[Answer] 1. Next is our diorama of agricultural technology of 19th century North America. I see lots of equipment, but wait, there is something out of place, something that had not been invented yet. What is it?

Step 1 : Introduction to the question "1. Next is our diorama of agricultural technology of 19th century North America. I see lots of equipment, but wait, there is something out of place, something that had not been invented yet. What is it?"

...1. Self-propelled combine harvester 2. Wooden grain shovel 3. Oxen yoke 4. Scotch (iron-spiked) harrow I shall have to speak to the conservator about this one! A combine harvester is so called because it combines reaping, threshing, and winnowing of grain--usually wheat, oats, rye, barley, corn (maize), soy, or flax. In the 19th century combines were drawn by mules or horses, then later by tractors; self-propulsion using gasoline (petrol) or diesel engines didn't appear until the twentieth century. Grain shovels were wooden because farmers in the early nineteenth century feared that metal would bruise the seed. The Scotch harrow tilled and smoothed the soil to prepare for plowing and planting. By the turn of the twentieth century the disk harrow had supplanted the iron-spiked harrow. The oxen yoke was simply a curved bar with u-shaped wood bows slid under each ox's neck. Horses eventually replaced oxen as the favored work animal before plowing and harvesting became completely mechanized in the twentieth century.

Step 2 : Answer to the question "1. Next is our diorama of agricultural technology of 19th century North America. I see lots of equipment, but wait, there is something out of place, something that had not been invented yet. What is it?"

Self-propelled combine harvester:

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