Jacob's staff

（重定向自Cross staff）

For the plant known as the ocotillo, sometimes called the Jacob's staff, see ocotillo.

The term Jacob's staff, also cross-staff, a ballastella, a fore-staff, or a balestilha, is used to refer to several things. This can lead to considerable confusion unless one clarifies the purpose for which the object was named. In its most basic form, a Jacob's staff is a stick or pole with length markings; most staffs are much more complicated than that, and usually contain a number of measurement and stabilization features. The two most frequent uses are:

单词	Cross staff
释义	Cross staff 英语百科 Jacob's staff （重定向自Cross staff） For the plant known as the ocotillo, sometimes called the Jacob's staff, see ocotillo. The term Jacob's staff, also cross-staff, a ballastella, a fore-staff, or a balestilha, is used to refer to several things. This can lead to considerable confusion unless one clarifies the purpose for which the object was named. In its most basic form, a Jacob's staff is a stick or pole with length markings; most staffs are much more complicated than that, and usually contain a number of measurement and stabilization features. The two most frequent uses are:
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