This is a set of eight "dropping sticks" used to teach acoustics. It was made in Paris by the famous scientific instrument maker Rudolph Koenig, sometime between 1858 and 1902. This particular set was used in the introductory physics class of the Worcester Polytechnic Institute. These s

Cast-iron toys are essentially American. Small foundries and factories were mass-producing them towards the close of the 19th century. These toys were sold in novelty stores, department stores, or mail order catalogs. One can follow along with shifts in technology by recognizing the changes in th