Image shows a 'Glauser Mk.4' Liquid Prismatic Compass (click on thumbnail to enlarge).

For more information regarding compasses designed and manufactured by my late grandfather's company, J.M. Glauser & Sons Ltd., please click on the following link to 'Compassipedia: the Online Compass Museum' - an excellent site full of useful information: https://compassmuseum.com/hand/hand_2.htm#GLAUSER

My late father's book, 'Shakespeare's Cryptic Sonnets: An Interpretation', is now available to purchase online from Amazon UK (and The Great British Bookshop). I am grateful to YouCaxton Publications for their invaluable support throughout the whole process and delighted that they chose to publish the book under their own imprint, YouCaxton History - a great honour and a wonderful tribute. https://www.amazon.co.uk/Shakespeares-Cryptic-Sonnets-John-Glauser/dp/191442445X