is 12 inches while the maximum distance from the spindle nose to the platen is 32 inches. Magnetic Compass The compass shown in the accom- panying illustration is a type designed for use.on merchant vessels by Kelvin, Bottomley & Baird, Ltd. Glasgow, and supplied in this country by the Kelvin ren IT srs mpi nein TERE apres poss MAGNETIC COMPASS FOR MERCHANT SERVICE & Wilfrid O. White Co., Boston. This device is fitted with an azimuth mirror. The card is 10 inches in diameter and is designed on the Kelvin principle. It is said to be of light construction and is equipped with short needles of small magnetic movement which are suspended by silk threads from an aluminum ring. The azimuth mirror is fastened to the outer bezel ring around which it turns freely. It is securely fastened to pre- vent it being dislodged by accident or by the pitching and rolling of the vessel in heavy weather. The under part of the bowl is made of heavy annealed