of concentrated liquid, or coffee base, every three
minutes. The dispenser automatically combines the coffee base with
boiling water in a differential faucet in the proportion desired,
usually one of base to four of water. The dispenser serves 600 cups per
hour. An additional faucet may be added which will double the capacity.

[Illustration: THE TRICOLETTE, A PAPER-FILTER DEVICE FOR A SINGLE CUP

Above; In position on cup--Below; opened, showing parts]

Among foreign coffee makers applying the French drip principle, the
Vienna coffee-making machine, known in the United States as the Bohemian
coffee pot, has met with much favor in this country. Elsewhere it is
known as the Carlsbad. It is made of china, and the European
manufacturer has a patent on the porcelain strainer, or grid, which is
provided with slits that are very fine on the inner side but that widen
on the outer side to permit careful straining and to facilitate
cleaning.

Some of the latest developments in coffee apparatus were shown at the
industrial exposition at the National Coffee Roasters Association, held
in New York, November 1-3, 1921. Among items of distinction not
heretofore included in this work, mention should be made of: an
American-French coffee biggin, being a French drip pot made of American
porcelain and fitted with a muslin strainer; a glass urn-liner, intended
to supplant the porcelain liner; and an electric repouring pump,
designed to be attached to any type of coffee urn.

Careful research of the records of the United States patent office
discloses that the number of patents relating to coffee apparatus and
coffee preparations, issued from 1789 to 1921, is as follows:

UNITED STATES COFFEE PATENTS

_Devices_ _Patents_
Coffee Mills 185
Coffee-roasting devices, and improvements thereon 312
Coffee-making devices 835
Coffee-cleaning, hulling, drying, polishing,
and plantation machinery in general 175
Miscellaneous patents (for coating, glazing, treated
coffees, substitutes, etc.) 300
________

Total 1,807

It must be borne in mind that there was a number of patents granted on
machines that were intended for, and used for, coffee, but that did not
mention