The hour-glass, which was used to get the multiple for long distances, was of course the only portable time measurer available for Columbus.

These, with a rough knowledge of astronomy, and the taking of the altitude of the polar star, were the only known means for ascertaining the position of his ship at sea.
The first mishap occurred on Monday, August 6th, when the Pinta carried away her rudder.

The Pinta, it will be remembered, was commanded by Martin Alonso Pinzon, and was owned by Gomaz Rascon and Christoval Quintero, who had been at the bottom of some of the troubles ashore; and it was thought highly probable that these two rascals had something to do with the mishap, which they had engineered in the hope that their vessel would be left behind at the Canaries.

Martin Alonso, however, proved a man of resource, and rigged up a sort of steering gear with ropes.

There was a choppy sea, and Columbus could not bring his own vessel near enough to render any assistance, though he doubtless bawled his directions to Pinzon, and looked with a troubled eye on the commotion going on on board the Pinta.