§12

Wittgenstein compares words to handles in a locomotive. They're comparable because words appear alike in print and handles appear alike - but this appearance disguises a variety of uses (one handle can be used to open a valve, one can be used to make the locomotive brake etc.). - Similarly the like appearance of words in print disguises a variety of uses. (Methodological point - Wittgenstein is again using analogy to bring our attention to the diversity of uses of words (and the fact that like-appearance in print disguises this))