Domes
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Steam & Sand Domes

No 1 was a small Mogul with a small boiler.  The domes that came with the Aristo C-16 are too large for the boiler.  As David Fletcher suggested in the section on domes in Chapter 4 of SteamClass 2001, the Aristo sand dome was bashed into No 1's steam dome.  No 1's sand dome was built from scratch.

Steam Dome

These are the four parts of the Aristo c-16 steam dome bashed into a sand dome.  Brass parts came off the C-16.
The two styrene pieces were cut from a PVC pipe made for sink drains.  The flared portion allows sections of pipe to be joined together.  The pipe has an outside diameter of 1.25" while the flare has a diameter of 1.40".  Instructions on cutting and fitting these parts can be found in the chapter pointed to with the above link.
The four pieces are stacked on top of the boiler to test their fit and appearance.
As described below, the nipple at the top of the converted sand dome was removed with a razor saw.  It was replaced with a short piece of styrene tube and a small styrene strip.  Epoxy was used to glue the tube to the top of the dome and to fill the tube in preparation for installation of the whistle and pressure relief valves. 
Two pressure relief valves were fabricated from short pieces of 3/16" brass rod drilled for 3/32" rod.  The whistle was salvaged from the Aristo C-16.
   

 

Sand Dome

The top of the sand dome was fabricated from a brass door handle found at the local building products store.

A hack saw was used to slice the door handle into two pieces.  The base of the handle (left) will be bashed into the top part of the sand dome.
The nipple was cut off the converted C-16 sand dome to provide a Baldwin look to the scratch built sand dome for NPC No 1.
The neck of the sand dome base was filed own until the nipple could lie flat against a slightly larger diameter surface.  A touch of solder and we have a sand dome top with a Baldwin style.
This is a side profile of the sand dome top after the nipple has been soldered to the base of the door knob.

The base offers the added advantage of already being tapped for the screw that will secure the dome to the boiler. 
The steam dome was built from ABS plumbing tube, nylon washers, and the above top.
This shot shows the finished sand dome.  It was attached with a screw from inside the boiler through a hole in the top of the boiler.

An access hole was drilled in the bottom of the boiler to allow the screw to be reached with a screw driver.

The steam dome was attached in a similar manner.
 

(c) 2007 Iron Horse 1:29