The 1868 patent, No. 1239, was entitled “Improvements in the Construction and Erection of Buildings used for Horticultural or other similar Purposes, and in Machinery or Apparatus employed therein”.
Figure 3 from 1868 patent showing the apex of the roof with ridge cap and ventilating lights with iron saddle, king rod, and the upper portion of tension rods as fixed to the saddle.
Figure shows a section of upright front and a portion of the roof with sill, iron muntins with carrier for the ventilating apparatus, and the light bracket for straining wires, the lug to carry the upright ventilating light with the bracket to receive the tension rod, and the thrust principal cast upon it with the ventilating light open, and the arm opening for the same with longitudinal plate, a portion of the rafter with tension rod and thrust principal.
Figure 6 from Thomas Messenger’s 1868 patent No. 2139, showing tension rod support (F) carrying tension rod (R) and screwed into rafter (B).
The patent appears to be the first time that the term “muntin” has been used in relation to horticultural buildings:-
If the building or structure is required to be perfectly plain, whether in form or lean-to span or semi-span roofed structure consisting of upright sides and straight roof, it is formed by fixing iron or other bracket-headed “muntins” upon sills, as before mentioned, upon which “muntins” rest a small wood or other longitudinal plate: and also the feet of the wood, iron, or other rafters forming the roof. To these iron or other muntins are secured or cast on, so as to form part of same, the required brackets, bearers, or supports for ventilating or other apparatus as before mentioned. The ventilating apparatus in this case would be so arranged as to open the upright front light, and a similar one at the apex of roof opening the entire length of building at once, and either together or separately, as may be desired; or the upright light and the whole of the roofing may be made to open in a circular manner.