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70 CARGO MARINE IRON WORKS HOISTS. It would be difficult to devise a handier or more compact steam winch than the one here illustrated, a num- of which have been built ber this THE Marine REVIEW The Marine Iron Works, Chicago, also build a smaller size steam hoist of similar design which are very use- ful on the small and medium size commercial boats and are suitable for wharfing, raising anchor, hoisting car- MARINE IRON WORKS CARGO HOIST. season by the Marine Iron Works, Chicago, mostly for Pacific coast ves- sels. These hoists or winches are made exceptionally strong and intended for hard usage; are always ready for work, easily operated and being under perfect control by the lever to the steam reverse cylinder, are not com- plicated by the addition of a brake. Their, double engines (usually 7 x 8) are fitted with balanced piston valves and reverse cyinder with the same kind of valve. The connecting pipes between cylinders are heavy gage cop- per with substantial brass flanges, forged connections, steel and semi- steel "herring-bone" gears and a stout shield. The drum shaft is. ground to 4 in. and the engine shaft to 3 in. diameter. The fittings for each hoist include lubricator, oil cups and wrenches. A good job all the way through--second to none. They are usually made and sold in pairs-- right and left. Each of these hoists occupies a deck space of 38 in. by 75 in.; extreme width over warping drum 7 ft. 3 in.; extreme height 4% ft.; weight each, 5,400 lbs. They are built to order only. winter, oy reliable tarpaulin and other covering as part of the ship equipment, should interest the owner and master to no little extent. The day of the painted hatch covering, with its cracked and leaking skin, has almost passed away, and waterproof canvas is now used extensively in the construction of tar- paulins, hatch and boat covers, and the like. It is only in the last few years that absolutely reliable waterproof can- vas has been manufactured, and the uses to which such a canvas can be applied aboardship and around freight wharfs are ntmerous. Wilford's waterproof cloth, of which Edward A. Bunker, New York, is sole agent for fhee. United «States; and Canada, 1S made of pure twisted flax thread, and: has proven itself singularly adapted to rough usage and exposure. It is much stronger and more durable than cotton, and, unlike many of the so-called waterproof canvases, is of light weight and easily handled. The fact that such concerns as the Standard Oil Co., the Bush Terminal Co., the Central Railroad of New Jer- sey, and other large corporations, in addition to many of the shipping companies, have adopted the Wilford waterproof canvas, speaks fon the merits of the article. Amongst re- cent orders filled for this waterproof canvas covers may be mentioned six large made by Louis Martin, sail- SECTIONAL DRAWING OF SMALL HOIST. go and other miscellaneous duty which the small vessels referred to are so often called on to do. Steel is used in the construction of these hoists to a greater extent than usual on such work in order to insure strength and wearing qualities within reasonable weight and space tions, limita- WATERPROOF CANVAS. With the sudden arrival of what is going to prove a long and the question of severe providing maker of New York, for Pennsylva- nia railroad lighters. CONSTRUCTION WORK. Specifications have been issued by the bureau of yards and docks of the navy department inviting bids for the completion of the dry dock at Brook- lyn, N. Y., the contract for which was recently forfeited by Secretary Met- calf, owing to the failure of the con- tractor to finish the About $800,000 is available. work.