We display a collection of the different types of antique Equal Arm Scales and Beam Balances: The simplest type with uniform beam suspended at its center and two pans of equal weight suspended at each end. Roberval scales with pans above the beam. Several modifications of Equal Arm Scales such as money scales, Gold silver and diamonds scales, Grocery and postal parcels scales,...
J.T Graham. In this book was incorporated the history of weighing, the principles of weighing and a...
Original 1930s lantern slides in original boxes VERY RARE. 3 boxes with two slides each and story leaflet....
The rapid development of electronics and computerization in the mid 20th century, and the invention of...
Received the package today - beautiful! My grandparents had purchased the postcards when traveling...