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44 spindles are fitted with). bevels wheels, whichgear with similar ones fitted to a shafticarried at the top of thé revolv- ing framework. Motion from the:motor is transmitted. to this shaft by further ' gearing, which may be seen in Figs. 4,6 and 7. The screwed spindles which raise and lower the jib are provided with a counteracting turning move- ment, and are served by an electro- magnetically-worked band-brake. The control of the crane is effected from the driver's cabin, which is placed on the forward portion of the main platform staging. The outreach of the jib at any time can be read by the crane-man from a dial fitted with a pointer, which is in connection with the jib. Besides the switch apparatus, the driver's cabin is also fitted with a switchboard, with all the necessary safety and measuring apparatus. Thg metal resistances be- longing to the controllers are placed in a secondary cabin. The crane-framing is constructed ino iron latticework, and all cross-sections have been so chosen that they are al- ways easily accessible for painting. The stages are made with perforated plates. Ladders are provided for access to the various stages, and every part of the gearing can be reached without dan- | ger or inconvenience. All structural parts have been. made of mild steel. The toothed-wheels, as well as the -pressure-rollers, are made of cast steel, the teeth of the wheels being machine= cut where they run at high speed. Forged steel was used for the small pin- ions, the spindles, shafts, etc., while the material used for the worms was the best tool-steel. The worm-wheels consist of a cast core, round which a bronze ring or collar was shrunk. ; The 'casings used for the rope pul- leys are of fine-grained wrought iron. The ropes are of the best patent cast-steel wire, the active portion of which has a factor of safety of at least 8 against breakage. The diameters of 'the drums ate at least _ twenty- three times that of the ropes | that run on eee The bearings for fee first set of gearing are. ring lubricated, and the lubrication throughout the mechanism is well provided for, grease being gen- erally used. The following motors are employed: Two motors for turning the crane, each 12.5 horsepower, running at 500 revolutions per minute. One motor for lifting the load, 110 horsepower, ane 480 revolutions minute. _ One motor for tiking the. 'jib, 87 horsepower, at 500. revolutions per _ minute. _ lowest possible, TAE MARINE REVIEW With theses motors the working: speeds are as follows: Lifting the 150-ton load on Q the large hook..........:; So ft per min. Lifting the unloaded hook.. 8% Lifting the 50-ton load on the y small hook ...<. ar Ries a ; 1934 Lifting' the wunloade sma POOLE eh ant a ce eaies 30% When revolving the crane makes one complete revolution in from 5 to 7 minutes. ~ The derricking of the jib from the greatest to the smallest rake, with the suspended load, occupies from 10 to 1s minutes. | As already mentioned, the working | speeds when lifting small loads (with a -gentle wind blowing) are automatically adjusted to the higher speeds. The chief advantages claimed this crane are the following: 1. Having the turning column of the crane placed quite close to the quay for wall increases the effective outreach of the crane, which also gives an advan- tage in so far as the tipping moment is lessened thereby, further advantages accruing therefrom being that anchor- bracing (foundation bracing) tensions in the three foundations points of the supporting framing are reduced to the which results in the neccessity of only small. foundation blocks. 2. The supporting-frame of the crane does not obstruct general traffic un- der the crane on account: of .its open construction, and admits of three full- gauge railway tracks being made un- derneath. 3. "The three-legged support admits of an exact calculation of the stresses, and particularly admits of the various forces acting on the foundations, and so avoids waste of material in the foundations. _ 4. Any slight one-sided settlement in the foundations is without detri- mental effect. 5. The driving-gears are fixtures on the crane structure, and are arranged in an accessible manner. Great care has been taken to arrange so that a rapid exchange of spare parts can be made in case of wear and tear. 6. The' crane is. of great efficiency and utility for erecting work, because the jib is very narrow and can easily ply between the masts, funnels, etc., of vessels. - A The crane is independent of the height of the deck superstructures of vessels, because when the jib is de.- icked the crane revolves clear. apr & The slightest movements can be 'made with ease and exactness, particu- larly when fitting machinery or engine parts, and vertical movements can be _ executed true to a millitmetre by contractors, * icOasta: means of the luffing or dertickinig gear. The weight of the constructional | steel-work in the crane is 305 tons, and the counterweight weighs 162 tons. AROUND THE GREAT LAKES. Muir & Sullivan's dredge working © at the mouth of Black river sank last week in 18 ft. of water. The Leatham &-. Smith Wrecking Co. has. been awarded the contract to remove the sunken steamer Rose from the river at Manitowoc. The steamer W. B. Kerr now holds the ore and coal cargo records. She loaded 12,558 tons of coal at Lorain for Duluth and took on 400 tons of fuel in addition. The Hanna Dredging Co., Ogdens- burg, N. Y., was the successful bid- der to dig a straight channel from Boston to the sea. The amount in- volved was ~$3,000,000.00. The steamer Thomas F. Cole, be- longing to the fleet of the Pittsburg Steamship Co., carried 11,639 gross tons of ore to Conneaut last week, the largest single cargo ever. deliv- ered at that port. Capt. James A. Calbick, of Chicago, president of the Lumber Carriers' Association, is dangerously ill. In the absence of any bids from the government will do the work on the rubble mound break- waters to be built at Superior entry, Lake Superior. ° The 'wooden steamer Cartagena, which was recently. sold by Capt. James Davidson of Bay City, to Ches- brough Bros. of Boston, ran ashore at Half Moon Ledges, near Cape Sa- ble, Nova Scotia,: July 1s' She had un- dergone extensive "repairs at the Da- widson ve before leaving for the go Reports from Halifax are cee, but indicate that the vessel is broken in..two. .The crew reached shore, safely. .:,,- The Canadian steamer Batchawanna -was burned off Copper Point on the north shore of Lake Superior last week. The Batchawanna was formerly the propeller Robert A. Packer and was built by Wm. Crosthwaite. at Bay City in 1881: She was 290 ft. long, 64 {t. beam and: 16 ft.--6. in, deep. The crew succeeded in beach- ing the steamer at Copper Point but it is expected that she will . prove a total loss. She was carrying a car- go of ore to the Algoma Steel Co. at Sault Ste. Marie. The Cunatd Steamship. Co., it is stated, is shortly to invite tenders for the construction of two or three~ steamers of the type of the Carmania.