Boiler fronts are made in many different styles, almost every maker having some peculiar points in design that he uses on his own boilers and which nobody else uses.

In the illustrations here given may be seen the four principal designs:

1. The flush front is shown in [Fig. 72.]

2. The overhanging front as seen in [Fig. 73.]

3. The cutaway front, [Fig. 74.]

4. Fronts with breaching as shown in [Fig. 75.]

The flush front is one of the earliest forms of fronts, and though it often gives good satisfaction, yet it is liable to certain accidents.

Front for Water Tube Boiler.—Fig. 71.