Wooden Model of Screw Blade Form
Wooden model. One of three depicting forms from which the blades of Screws, in general, are obtained. Marked A.
Three models in Wood. Forms from which the blades of Screws, in general, are obtained. ( They are marked respectively A,B & C)
Wooden model. One of three depicting forms from which the blades of Screws, in general, are obtained. Marked A.
Wooden model. One of three depicting forms from which the blades of Screws, in general, are obtained. Marked C.