ae ae 
TRANSACTIONS OF THE SECTIONS. 185 
Instead of depending upon the operator for supporting and guiding the apparatus, 
it may be mounted upon a guide-bar or other form of carriage. The operator may 
also be assisted by sustaining part of the weight of the apparatus by a rope 
or chain. 
For riveting rows of holes at regular intervals, a stud-hook may be fitted so as 
to project in front of the machine, and, by entering an adjacent or advance hole, 
assist In supporting, as well as in guiding, the apparatus whilst in use. This stud- 
hook may be moved by a regulating screw, to adapt it for any required pitch of holes. 
Where it can be applied, a spring 
gauge-pin is adopted, forming at 
the same time a pin to gauge 
the pitch of the holes, and 
by locking into a spring-box, 
which contains a spring-dolly or 
“holder-up,” and being forced 
on the pin with considerable 
pressure, it becomes a support- 
ing bolster for the rivet-head, 
and forms amechanical “holder- 
up.” The pin which enters the 
rivet-hole may be attached to 
the riveting-cylinder with a 
moveable screw, and it may be 
cut as a ratchet, and lock into a 
spring-pall ; or the arrangement 
may be reversed, as the dolly 
spring-box or the spring-pin 
may be attached to the spring- 
box, and the socket and pall to 
the cylinder. 
The accompanying woodcut 
illustrates one arrangement of 
this apparatus when used for 
the purposes of riveting. 
In operating with the “steam- 
chipper,” the apparatus being 
provided with suitable handles, 
the operator grasping them 
brings the apparatus up to the 
surface to be chipped; and the 
steam being admitted, a succes- 
sion of rapid blows is given, 
and as the metal is chipped, the 
operator advances the appa- 
ratus. The chipper may be sup- 
ported on a sliding or other 
carriage, or by other suitable 
means, 
In heavy work, and where 
the diameter of cylinder and 
pressure of steam used are such 
that the amount of backward 
peer of the apparatus would 
é inconvenient for the opera- 
tor to support or withstand, a 
lanyard attached to the cylin- 
der may be carried to some con- 
venient point of attachment, 
in advance of the machine, so 
as partly to keep the apparatus 
