Chapter XX: =hand-Drilling and Boring Tools, and Devices.=

=The Brad-awl= 452
=Bits.= The gimlet bit 452
The German bit 452
The nail bit 452
The spoon bit 452
The nose bit 453
The auger bit 453
Cook's auger bit 453
Principles governing the shapes of the cutting edges of auger
bits 453
Auger bit for boring end grain wood 453
The centre bit 454
The expanding bit 454
=Drills.= Drill for stone 454
The fiddle drill 455
The fiddle drill with feeding device 455
Drill with cord and spring motion 455
Drill stock with spiral grooves 455
Drill brace 455
Drill brace with ratchet motion 456
Universal joint for drill brace 456
Drill brace with multiplying gear and ratchet motion 456
Breast drill with double gear 456
Drilling levers for blacksmiths 457
Drill cranks 457
Ratchet brace 457
Flexible shaft for driving drills 458
Drilling device for lock work 459
Hand drilling machine 459
=Slotting Machine= 459
Sectional view of 460
Tool holders 460, 461
Tools 461, 462