Portable Agricultural Steam Engines at Newcastle. '/19 
hours, while that due to the Ash might with propriety, like 
the other items we have mentioned, have been deducted before 
setting up the Debtor side of the account. 
The other preventable losses may be some of those in the 
Unaccounted-for item. No. 10, but as we cannot point out what 
they are, we are not ashamed to confess we cannot suggest a 
remedy. 
There is one further point upon which we might touch, and 
that is, the desirability — with the object of saving the water- 
supply — of condensing the exhaust-steam. This, as is well 
known, is efficiently done in steam tram-car engines by air- 
condensers. It was done by Craddock nearly forty years ago, by 
a revolving air-condenser, and so efficiently as to produce a very 
appreciable vacuum, and it has been suggested to be done by 
the passage over the condenser of a stream of air to be directed 
on to the fire, so as not only to restore the water, but so as to 
get rid of some of the 4 '44 per cent, of loss arising under head 
No. 4 of our Balance-Sheet (the heating of the air). 
