1851 Great Exhibition: Official Catalogue: Class VI.: Sandford, Owen and Watson
223. SANDFORD, OWEN, and WATSON, Phoenix Iron Works, Rotherham — Inventors, Designers, and Manufacturers.
Improved screw-cutting lathe, exhibited for simplicity of construction, and economy in working. The improvements consist in working the saddle, and throwing out the back gear of the fast headstock. The saddle is worked thus: the nut is solid with a spur wheel cast upon it, working into another spur wheel on a back shaft, on which there is a bevelled pinion; the latter works into a bevelled wheel, and is keyed on an upright shaft working through the saddle; there is another bevelled wheel, keyed upon the top of that shaft, working into a bevelled pinion upon the handle-shaft, which moves the saddle backward and forward at pleasure; in addition to this, there is an index disc upon the handle-shaft, which divides the screws into as many threads as are required, without interfering with the change wheels. The bevelled wheels on the saddle communicate motion to the screw in the saddle, which acts of itself transversely. The improvements in the fast headstock consist in a worm and wheel for throwing out the back gear.