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notice the security gained by the use of the very small diame-I calculated as being equal to 20 men. As is claimed for all tel' of the long-stroke cylinders and the short length of short-our coal-cutters, a great saving is effected by the quantity of stroke cylinders. They are made of steel. and their forms large coal brought down, that by the machine being fully enable the production of cylinders of maximum strength. Cast I two-thirds large, against half coal and half burgee by hand, irondoi:10.1038/scientificamerican03091878-1810csupp fatcat:bxnqc43pbzfnfaa3airpkj5the