For large trees, a straight-back type of saw is preferable (1a) and for small to medium trees a hollow-back type.    From Wordnik.com.  [Chapter 6] Reference

Darling and Canning Downs, patches of Peel's Plains, and several remarkable points of the forest hills on that side, fully identifying this hollow-back with the pass discovered last year at the head of.    From Wordnik.com.  [The History of Australian Exploration from 1788 to 1888] Reference

"It being early in the afternoon, I sent one of my people (who, having been one of my party on that long tour, knew well the features of the country lying to the westward of the Dividing Range) to trace a series of forest ridges, which appeared to lead directly up to the foot of the hollow-back of the range.    From Wordnik.com.  [The History of Australian Exploration from 1788 to 1888] Reference