638 Report on the Trials of Combined Stacking-Macliines 
deserved bj an invention that promises to prevent the scarcity o£ 
hand labour from increasing the price of farm sacks. We have 
not thought it necessary to illustrate the machine, as in its 
general arrangement it resembles other sewing machines. If any 
reader wishes for fuller information, he must let us yield place 
mix dames, and leave him to gain it more pleasantly from other 
sources. 
Fig. 15. — Messrs, Bavey,^ Paxman, and Co.'s Apparatus for Heatincf 
Water in Tank of Traction Engine by the Exhaust- Steam, No. 5041. 
5041. Davey, Paxman, and Co. Apparatus for heating Water in Tank 
of Traction Engines hy Exhaust Steam. The position of this apparatus upon a 
traction engine is shown in Fig. 15, where the first point to be noticed is its 
compactness and the facility with which it can be fitted to any engine. 
The two waste quantities of water from the overfow of the pump and steam 
from the exhaust are here admirably utilised to secure a constant supply of 
hot water for the supply of the boiler ; thus saving fuel and lessening the 
wear and tear of the boiler, not only by preventing mechanical injury from 
the injection of cold water, but often also by lessening the chances of incrus- 
tation. Water that contains mineral impurities in solution will, when heated, 
deposit a portion of these impurities in the tank before it is required for use 
in the boiler. Fig. 16 is a section of the heater, and consists of three cham- 
bers, — the upper one filled with comjiressed air, the middle one with water, 
and the lowest with mixed steam and spray. The pipe on the left admits 
steam to the lowest chamber ; the pipe on the right carries water from the 
ovei-flow of the pump into the middle chamber. A brass disc, perforated 
