Patterns for Casting a Steam Whistle

Here is a pattern that I ran across in an old book, and it details how to use retracts (retractable pattern pieces) to make a mold for a steam whistle.

Its an interesting mental exercise for me to understand how it works.
I had to read it a number of times to figure out what the process was (this was before I started making patterns; it makes much more sense now).

When I get a bit of time, I will cast one of these.

 

Thanks for posting that Pat. When I get some time to read slowly (maybe tonight) I want to read through that. Interesting enough there is an article in Home Shop Machinist magazine this month, on making steam/air whistles. I've been wanting to pick up that copy to make one (30 miles away).

Thought it sounded like a neat machining project ... now maybe a neat foundry & machining project.

 

If it's as loud as a train horn, I want one! The goal is to give the dogs next door heart attacks! Barking problem solved!