Slide rule workshop T

Roberto's mystery slide rule

Metal slide rule

Click image for magnification

Data:

• G. Atkins, London
• Thermometer, Weight, Concentration in Pints, Concentration in Gallons

Questions:

1. any idea?
   The National Museum of American History has a hydrometer (item PH.330585) marked “G. Atkins Fenchurch Street London” with a wooden slide rule of a very peculiar design.
   According to the NMAH George Atkins was a mathematical instrument maker who had a shop on Fenchurch St. by 1804, and who later worked at other addresses.
   In 1815, George Atkins became a partner with Mr. Myles Brockbank, clockmaker. Andries de Man