. Dairy chemistry: a practical handbook for dairy chemists and others having control of dairies. 184 THE CHEMICAL CONTROL OF THE DAIRY. The cord is now pulled back with the left hand keeping it quite loose—, letting the right hand go back quite freely. The pulling with the right hand is repeated, and continued till the speed is high enough. It is advisable to stop up the hole in the spindle, as it causes the cord to wear. Should the cord wear out and break, it can easily be replaced at an infinitesimal cost. This method of driving was worked out in the author's laboratory by Boseley and Ro
. Dairy chemistry: a practical handbook for dairy chemists and others having control of dairies. 184 THE CHEMICAL CONTROL OF THE DAIRY. The cord is now pulled back with the left hand keeping it quite loose—, letting the right hand go back quite freely. The pulling with the right hand is repeated, and continued till the speed is high enough. It is advisable to stop up the hole in the spindle, as it causes the cord to wear. Should the cord wear out and break, it can easily be replaced at an infinitesimal cost. This method of driving was worked out in the author's laboratory by Boseley and Rosier. The Lister Machine.—This has practically the same form as the Gaertner-Hugershoff machine, but does not include the " Excelsior " or " Rapid " gearings, which are covered by patents. The frame is of different construction and is S-shaped. Round the spindle a small brass pulley is fixed * (in the 24-bottle machine a ratchet is added), and it is driven by a string wound round this by Boseley and Rosier's method, which, how- ever, was independently applied bv Lister (Fig. 13). It has the following advantages over the Gaertner - Hugershoff machine:— (1) Lower frame and, therefore, less vibration. (2) Better metal used for bearings; therefore lasts longer. (3) Is easier to drive. The 2-bottle machine has the arms hinged, and clamped in place by a screw, instead of having them in one piece ; it is more easily portable. Apparatus, &c—1. The acido-butyrometer is a glass vessel closed by an india-rubber cork, and with a graduated neck divided into ninety divisions; one division <H per cent. fat. Every tenth division is longer than the others, and the inter- mediate fifth divisions are also slightly lengthened to facilitate reading. * In practice it i^ better t" take off tliis pulley, stop up the bob, and drive on the spindle direct. The machines bavealso been made without the Big. 13.—The Lister Please note that these im
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