For those following the 'guess what' thread here are a couple of images of the No 105 fuze as well as the 'fraction' view and a plate.
Fuze, Percussion, No 105 Mk I
Introduced under 'Confidential' cover by list of Changes 18035 7th Feb 1916.
This was the 'Boase' fuze, a graze fuze developed by the Design Department of the Trench
Warfare Department in December 1915. Its adoption was sanctioned early in February 1916
for use with the 1.57in and 2in trench mortars. Supplies began reaching troops early in March
1916 (History of Ministry of Munitions). It was later approved for use in the 9.45in Trench Mortar.
There were two patterns, 'B' and 'C, each with a Mark 1, a Mark 2 and a
Converted Mark 1. All were declared obsolete, by 19932 of February 1918.
Fuze, Percussion, No 105 Mk I
Introduced under 'Confidential' cover by list of Changes 18035 7th Feb 1916.
This was the 'Boase' fuze, a graze fuze developed by the Design Department of the Trench
Warfare Department in December 1915. Its adoption was sanctioned early in February 1916
for use with the 1.57in and 2in trench mortars. Supplies began reaching troops early in March
1916 (History of Ministry of Munitions). It was later approved for use in the 9.45in Trench Mortar.
There were two patterns, 'B' and 'C, each with a Mark 1, a Mark 2 and a
Converted Mark 1. All were declared obsolete, by 19932 of February 1918.