26 APARIBE BEMIEW REVIEW. [April 4, A NEW BI-POLAR STURTEVANT MOTOR. employed in making the shart The are ape ne the oa toothed drum type, the coils being wound in slots insulated in a most thor-— for ae te ee i tae a SPECS. adenied ough manner. The commutator is built eee ey forged segments of Boston, Mass., has gradually been led into the manufacture of the same ra lake COD eae composition shel dhe ance | general type as independent motors. They, of course, possess the nyaerent ie ae darated with an insulating compound and baked at a tem- feature of great range of speed due to the bi-polar design. In the accom- perature of from 150° to 175°. This renders the armature oil and water panying illustration is shown a special arrangement of one of these ma- 2 1 proof and prevents any liability of a breakdown. chines, which are built in small sizes, ranging from 4% to 5 H.P. The fold Gils ae of data ble cation cerca wire, which, after Bal subjected to the same dipping and baking as the armature, are carefully 5 covered with micanite paper and heavy tape. This is in turn given an ‘ : _external finish of oil and waterproof paint. Carbon brushes only are used, mounted in a socket type of holder, and provided with every facility of adjustment. Ordinarily these motors are furnished with V slide rails in all sizes except the 4 and %, but when it is desired to attach the motor to wall or ceiling and have provision for tightening the belt, a special sliding base is furnished. These motors at standard speeds can be wound to any volt- age up to 600 and will carry their full rated load for ten hours with a temperature rise not exceeding 40° F. above that of the surrounding air, and without sparking. Evidently motors with these provisions for ad- justment can be used equally well for the floor, wall or ceiling. SUGGESTION REGARDING SAULT RIVER FOG. In a letter to Capt. Geo. P. McKay of the Lake Carriers’ Association, Commander J. C. Wilson, inspector of the eleventh light-house district, says: “Referring to the characteristic of the fog signal at Detour light sta- tion, I am informed by the keeper of that station that frequently vessels \ lie for hours in calm weather in a streak of thick fog, when it can be seen from the station that the weather is perfectly clear up the river. The keeper suggests using a special signal, such as three long blasts, to indi- cate this fact, so that vessels approaching the river may take advantage of it if they deem it desirable. This suggestion strikes me as being a good one, but before adopting it I would be glad to have the opinion of vessel men on the subject.” The matter will have the attention of the Cleveland ‘members of the Ship Masters’ Association at their next meeting. The frame or magnet ring is usually of cast steel to support the arma- ture bearing cradle. The stand or base is an entirely separate casting, in It is both interesting and instructive to-note the gradual growth of which the motor is placed and secured by set screws. Evidently the the ocean liner. In the year 1881 the largest steamer in the world was the motor itself may therefore be turned to any angle, while the bearing City of Berlin, now the Meade of the United States transport service. She cradle is maintained in a horizontal position. The bearings are of the is 520 ft. long and has a displacement of 8,000 tons. In 1891 the City of ring-oiling, self-aligning type, the bearing sleeves being made of hard Paris, 560 ft. long and about 16,000 tons displacement, was the largest composition. This feature of having both bearings mounted in one and in the world. In 1901 the largest vessel in the world will be the Celtic of the same casting insures absolutely perfect alignment, while this feature the White Star line, 700 ft. long and having a displacement of 36,000 tons. combined with the ring-oiling, self-adjustment design insures the mini- Who can tell the size of the vessel of 1911? It will not do to hazard a mum friction resulting from ‘rotation of the armature. Crucible steel is guess. “Little Giant” PNEUMATIC TOOLS have won and are every day winning through performances, not promises. Their strong hold on the favor of good mechanics lies in the fact that they never disappoint. Our “Little Giant” Piston Air Drill has repeatedly demonstrated its superiority in competitive tests. It is the only Piston Air Drill having a double-balanced Piston Valve cutting off at 5% or full stroke, and it does its full duty on 50 per cent. less air than is required by rotary or other makes of air drills. It has no vibration, can be run in a bath of oil and will work very close to a corner, ONE HOUR'S TRIAL np TK ~ | “Little Giant” Pneumatic Hammers 2"¢ made in seven sizes—a size is better than a thousand testi- for every service. They save -monials. We offer a 30 days’ fully 30 per cent. in air over ordinary pneumatic hammers, because they have free trial of any ‘‘Little Giant’’ a regulator which lets in the air exactly as it’s wanted, and because they Tool you may select—you sim- cushion on the exhaust instead of on live air. ‘Little Giant’ Long Stroke ply send it back if you don't Hammers drive rivets perfectly up to 1 inch without jarring the operator. want it and we ‘‘pay the | This hammer has only three moving parts—less than any other long stroke freight” both ways. hammer in the business. Ask for Catalog “E” and study it for profit. STANDARD PNEUMATIC TOOL COMPANY, MANUFACTURERS OF ALL KINDS OF PNEUMATIC TOOLS AND APPLIANCES. Main Offices, Marquette Building, CHICAGO, ILL. NEW YORK OFFICE, 141 BROADWAY. ‘Little Giant’’ Drill in Close Quarters. MADE: IN SIX SIZES.