Our first calculator to meet the requirements of air defence. Purchased from the UK in the mid-1930s as a calculator for the heavy 76 mm Vickers anti-aircraft cannons that were acquired at the same time.

SPECIFICATIONS:

• lateral advance: 40 degrees
• vertical advance: 13 degrees
• altitude: 7000 m
• weight: 270 kg
• weight of base: 61 kg

Vickers calculators were used in 5 different types, each one for a different cannon type:

• Vickers Va 76 ItK/28 B and 76 ItK/29 B
• Vickers Vb 76 ItK/27 BK
• Vickers Vc 76 ItK/34 V
• Vickers VI and VIA 76 ItK/16 V

The model of the device exhibited is Vickers Vb.

References: Vehviläinen Raimo et al., Itsenäisen Suomen Ilmatorjuntatykit 1917–2000, Sotamuseo, Helsinki 2005; Palmu Pentti, Yön yli päivään – Suomen ilmatorjunnan vaiheita 1925–1990, Ilmatorjuntaupseeriyhdistys Ry, Helsinki 1989; Ilmatorjuntajoukot 1925–1960, Ilmatorjuntaupseeriyhdistys Ry, Helsinki 1963