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56 of water circulation. Baffle plates are used to deflect the flow of air and aid in its effectual contact with the cool- ing tubes. This method reduces the air temperature between stages to ap- proximately the original temperature and tends to reduce the final or dis- charge temperature and also the horsepower required for a given ca- pacity. The nest of cooling tubes may be removed intact from the in- ter-cooler box without disturbing any of the piping. The inter-cooler is supplied with a pop safety valve, pressure gage and drain valve. The belt-driven machines are pro- vided with an unloading device, which automatically unloads the air cylinder. When a predetermined pressure is reached in the receiver, one or more inlet valves at 'both ends of the cyl- inder are held open and the load is taken off of the compressor, allowing it to run light until the pressure drops in the receiver, upon which the valves are released and compression resumed. On the steam machines, a combined speed and pressure governor is used, which unloads the air exactly the same as on a belt-driven machine, and, at the same time, controls the speed, allowing a single steam machine to just turn over when unloaded and bringing a duplex or compound ma- chine to a dead stop. The steam cylinder and valve gear of the steam-driven machines give a high efficiency with slight attention. A plain balanced D slide valve is used on the small and medium sized machines, while a Meyer balanced ad- justalble cut-off valve is employed on the larger machines. The steam cyl- inders are lagged with mineral wool. On all steam-driven machines the gov- ernor is equipped with a safety stop device, which will stop the machine, if the governor belt breaks. The cross head is a new type box pattern of semi-steel. The shoes are adjustable and have large bearing sur- faces. Side bearings allow easy ac- cess to the cross head shoe binder 'bolts. The-cross head pin is fitted to tapered seats in the cross head, drawn tight on the tapers by means of a nut held in position by a pin. The con- necting rod is of the marine type, and is adjustable at the cross head end by means of a split box. The crank pin end is adjusted by removable tin liners. The crank shaft is forged from a solid billet of open-hearth steel, and in case of a duplex shaft, the portion in the center is enlarged to accommodate the heavy flywheel. The compressors are built in sizes ranging from 8-inch stroke up to and THe Marine Review including 16-inch stroke, and give a range of capacity of 79 cubic feet of free air per minute up to 1,200 cubic feet. ------ THE "MILE ROCK" LIGHT STA- TION. The comparatively new lighthouse station which guards the southern en- trance to the great harbor of San Francisco, though really only a third- order light, is one of the most impor- tant of the number that protect the port of the Golden City. This station is located a short distance west of the famous Golden Gate line and three- eighths of a mile north from "Land's End" on the southern shore. Direct- ly north of "'Mile Rock" station-- MILE ROCK LIGHT STATION. about three miles distant--is located the first order light station on North Head. The light displayed by the lat- ter is a clear, steady white, while that on "Mile Rock" is a steady, brilliant red. These two lights beacon the en- tire western, southern and northern sweep of:.the ocean for a radius of more than 12 miles--beyond the light ship "San Francisco No. 76," which lies anchored eight miles off (west) of the entrance to the bay. These two light stations are the only sentinels which guard and pro- tect the entire and immense commerce of San Francisco, both inbound and outward bound. For a distance of more than three miles the southern coast line of the entrance is thickly strewn with sharp, ragged rocks, many of which are en- tirel hidden during high tide. This is a very dangerous and treacherous stretch, and the principal purpose of the "Mile Rock" station is to warn all vessels, bound in and out, against these perils. All mariners, navigators, and mas- ters of vessels consider the faithful little pharos one of the most impor- tant beacons that guard San Francis- co's commerce. The construction of this station was a wonderful piece of engineering, Originally the foundation was only a very sharp pinnacle of bare, worn rock. By means of concrete, a huge iron cylinder, and steel structural frame - work, the foundation has been mass- ively anchored to the immovable rock. From the mean ocean level the steel tower rises 100 ft. The light is vis- ible for a distance of more than nine miles. Owing to the great engineering dif- ficulties, as well as the dangers, more than one year was required in the con- struction of the station. The light was first displayed early in December, 1905. At the time of the great earth- quake it was feared the whole tower would topple over into the sea, but it stood as firmly as the rock of Gibral- tar. In November, 1906, San Fran- cisco experienced the most terrific gale ever known in all the history of the port. This wind storm lasted over 12 hours, attaining a velocity at times of more than 80 miles per hour. To all' this fearful sweep of the gale, the lit- tle station was fully exposed, but it withstood the fury of the blast with- out the least indication of yielding. The total cost of the station was $100,000. The grand lodge meeting of the Licensed Tugmen's Protective As- sociation will be held at Toledo Jan. 19. E. F. Kemmet and Michael Mc- Donough will represent the Cleveland lodge. The following were elected of- ficers by the Cleveland lodge: E. F. Kemmet, vice president; Fred Carroll, corresponding secretary; Willis Brown, financial secretary and Joseph Normand, trustee; J. C. Ryan, chaplain. Bruce & Co., Seattle, Woash., have been awarded contract for the con- struction of a 500-yd. hopper deck barge for Seattle owners, to be 115 it, long, 36 ft. beam and 12 ft. deep, She is designed by S. M. Gage, who thas been very successful with similar craft 'on the Sound. treasurer, _