Page:The Kinematics of Machinery.djvu/276

 254 KINEMATICS OF MACHINERY.

for instance we may use the following symbols for the forms named :

C+ Full cylinder, C~ Open cylinder,

S+ Screw spindle, S~ Nut,

K + Full cone, K~ open cone,

JT Plane cone (Cone having a vertex angle of 180.)

C Cylinder upon a general curvilinear base,

C + the same cylinder full,

C~ the same open,

P Prism upon a general curvilinear base.

We have chosen the symbol V for a vessel of any kind. By a suitable form-symbol we can make its meaning more definite in certain special cases, we can use V+ for the reciprocal of the vessel, that is, a body touching it all round upon its inner surface, so that V~ will stand for the vessel itself. V +, for instance, might represent a piston, V~ the cylinder in which it works.

Small letters similar to those of the class-symbols will also be used as form-symbols. They will be placed below and to the right of the former, and permit a distinct separation to be made between the forms of various elements, so as to shut out all meanings but the one intended. The following may serve as a few examples of this :

C z Cylindrical spur-wheel, and from it

Cf Spur-wheel with external teeth,

C^ Do. with internal teeth, or annular wheel,

K% Bevel wheel with external teeth, JT face wheel,*

H% Hyperboloidal toothed wheel.

HI Hyperboloidal face wheel,*

Cz Non-circular spur wheel with external teeth.

Pz Ptack.

C+ Cylindrical screw wheel.

T v Prismatic tension-organ, such as a flat belt.

Tp, Tp the same moving respectively towards or from its pulley.

T s Kope, T c wire, T z common chain, T r jointed chain.


 * See Der Constructeur, 3rd. ed. p. 435 and 451.