Starrett dial test indicator and accessories, housed in a fitted wooden box. The indicator has alternative buttons and two swinging arms as well as a tool post holder and a G clamp for mounting the instrument on a lathe or milling machine. It is missing a universal clamp for mounting the indicator on either the tool post holder or G clamp.
Verdict dial test indicator Pat. No. 468243 (patented in 1937, it was still made in the 1960s - see 1964 Buck & Hickman catalogue page 409). The Model A was priced in 1964 at £5 17s with universal holder and collet rod in a fitted case and at £4 17s 6d in a cardboard box. This is an early example reading .0005” over a range of .025”. The 1964 model A was graduated 0-15-0 whereas this example is graduated 0-25.
Ashcroft Thickness Gauge made by the Ashcroft Mfg Co New York. It measures to 1/1000th inch. The US patent date is May 28th 1912. In use the button is depressed to open the jaws and when released closes under spring pressure onto the work piece to give its thickness. The mechanism is similar to that of a dial test indicator. It has a press stud fastening leather pouch with the Ashcroft shield trade mark embossed on it.
“NIVOC” spherometer for measuring the curvature of spherically curved items such as lenses. NIVOC was the trade mark of Griffin & George and previously of George & Becker prior to their merger with Grifffin & Tatlock.
Two metric callipers and a small metric vernier calliper for inside and outside measurements. The left hand calliper is missing its spring. Obtained from Germany. Seen as obtained, the rust has since been cleaned off.
Orthops Slide Rule made by Raphaels Ltd, London for taking a series of measurements of the face and head to determine the sizes required for made to measure spectacle frames. It is made of celluloid and nickel silver. It is possible it was not actually made by Raphaels but made for them by Abbot Brown of Beaminster, Dorset.
Watkin clinometer by J Hicks, London. This instrument was used for measuring and laying out angles. The sensitive bubble level is held between pivots and connected to a lever which is held against the underside of the micrometer drum by a spring. The bronze frame has two surfaces at right angles enabling any slope between 0 and 90 degrees to be measured, between 45 and 90 being accomplished using the upright face and subtracting the angle read from 90 degrees. With it on the surface to be measured, the micrometer drum is rotated to bring the bubble to the centre of the tube. The angle is then read from the drum against the index mark on the collar. It is divided to five minutes of arc. Probably late 19th century. At that time Watkin clinometers were used by the military for checking the elevation of gun barrels.