Fig. 29.
In [Fig. 29] I have given a practical method of arranging one to be worked either way as desired. A is the pump, B the eccentric on main-shaft to work it by steam power; but when requiring to work the pump by hand, you have only to push up hook connection at C, which disconnects it from eccentric, and then by working the handle D, which is screwed into bottom of plunger C, the water is forced into boiler.
This pump is a little more troublesome to make, as it requires an extra stuffing-box at F, but it is very neat and useful, and the handle lying quite out of the way, does not spoil the appearance of the model.
G is the exhaust water-pipe bent up to the back pressure-valve on boiler, and H the supply-pipe carried on to rear of engine.
You will find two small blow-off cocks on each cylinder very handy to get rid of the condensed steam when starting the engine with cold cylinders, as without them the cylinders get choked, and you stand a good chance of getting scalded by the hot water being thrown up the chimney with considerable force.
The blow-off cocks can be connected with a tye-rod, and both worked from the foot-plate by a single handle.
The parts being all finished to your satisfaction, you should paint the bed-plate black, and side frames red, and when dry carefully line them black and white, and also pick out the rivets with black.
Of course individual taste has a great deal to do with the finish of a model, so I will leave it to you, merely suggesting you should get a fine lining tool to finish with, and when all is complete put it aside to dry whilst we proceed to build the boiler.
This will require the greatest care, but with due attention you will be able to turn it out well. Some sheet copper will be required one-eighth of an inch thick, and although this is more expensive than iron, it does not rust, and is more suitable for the work in hand.
