The modern type of lock, in which the key works on a pivot and moves the bolt backwards and forwards by a rotatory movement, after passing through a series of wards, was also known to the Romans. This is proved by the existence of several Roman keys solely adapted to a lock of this character (_e.g._, No. =444=; fig. 186_d_). Such keys are frequently found combined with finger-rings, a convenient method of lessening the danger of loss. We may conclude that this type of key was a favourite one for use with small padlocks. [Illustration: FIG. 187. ROMAN PADLOCK, WITH KEY RUSTED IN IT (NO. 445). Ca. 1:3.] [Illustration: FIG. 188.--ROMAN PADLOCKS (NOS. 446, 447). 1:1.] Padlocks of Roman date are common. In this Case three of a barrel form are shown. One (No. =445=; fig. 187) has the key still rusted in it. The padlock has traces of a chain attachment at one end, and was probably kept hanging to a doorpost, while the bolt was shot into the end link of a chain attached to the door. Two other Roman padlocks illustrated (fig. 188) are more ornamental in character. One (No. =446=) is in the form of a circular box with hinged handle, the free end of which was fastened by pin-bolts within the box. There is also a secret catch underneath. The other padlock (No. =447=) is furnished with a chain attached to one side of it. The last link of the free end was fastened inside the box, the lid of which was closed with a secret catch. The head on the cover is that of a Sphinx, a hint that the riddle of opening was not easy to solve. A hole in the floor of the box makes it probable that it was fastened to the object to be secured. [Illustration: FIG. 189.--BRONZE STRONG-BOX, WITH COVER SEEN ON INNER SIDE. _c_ AND _d_ EXPLAIN THE WORKING OF THE BOLT (NO. 450). 1:2.] Other objects deserving mention are the keys for raising latches (No. =448=; fig. 186_b_), and the combined ward and pin keys (No. =449=; fig. 186_e_), and also the very interesting Graeco-Roman bronze strong-box from Tarentum (No. =450=; fig. 189). The box (_a_) has a sliding lid (_b_), originally furnished on the inside with four separate fastenings. Two are horizontal bolts shot home by turning toothed discs from the outside; the third is the catch seen at the end, which was held fast in the slot by a pin-bolt (_c_). This bolt was moved by a disc on the outside of the cover, and was itself locked by the turning of another disc behind it; it could only be drawn back when the slot in that disc was brought into line with the bolt, as indicated in design _d_ of the figure. The small catch on the right at the end of the box fell into position automatically when the cover was closed, and could only be unfastened by turning the box on its side. The outside of the lid shows four similar circles, over which were the revolving or sliding discs now lost (fig. 190). [Illustration: FIG. 190.--COVER OF ABOVE STRONG-BOX (OUTER SIDE). 1:2.] [Illustration: FIG. 191.--SEALS AND SEAL-LOCKS (NOS. 452-4). 1:1.]