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Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
Crossbow bolts can be fitted with a variety of heads, some with sickle-shaped heads to cut rope or rigging; but the most common today is a four-sided point called a quarrel. A highly specialized type of bolt is employed to collect blubber biopsy samples used in biology research.
The source actually says Zhuge invented a multiple bolt crossbow that could shoot ten iron bolts simultaneously, each 20 cm (7.9 in) long. [44] In 759 AD, Li Quan described a type of multiple bolt crossbow capable of destroying ramparts and city towers: The arcuballista is a crossbow of a strength of 12 dan, mounted on a wheeled frame.
The bolt has a relatively short bolt throw and features rear-mounted lugs, and the bolt operating handle places the bolt knob just rearwards of the trigger at a favourable ergonomic position close to the operator's hand. The action features helical locking surfaces (the technical term is interrupted threading).
Mechanically, it was laid out approximately like the Mauser original, but without the removable lock frame. Internal parts (trigger, hammer, safety lever, etc.) pivoted on pins and screws extending through the frame. The screws also held the frame together. The bolt was of round cross-section, unlike the square Mauser bolt.
A cow with antlers atop a power line pole. Wikipedia contains other images and articles that are similarly shocking or udderly amoosing.. Of the over six million articles in the English Wikipedia there are some articles that Wikipedians have identified as being somewhat unusual.
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