762 
Report on the Trial of Railway- Waggons 
Fig. 1. — Longitudinal Section of Mann's Patent Waggon for Fresh 
Provisions. 
Fig. 2. — Side elevation of Mann's Patent Waggon for Fresh Provisions. 
to insure clean air, the latter is conducted into a filter-box, b, 
external to the waggon, filled with wood shavings (willow), 
which are kept moist bj the dropping of condensed water out 
of the tubes to be described. This water is collected in a 
trough, and from this trough it runs over on to the shavings. 
The air passes by copper tubes from the filter-box, right 
through the ice-chamber, crossing at the end and returning 
by tubes placed immediately above the first. These are shown 
at c, Fig. 4. It will be noticed by reference to Fig. 2, which 
