Seller: alaboutantiqes (476) 100%, Location: Aboyne, Ships to: GB & many other countries, Item: 223230139615 This listing is for a precision device to show Newtons rings and was made by Philip Harris of Birmingham. It appears to be in good all round used condition measuring 9.5 cm. in diameter and standing 3.5 cm. high. Please see photographs for a visual inspection of condition and please ask questions. As with all old items there will be signs of use and wear we try to point out any significant problems that we are able to establish but we are not experts so if you have specific concerns please get in touch. For items that sell for over £50 I prefer to insure for the selling price with the buyers agreement for the benefit of both parties.