Hope you enjoyed my previous instrucatble about drawing an instant camera. Let's continue with something much older.
Step 1: Follow These Steps.
This time I decided that comments are not necessary.
Step 3: And Now Some Excercises for the Reader.
Try to compose similar step-by-step guides for drawing these objects: enlarger and x-ray machine. And remember: a maker practicing good old hand drawing with perspective or axonometric projection as second hobby becomes a better maker.