[Illustration: SECTION THROUGH CACAO PRESS-POT AND RAM-PLATE.]
(_j_) _Breaking Down the Press Cake to Cocoa Powder._
The slabs of press-cake are so hard and tough that if one were banged on a man's head it would probably stun him. They are broken down in a crushing mill, the inside of which is as full of terrible teeth as a giant's mouth, until the fragments are small enough to grind on steel rollers.
As fineness is a very important quality of cocoa, the powder so obtained is very carefully sieved. This is effected by shaking the powder into an inclined rotating drum which is covered with silk gauze. In the cocoa which passes through this fine silk sieve, the average length of the individual particles is about 0.001 inch, whilst in first-class productions the size of the larger particles in the cocoa does not average more than 0.002 inch. Indeed, the cocoa powder is so fine that in spite of all precautions a certain amount always floats about in the air of sieving rooms, and covers everything with a brown film.
The cocoa powder is taken to the packing rooms. Here the tedious weighing by hand has been replaced by ingenious machines, which deliver with remarkable accuracy a definite weight of cocoa into the paper bag which lines the tin. The tins are then labelled and packed in cases ready for the grocer.
Since the great improvements of the steam engine, it is astonishing to what a variety of manufactures this useful machine has been applied: yet it does not a little excite our surprise that one is used for the trifling object of grinding chocolate.
It is, however, a fact, or at least, we are credibly informed, that Mr. Fry, of Bristol, has in his new manufactory one of these engines for the sole purpose of manufacturing chocolate and cocoa.
_Berrow's Worcester Journal,_ June 7th, 1798.
What I am about to write under this heading will only be of a general character. Those who require a more detailed exposition are referred to the standard works given at the end of the chapter. In these, full and accurate information will be found. The information published in modern Encyclopædias, etc., concerning the manufacture of chocolate is not always as reliable as one might expect. Thus it states in Jack's excellent _Reference Book_ (1914) that "Chocolate is made by the addition of water and sugar." The use of water in the manufacture of chocolate is contrary to all usual practice, so much so that great interest was aroused in the trade some years ago by the statement that water was being used by a firm in Germany.