The admission of steam must be regulated with the greatest nicety, so as to maintain an equable temperature, 208° to 210° F., hot enough to act upon the albumen and yet not enough to cause ebullition or disturbance in the juice, and so prevent a proper separation of the cachazas.
A strength such that there is a delay of 4 or 5 minutes before any effect is apparent will be found suitable, but no great nicety of adjustment is necessary.
But cylinder presses are now made so truly turned, and geared to such nicety, that this idea no longer prevails.
In using these machines there is seldom any question of determining the weight to any great nicety, and rapid action is generally of high importance.
Cylinders are now turned so truly and ground to such a nicety that very little packing is required between type and sheet to be impressed, so that a new system of making-ready, termed " hard-packing," has been resorted to.