Improvement in Ceramic Manufacture, ere, ยฐ51 16 Ind. h. p. per lineal foot of boiler frontage. This leads up to the important question of the utilization of the steam, which the ]ate M~:. Robert Stephenson defined as its '~administration," and fuller information is yet needed as to the comparative advantage of working steam on the compound or single-cylinder principle; also as to the value of steam-jackets, as well as with regard to the initial and terminal pressures most conducive to economy. These inquiries, though full of interest, cannot be entered, upon in the present paper; but one of the essentials to economy is the power of raising high-pressure steam steadily and safely, and this may be accomplished by the use of the Lancashire boiler.
At least 300 or 400 boilers have been made, of similar construction and equipment to that described in thisp'/per; and among others it may be mentioned that a series of four such boilers can be seen at the Houses of Parliament, employed for heating and ventilating, which were laid down in the year 18(;9 by Mr. Joseph Clayton of Preston, who was one of the first to assist in carrying out the views of the writer in getting up a first-class boiler equipment for the service of the members of the Manchester Steam Users' Association.