|A crop of the 1897 "Road May of the Albany - Troy District showing Bethlehem. (New York Public Library)|Molten metal is poured into the mold at the Meneely Bell Foundry of Troy. There is a fascinating video on YouTube showing the casting process and the use of molding sand.
https://www.youtube.com/watch?v=3yWbVoTmLJo Search on Meneely Bell Foundry if the link doesn't work. The image here is from the website http://bells.danmeneely.com.
If you are like me and like trolling the inter-webs for old photos, be sure to visit the New York Public Library's digital collection. They seem to add to it daily. Search under Albany County, N.Y. and lots of good stuff will pop up.
Also if you have molding sand stories or pictures - please share!