Trap door sentence example
Trap-door nests are made by spiders belonging to two widely different groups, namely the Lycosidae or wolf-spiders, to which the true tarantula belongs, and the Mygalomorphae, containing the species which construct the best-known types of this style of burrow.
In the trap-door species of Lycosidae, like, for instance, Lycosa opifex of the Russian steppes, the hinge is weak and the lid of the burrow is kept normally shut by being very much thicker and heavier at its free margin opposite the hinge so that it readily falls by its own weight.
As a rule terrestrial spiders guard the cocoon in the permanent burrow, as in the trap-door spiders, or in the silken retreat which acts as a temporary nursery, as in the Salticidae.
For an account of the courtship and dancing of spiders, of their webs and floating lines, the reader is referred to the works of M'Cook (30) and the Peckhams (31), whilst an excellent account of the nests of trap-door spiders is given by Moggridge (32).
The female burrows in the epidermis much as the female trap-door spider burrows in turf in order to make a nest in which to rear her young.Advertisement
The outer larger plate in which the hole is cut is called the " guard plate," and must be kept at the same potential as the smaller inner or " trap-door plate."
There is a certain fixed guard disk B having a hole in it which is loosely occupied by an aluminium trap door plate, shielded by D and suspended on springs, so that its surface is parallel with that of the guard plate.
Their solution was the fitting of one of their hydraulic dampers; model HB 28 to every trap door.
The entrance to the crypt is currently through a trap door in a timber floor which otherwise obscures the steps of the entrance.
This was one where a portable loo was placed above the trap door below.Advertisement
A trap door would lead down to the ground floor storeroom.
All cast members who have to make an entrance or exit through the trap door were given time to practice in their costumes.
Bottom center - A trap door opens, a man steps out and stands beside it.
The nasopharynx and oropharynx merge into the larynx, which is protected by a trap door called the epiglottis.