HOW ENAMELED LETTERS ARE MADE.

The following is a description of a brief visit by a representative of

the _Journal of Decorative Art_ to the new factory of the Patent

Letter and Enamel Company, Ltd., situate in the East End of London.

The company have recently secured a large freehold plot in the center

of the East End of London, and have built for themselves a most

commodious and spacious factory, some hundreds of feet in length, all

on one floor, and commanded from one end by the manager's office, from

whence can be seen at a glance the entire premises.

The works are divided into two large compartments, and are lighted

from the roof, ample provision being made for ventilation, and

attention being given to those sanitary conditions which are, or

should be, imperative on all well managed establishments.

We first explore the stockroom. Here are stored the numerous dies, of

all sizes and shapes, which the company possess, varying in size from

half an inch to twelve or sixteen inches. Here, too, is kept the large

store of thin sheet copper out of which the letters are stamped. Our

readers are familiar with the form or principle upon which these

letters are made. It is simply a convex surface, the reverse side

being concave, and being fixed on to the glass or other material with

a white lead preparation. When these letters were first made, the

practice was to cut or stamp them out in flat copper, and then to

round or mould them by a second operation. Recent improvements in the

machinery, however, have dispensed with this dual process, and the

stamping and moulding is done in the one swift, sharp operation.

The process of making an enameled letter has four stages--stamping,

enameling, firing, and filing. There are other and subsequent

processes for elaborating, but those named are of the essence of the

transaction.

Scientific American Supplement, No. 841, February 13, 1892 · 第 37 / 62 题