Set 163
940. 6" long, patented in 1872, take a look at Neatorama for more guesses on this device:

941. A couple weeks ago I discovered these buildings near where I live, they were built for a particular purpose:


942. 38" long:


943. Approximately 5-1/2" long:



944. 8" long:


945. 12-7/8" long:


Answers
Last week's set is seen below, click here to view the entire post:

More discussion and comments on these photos can be found at the newsgroup rec.puzzles.